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Bunding – Oil Filled Transformers, To Bund or Not to Bund?

Transformer Bunds | Bunds for oil-filled transformers manufactured from steelwork on reduced lead time and at competitive prices from Thorne & Derrick | Contact us with your requirements | Stock, Service & Product Support

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Thorne & Derrick can provide design and manufacturing services for Transformer Bunds with optional oil filters, drain valves, filter systems and ancillaries in both mild and galvanised steel (painted or unpainted) – innovative, efficient, safe and cost-effective solution for protection against leakages of insulating liquid to BS EN 61936-1:2010.

BS EN 61936-1:2010

Power Installations Exceeding 1kV a.c. Common Rules

Oil Filled Transformers

Guest Contribution: Carl A. Watkin IMEMME (Hons) I.Eng MIMMM MIET AIOSH

Carl has over 40 years experience as a Projects Director, Electrical Engineer & Project Manager in the highly regulated HSE HID hazardous and heavy industry sectors – this includes global ATEX and IECEx hazardous environment and area industries, civil tunnelling, LV MV HV utility sectors and the renewables sector.

In this original post from LinkedIn, the business and employment-oriented social media network, Carl discusses transformer bunds with gathered opinions from industry peers featured in the thread of comments below.

Bunding – Oil Filled Transformers

To Bund or Not To Bund?

by Carl A. Watkin

Question to all my fine Engineering contacts regarding oil filled distribution transformers – transformers are exempt from the UK oil storage regulations, as they are oil using (cooling) rather than storing, unless they have a conservator, holding in excess of 201lts, connected by single pipe – I see many transformer installs, including DNO installations, that do not have bunds around the transformers.

See: BundGuards | Substation & Transformer Oil Spills & Leaks Containment

What are your thoughts on bunding, or not, of oil filled transformers? What criteria would you use to assess whether to bund, or not?

➡ Neil Denbow (Director at Eden Transformer Oil). For distribution transformers yes you can but the process should be carried out by an accredited MIDEL Service Partner (we were the first). For power transformers yes but with referral to M&I Materials. There have been many successful retrofills around the world – MIDEL 7131

Contact Applied Power Engineering

➡ Manuel Bolotinha (Electrical Engineer). Usually sealed distribution transformers up to 630-800 kVA don’t need to be bunded.

➡ Neil Denbow (Director at Eden Transformer Oil). Manuel, BS EN 61936-1:2010 doesn’t differentiate between breathing and hermetically sealed transformers, it is defined by the volume of oil in the transformer.

➡ (Richard Emery IEng MIET MIHEEM Authorising Engineer (E) IHEEM AE(E) at Green Building Design Consultants). I get the transformer bunding problem, and even if you don’t have an oil storage problem, and the environment agency have incorrect information there is the risk assessment? Is a spillage going to cause secondary contamination, disruption and damage? How do we deal with external transformers/ bunding and rain water? I have seen some bunded walls with 300mm of water in them others with drain taps left on.

➡ Neil Denbow (Director at Eden Transformer Oil). Richard, larger 11kV transformers will have oil/water separation systems, smaller transformers will have valve with a oil/water capture filter that allows water to pass through but trap oil. We sell the latter on our website www.edenoil.co.uk and have a partner for the lager systems:- When a bund has not been maintained or doesn’t have filter system, we offer a bund emptying service.

➡ Dan James Technical Services Engineer (HV Senior Authorised Person at NG Bailey). We’ve put in from full on concrete swimming pools, active filters to perspex shields around the rads to stop fluid spraying past the bund. Most of the time midel is used these days which doesn’t have the same environmental issues, a bund with a filter seems to be what we do most though.

➡ Neil Denbow (Director at Eden Transformer Oil). Dan, you are right that MIDEL is readily biodegradable but BS EN 61936-1:2010 doesn’t differentiate between oil, synthetic or natural esters. However, insurance companies do.

➡ Craig Davies Senior Electrical Engineer – (Navitas Engineering Ltd) This has been debated many times in the Rail industry. With respect to Environmental Agency website error, certain parties in Rail industry have received same letter from Environmental Agency but certain representatives contradict each other in their response.

➡ Derrick Stableford P.Tech.(Eng.) (Electrical, Instrumentation and Controls Designer at Associated Engineering). Funny I had a containment question at work this week. Sorbweb matting would be my answer for leak control. Most trannys at this level have level switches as options, the hard part is the comms back to the control centre, without creating a cyber security intrusion risk. The sorbweb Mat adsorbs oil, and repels water. No need for a shed. Using food grade oil will also help with environmental risks. You could fry your lunch with a drawn off sample, or bang it in your diesel. The bunding and double wall systems have their own cost adders and maintenance issues, Inc water pump outs and disposal. Mechanical separators can freeze and fail, esp. here at severely minus temps.

➡ Craig Davies Senior Electrical Engineer – (Navitas Engineering Ltd). Thank you and I’ll have to research sorbweb matting.

Contact Applied Power Engineering

➡ Tony Haggis Director (Tony Haggis Consulting Ltd). Hazard control should follow the hierarchy: 1. Eliminate the hazard 2. Reduce the hazard 3. Control the hazard 4. PPE.
Pole transformers are not ‘reasonably practicable” to protect using HV fuses, particularly for LV side faults. Effective bunding is impossible. The most difficult zone is the tails from transformer to LV fuses. UK DNOs generally use double insulated single core cables fitted with plastic cleats and fixed to a wooden pole. LV fuses are single phase plastic units seperated 300mm apart, again, fixed to a wood pole. Phase to phase and earth faults are virtually impossible. Lightning takes out a lot of pole transformers causing them to explode oil over an area greater than any bund could catch. Again, the root cause is now well understood. A lightning induced flash over on the HV bushing causes the transformer tank to rise to more than 50kV. However, the LV winding is earthed separately from the HV earth and so the tank back flashes to the LV windings which fails resulting in a permanent LV side fault and transformer burnout. A simple 6kV lightning arrester fitted between the LV neutral and tank combined with a specified LV BIL (Basic Impulse Level) of 30 kV eliminates the problem. Also attention to LV fuse sizes and LV network look impedance significantly reduces burnouts due to uncleared LV faults.

➡ Karl R (Functional Safety & Systems Engineer). Watch out for an error in the HSE publicised “Hierarchy of Controls” leaflet. The vitally important area of physical isolation was missed. The hierarchy is actually: 1 Eliminate – do it a different way that doesn’t use the hazardous methods or substances. There’s no risk if there’s no hazard. No need to mitigate for a non existent hazard. Save effort, money and time for use elsewhere. 2 Substitute – use something non/less hazardous 3 Isolation – Physical separation. Barriers, bunds, locked areas and vessel containment. Dual layers. 4 Design – Automation, control, monitor, report and safely shutdown/reroute. Engineered solutions to mitigate hazardous situations and prevent hazardous material release. Control and safety systems to look after the process. Switchgear protection. 5 Admin – Enforcement and training. Emergency Response Procedures. Authorised areas, Competency, Risk Assessments, Design Reviews, Method Statements, verification and validation, maintenance, etc. 6 PPE

➡ Dale Smallshaw Managing Director (CRITICAL ELECTRICAL SOLUTIONS LIMITED) There’s a regulation in the 18th edition where it covers transformers containing oil shall be bunded or pitted to distinguish any potential fires

➡ Nick Hill, MIET  Senior Authorised Person (SAP) / Service Engineer at ABB BS7671 only covers 1000v ac. So effectively half the transformer needs to be bunded. The HV side can do what it wants 😂

➡ Benjamin Alsbury HV Commissioning Technician (Industrial Switchgear Services Ltd). How can a bund extinguish a fire/potential fire? Fire triangle…it doesn’t remove either of the three

➡ Rob Lamb HV Field Engineer (UK Power Networks). Benjamin, just the environment argument

➡ Martin Kempler (Estimator). It’s a containment issue in case of fire or contamination. Landfill tax on hazardous waste is punitive

Contact Applied Power Engineering

➡ Rob Lamb HV Field Engineer (UK Power Networks). Benjamin, I think they are looking at the possibility of directing fixed extinguishing systems at the transformer bund area where the fire would be centralised.

➡ Martin Kempler (Estimator). Exactly. Though you might need an interceptor on the drain just in case of a spill washing through

➡ Benjamin Alsbury HV Commissioning Technician (Industrial Switchgear Services Ltd). Rob ah right! Good point!

➡ Richard Emery IEng MIET MIHEEM Authorising Engineer (E) IHEEM AE(E) at Green Building Design Consultants. Its a cooling medium. The oil circulates around the core and out to radiators on the sides, so aiding the cooling of the transformer core

➡ Dan James Technical Services Engineer (HV Senior Authorised Person at NG Bailey) Richard, it also aids insulation, soaking into the craft paper and filling air gaps

➡ Gordon Wilson (Contracts Manager). I would bund to 110per cent

➡ Neil Denbow (Director at Eden Transformer Oil). BS EN 61936-1:2010 species the options available eg two transformers can share one bund.

See: BundGuards | Substation & Transformer Oil Spills & Leaks Containment

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Eden Transformer Oils

Eden Transformer Oil Ltd was formed by Alan Denbow and Eddie Gregory in August 1985.

Former employees of Burmah Castrol, they realised that the vast majority of electrical engineers were simply replacing expensive transformer oil without fully appreciating the additional technical benefits of purification to the electrical equipment that Eden could achieve using a more convenient solution at a significantly lower cost.

In more recent years the treatment of transformer oil is the first choice for a cost effective and efficient maintenance program: the increasing cost of new oil, the importance of productivity and equipment downtime, coupled with the environmental benefits of avoiding the transportation of hazardous waste and use of virgin products, are all part of the equation – this applies to medium/high voltage (MV-HV) applications distributing electrical power at 11kV, 33kV and up to 66kV.

Since August 1985 Eden have been testing and maintaining the insulating liquids in transformers and switchgear in the United Kingdom, Belgium, France and Germany.

Eden provides end-to-end MV HV services and products to maintain transformer oil, MIDEL 7131 and silicon insulating liquid. On their webpage “Why Maintain Oil”, they highlight how Eden can provide a safe, economical and environmentally sound solution to maintaining transformers.

Whether you are an end user, Electrical Engineering Company, Facilities Manager or Senior Authorised Person, Eden will be able to assist you in the testing and maintenance of your liquid insulated electrical equipment for LV (Low), MV (Medium) and HV (High Voltage) applications up to 66kV.

➡ Carl A. Watkin thanks Gordon – would you bund all transformers regardless? I agree with earlier posting that bunding should be considered following a suitable and sufficient risk assessment based on many factors – from experience, there are more unbunded than bunded

➡ Graham White Founder (Power Balancing Services). I think one other point that relates to PAH is the need for a thorough maintenance programme including annual oil sampling. My experience in the embedded power generation world is that transformer maintenance is very poor. My view is that without a thorough maintenance programme you have more than an environmental issue, you have a serious H&S issue. In short don’t let PAH build up in the oil.

➡ James Hoare LHW Partnership (Electrical & Energy Engineers). Would agree in PV. Seen 1000 kva standard distribution transformers connected to 1000 kva inverters which generate a sine wave with a level of harmonic content which should necessitate derating of transformer. The peak duty of transformer is when sun is out and ambient temp high , and will spend ( in uk) months far lower than peak output . As PV is cyclic the air / moisture content will cycle day and night so have to be a higher risk of premature failure – cast resin are in many ways better for inverter fed systems as the ones with foil windings cope better with heat rise from harmonics as more surface area on winding – a lot have gone into operation with little attention to lifetime longevity and I would argue a transformer with good maintenance correctly sized should last a long time.

➡ Neil Denbow (Director at Eden Transformer Oil). I certainly agree with that Graham. We see the good the bad and the ugly. We offer inspect, sampling and analysis services.

James, solar farm transformers do get a harder life than some sites and not all are up to the job Yesterday we analysed and reported on 46 Routine and DGA samples for one O&M (various sites and manufacturers), of the 46 transformers 12 had issues. I wouldn’t expect to see that fail rate at factories, offices, hospitals etc.

➡ James Hoare LHW Partnership (Electrical & Energy Engineers). Does not surprise me one bit,and agree – the good news is an O&Ms  are spending some ££ on routine sampling etc. We used to make £1000s and the transformer failure rate was almost zero, even the cast resins which at the time were new technology. 

➡ Matthew Pilgrim Senior Consultant Engineer (FM Global). Carl, in general transformer bunding is a good idea, but can be a costly exercise for existing installations. Factors to consider are: the cost and lead time of the transformer, its impact on production, whether an oil fire would expose adjacent transformers or buildings and the type of oil used (mineral oil, natural or synthetic esters). Environmental impacts are also important. FM Global has a fairly comprehensive standard on transformer installations that you can freely download from our website.

➡ Andrew Hawley Group MD, CMBC CEF Chair, RICS Trainer. Depends on circumstances & client budget (sadly!).. always try transformer bund if budget allows, only essential if installing in sensitive or enclosed areas, for example – an oil filled Tx caged in the corner of an underground car park should be bunded but in a wide open space with no potential for contamination of other equipment or the environment, bund if budget allows. Also consider the quality of the transformer and in all cases ensure a proper maintenance regime is in place.

➡ Neil Denbow (Director at Eden Transformer Oil). Andrew, transformer bunds are essential if you are going to follow British Standard BS EN 61936-1:2010. They aren’t very expensive in the scheme of things and can be retrofitted.

➡ Neil Denbow (Director at Eden Transformer Oil). Transformers in service are not storage tanks and so not applicable to these regulations (the Environment Agency website is wrong and they have confirmed that in an email to me but over a year later have not changed their text). However, page 69 of BS EN 61936-1:2010 (titled Power installations exceeding 1 kV a.c. Common rules) is applicable and that states transformers holding more than 1,000 litres need secondary containment. Of course bunds can be retrofitted. Please see my post last year https://www.linkedin.com/feed/update/urn:li:activity:6336239479648514048/ I hope that is helpful.

➡ Philip Fenwick Contract manager (Qualified). Why can’t the heat from these oil filled transformers be used and or sold onto premises close by, this would then make these more environmentally friendly and spread the costs.

➡ Carl A. Watkin. Philip, they don’t get that hot in normal use so heat recovery would be minimal (not like a CHP unit), but that’s not to say it could never be considered for some application.

➡ Philip Fenwick Contract manager (Qualified). Carl, I except your answer and better knowledge but one would still think/conceder it a possibility to use the heat given off of the generator to give a start to warming water prior to going into a boiler making it cost less to bring the water to the temperature required, I just think in these times when we are trying to save energy and make things more cost effective it could be looked at.

➡ Karl R. (Functional Safety & Systems Engineer). The heat given off from these transformers is no more than 50C normally. Some large factories have sub stations and transformers inside, so heat would benefit the building. Most often these transformers and their isolation switches are outside, for various practical reasons.

➡ James Hoare LHW Partnership (Electrical & Energy Engineers). What a great idea !! I Infra Red tested a Cast resin Tx on a PV farm  in December and core was 85oC. I think this was made pre the EU directive on losses coming into force, but I do Heat pump work  and is a valid innovation as the conversion ratio of a GSHP is 3 to 4, so as the core losses are 24/7 and in a demand  location, heat of 60ºC could probably be efficiently collected by extracting 20ºC heat via a heat exchanger and efficiency would improve the hotter the oil temp . The Fe/core loss will be mainly heat, so what a great way to recycle the lost energy. Assume a flow and return input / output on transformer tank and a pump  to Heat pump compressor unit.  I think justifying costs would be the hurdle as a bit niche, and amorphous core transformers are getting cheaper and cheaper so the market is probably better for retro.

➡ Peter Thomas (Grid Connection Engineer Renewables). For smaller distribution transformers of which there are many tens of thousands installed over the last 50+ years it’s a matter of asset and risk / management. It’s generally true that none are bunded as failures are rare to the point of being insignificant. If otherwise there would be public concern. And what about pole mounted transformers? They are more likely to experience failure due to overloading. Comments?

➡ James Hoare LHW Partnership (Electrical & Energy Engineers). Most pole mounts historically are DNO owned and there is DNO fuse protection on DNO point of connection with customer – largest pole mount in Uk is 315 KVA?

➡ Peter Thomas (Grid Connection Engineer for Renewables). James, yes that’s about it. 200kVA is normally the max size at 11 kV. However the failures are more likely to occur on old 5kVA single phase units which are often overloaded if the LV fuse has been incorrectly oversized which can and does occur. Many years ago I went to one failure in Snowdonia where it had burnt out. Only to discover it had over 30 kW of industrial fan heater attached which were used to warm up a climbing group after a climb! Needless to say we sorted it out.

➡ Neil Probert (Electrical Power Engineer to 66kV). Only for transformers that are under specified, aluminium wound and designed to fail

➡ Carl A. Watkin. If they are under specified Neil, they shouldn’t be installed, never mind bunded!

➡ Andy Beckton (Electrician). Double tank transformers like they double hull oil tankers-no need for a bund then-fit a level switch, then if it leaks-repair it!

➡ Carl A. Watkin. Might double skinning then create over temperature problems Andy?

➡ Graham WhiteFounder (Power Balancing Services). This should answer the question. https://www.gov.uk/guidance/storing-oil-at-a-home-or-business#generators-and-transformers

➡ Neil Denbow (Director at Eden Transformer Oil). Graham, that is the web page that the Environment Agency has confirmed will be corrected to match British Standards. So far it has only taken them one year.

➡ Andy Ledward MSc MIET (Project Manager). Good question Carl. My experience is DNO tend not to bund their Distribution Transformers (Primary and Transmission yes). However (& forgive me if the policy has changed in some way) if you were to submit a design with a bund then this would be outside of the adopting DNO standard and would need to be approved as a special case, plus the cost to maintain etc. So I stand to be corrected if I am wrong, but this is an additional factor to consider as well as the environmental one.

➡ Robert Copley Midel (M&I Materials Limited). Retro fitting bunding is difficult on an installation like this and expensive. As an alternative you could retro-fill with MIDEL 7131 which is Biodegradable and fire safe, this is a lower cost option while increasing the performance, lifetime, safety of the transformer and also helping to protect the environment at the same time! Something Neil and his team at Eden have done many times already.

➡ Alan Guiver MIDGTEDirector (Agren Power and Energy Ltd and Agren Inspection Services). Bund them. I’ve always bunded transformers, and on one build on an existing concrete slab we used pre manufactured bund trays for 2.5Mva units, complete with rainwater / oil separator drains. De contamination costs run into many thousands if you have an issue- and leaking transformer oil spreads like you wouldn’t believe.

➡ Derrick Stableford P.Tech.(Eng.) (Electrical, Instrumentation and Controls Designer at Associated Engineering). We have a similar issue over here, in Canada. However our clients near rivers use food grade oil, Canola based. Also I’ve recently come across some adsorbent mats that repell water, but adsorb the oil. These are covered is some gravel, so the clean up costs become nominal in an event of spills. , and no oil/water separator is needed. They even work at negative temps. The only issue with the food grade oil, is that if energising at say -20c you need to warm the core, for a day or 2 so the unit doesn’t trip out on start up.

➡ David Pinning BEng (Hons) (Open) IEng MIET (Palm Paper Ltd). Carl, excellent post. We have fully bunded 132/20kV 63MVA units on site (ours, not DNO). Our bund system serves two purposes. Of course to contain the entire quantity of oil of one unit + excess for rainwater etc. for environmental protection. Secondly we pipe away the bunds to an underground fire quenching pit designed to both minimise secondary fire damage and permit a credible chance of extinguishing a transformer fire!

➡ Marcus HoldenManaging Director (Torus Engineering Ltd). We cover both Power Generation and contaminated land.  If transformer oils still contain PAH’s – as they used to on the sites we have tested, the answer is a no brainer – bund them every time.  The clean up costs on Poly Aromatic Hydrocarbons is extremely expensive as Alan has already mentioned.  PAH’s are particularly nasty and can spread like wildfire through surface water transmission.

➡ Muhammad Mushtaq Vohra (MSc Energy Management and Conservation at Middlesex University London). That’s true. Transformer above 1000kVA needs bunding.

➡ James Hoare LHW Partnership (Electrical & Energy Engineers). Old school BS171 transformers are pretty robust – some of the not quite so robust welded fin units I’ve seen on PV farms built to a cost are showing plenty of rust / Galvanic corrosion? already – agree with earlier post “ build a bund” Many PV inverters are transformer less so some dc content – will be interesting over the years the impact

➡ Catherine Falconer Commercial Contracts Manager at (Scottish&Southern Electricity Networks). Something regularly discussed within DNOs….

➡ Mark Rowcroft Technical Manager (Banks Renewables). I’d want to see a bund regardless. Minimal cost consideration but of huge benefit should you ever need it.

➡ Norm Bowdler Contractor (VTAC Technical / AJ Video). Something to ponder, when a xfmr failure does occur is it always associated with a fire, buncefield was a total disaster as the bunds failed due to the mastic gaps melting between the concreted sections.

➡ Damian Flood FES (ABB Ltd). Well good practice would be to always bund an oil filled transformer. I would always recommend using a transformer oil with higher flash point Midel or FR3 also where the budget allows.

➡ Martin Mathiasen Senior HV Technician, Transformer Specialist (Present Group). Hazard vs Risk and Consequence. Although the risk is low the consequence of hundreds if not thousands of litres to ground does warrant a suitable control measure. Bunding and directed pressure relief systems are the most suitable system of control. (In my opinion).

➡ Raja Ratnam General Manager Construction, Minerals & Metals (Schenck Process Australia) From my point of view, transformer oil is never good to have risk of going into waterways – through drains or spread by stormwater. Also good fire containment with bunds. The risk is too great.

➡ Jason Rowley Director (Jason Rowley LTD). I had a project with a DNO similar to the picture above where on the weekend after they dropped it on site a nice local decided to empty the transformer oil and steal 3 copper washers from it. (It was an aluminium core) The clean up cost over £60K as we had to excavate nearly 4 meters to remove the contaminated ground then rebuild the whole compound again. Project was quoted at £20,000. I would pay an extra £1000 for a bund if I ever do another.

➡ David Davenport CEng. MIET Technical Sales/Field Consultant/Advisor (Critical Energy Management, Switchgear, Protection and Control). Of course not to be confused, ( as many do) with instrumentation, metering and/or protection VT’s which ‘should’ if designed and built correctly remain at ambient temperatures, ( unless under fault conditions) Work as well in oil or cast resin insulate material. Cast resin though can significantly reduce insurance premiums, so much so, some companies have replaced old oil VT’s to cast resin and this has been paid for with the first years premium reduction. More info available if you message me?

➡ Nigel Tongue. Bunded concrete pit with the TX on raised plinth in the centre. The correct type of gravel surrounding it. Tube installed so you can see the bund bottom and pump out rain water. Historically that’s how we install.

➡ Craig O’Neill #e5 supporter, Technical Director at Completely Electrical UK and Electrical Trainer (Steve Willis training Ltd). That’s how I was taught! Belts and braces essentially because cleaning it up is something noone wants at all!!! Mega pricey nowadays.

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Applied Power Engineering

Applied Power Engineering are a highly experienced power generation solutions business, using industry leading products.

APE aim to provide their clients with comprehensive solutions and support, this support package may be as simple as design and commissioning services through to a full design and build power plant.

APE “care” and in order to satisfy your needs they “listen” ; APE listens to how your business operates, listen to your concerns with regards to the implementation process, and liaises with third parties as part of their duties or in support of you directly.

APE aim is to solve your problems and reassure you about the implementation process.

Contact Applied Power Engineering Tel: 08456 52 54 54

Visit: Applied Power Engineering

Thorne & Derrick stock and supply the DrainEezy range of transformer bund filters for use with LV MV HV Oil-Filled Transformers providing passive, self-regulating environmental protection and preventing bunds from overflowing during rainfall events; the DrainEezy Bund Filter System is field-ready to fit and retrofittable allowing clean water to drain freely while automatically blocking and retaining insulating oil in the event of a leak or catastrophic transformer failure.

600/1000V | 11kV | 33kV | 66kV Transformer Bund Filters

Lucy Zodion Titan2 Street Lighting Cut Outs – Single & Double Pole

• Uploaded By - Chris Dodds (Thorne & Derrick Sales & Marketing Manager)

Street Lighting Cut Outs

Lucy Zodion Ltd, are the leading UK manufacturer of street lighting cut-outs, controls, feeder pillars and street lighting isolators – their street light cut outs (SLCOs) are also part of the G81 specification framework.

Lucy Zodion Titan2 cut outs are supplied as standard with features that ensure the street lighting technicians task is considerably easier.

The Lucy Titan2 cam lever handle enables effortless release of the Lucy fuse carrier in one movement and there is plenty of cabling space to terminate a wide variety of conductor types and sizes.

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Lucy Zodion Titan2

Street Lighting Cut Outs Range

• Single or double pole cut outs
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• Brass or insulated gland plate options
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Street lighting Cut Outs – Titan2

TITAN2 SINGLE & DOUBLE POLE CUT OUTS

PRODUCT SPECIFICATION

Should you require any technical support and advise in order to select the correct street lighting cut out please do not hesitate to contact us.

Lucy Cut Out Part No	Fuseways	Components	Description	Cable Entry	Image
Titan2 (NT06) double pole single fuse cut out, complete with earth block, and brass plate with:
THM0006032	1	2 x 20mm grommets	NT06-TT-NG12
THM0010170	1	2 x BW20 brass glands	NT06-TT-NG18
THM0010121	1	2 x 20mm tubes	NT06-TT-NG25
THM0031147	1	2 x 25mm tubes	NT06-TT-NG26
Titan2 (NT06) double pole single fuse cut out, complete with earth block, small extension trough, and brass plate with :
THM0010657	1	2 x 20mm grommets	NT06-TT-NEF-NG12
THM0017257	1	2 x 20mm grommets	NT06-TT-NEF-NG13
THM0013678	1	2 x BW20 brass glands	NT06-TT-NEF-NG18
THM0010211	1	2 x 20mm tubes	NT06-TT-NEF-NG25
THM0010212	1	2 x 25mm tubes	NT06-TT-NEF-NG26
Titan2 (NT06) double pole single fuse cut out, complete with earth block, large extension trough, and brass plate with :
THM0036546	1	2 x 25mm grommets	NT06-TT-NED-NG13
THM0037191	1	2 x 20mm tubes	NT06-TT-NED-NG25
THM0028975	1	2 x 25mm tubes	NT06-TT-NED-NG26
THM0016546	1	2 x BW25 glands and 1 x 25mm grommet	NT06-TT-NEE-NG82
Titan2 (NT08) double pole twin fuse cut out, complete with earth block, and brass plate with :
THM0009901	2	2 x 20mm grommets	NT08-TT-NG12
THM0012689	2	2 x BW20 brass glands	NT08-TT-NG18
THM0013303	2	2 x 20mm tubes	NT08-TT-NG25
THM0014521	2	2 x 25mm tubes	NT08-TT-NG26
Titan2 (NT08) double pole twin fuse cut out, complete with earth block, small extention trough, and brass plate with :
THM0010563	2	2 x 20mm grommets	NT08-TT-NEF-NG12
THM0029334	2	2 x 25mm grommets	NT08-TT-NEF-NG13
THM0014659	2	2 x BW20 brass glands	NT08-TT-NEF-NG18
THM0011708	2	2 x 20mm tubes	NT08-TT-NEF-NG25
THM0010841	2	2 x 25mm tubes	NT08-TT-NEF-NG26
Titan2 (NT08) double pole twin fuse cut out, complete with earth block, large 2-way extention trough, and brass plate with :
THM0037298	2	2 x 25mm grommets	NT08-TT-NED-NG13
THM0037316	2	2 x 20mm tubes	NT08-TT-NED-NG25
THM0037323	2	2 x 25mm tubes	NT08-TT-NED-NG26
Titan2 (NT10) double pole twin fuse cut out, complete with earth block, 3-way extension trough, and brass plate, with :
THM0027135	2	3 x 25mm tubes	NT10-NED-NEE-NT6-NG61
THM0012093	2	3 x 20mm grommets	NT10-NEC-NT6-NG68
THM0010786	2	2 x 25mm grommets, 1 x 20mm grommet	NT10-NEC-NT6-NG52

Lucy Zodion Titan2

Specifications

Lucy DNO Cut Outs Offer Street Lighting Contractors Improved Cable Termination Access

 

Lucy Lighting Titan SLF

Single Pole Cut Outs

With its low body split line to maximise cabling access, the Lucy Lighting Titan SLF is the simplest exponent of the single pole cut outs.

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The Lucy Zodion Titan MC040SLF cam operated fuse handle ensures that electrical disconnection takes place prior to the fuse carrier being extracted by the street lighting contractor.

Lucy Zodion MC040SLF Single Phase Cut Out Specifications

• Cut out designed and tested in accordance with BS 7654:1997
• 25A maximum fuse rating
• Accepts fuse links to BS 88 Part 1, AC 16 tag type
• IP22 rating
• Single pole isolation
• Single fuse
• Electroplated brass terminals with serrated bores
• Max. cable size; 16sqmm stranded copper, 25sqmm solid aluminium
•  Cable entry via PVC grommets as standard
• Outgoing cables exit below horizontal to form drip loop
• Sealing wire facility

Lucy Zodion Titan MC040SLF Single Phase Cut Out Dimensions
Height	150mm
Width	76mm
Depth	60mm
Order Details For MC040SLF Street Lighting Cut Out
Order Code	Description
MC040SLF 25A SLCO TYPE 1 (SNE)	Separate Neutral and Earth
MC040SLF 25A SLCO TYPE 2 (CNE)	Combined Neutral and Earth

➡ For further information about how Lucy Zodion provide control and power distribution products for street lighting applications, please review the Lucy Titan (Cut-outs) and Lucy Trojan (Isolators) ranges of products.

• Further Reading: Street Lighting Cut Outs From Lucy Zodion – WPD Approved (G81)

Complete range of LV Cable Accessories  ➡

Cable Breakouts | Cable Caps | Cable Lugs | Cable Cleats | Cable Trough | Cable Duct | Feeder Pillars | for 11kV/33kV/66kV networks see MV HV Joints & Terminations

Pfisterer | Nexans Euromold | Prysmian | Cable Joints & Terminations MV HV

Cold Shrink by 3M | Joints | Abandonment | Terminations | Low Voltage LV Cables

Lead Wiping | A Disappearing Cable Jointers Skill Video Tutorial

How to Wipe Lead Cables

Prior to Cable Jointing

• uploaded by - Chris Dodds Thorne & Derrick Sales & Marketing Manager

Heat shrink cable joints for jointing paper or polymeric insulated cables (PILC or XLPE) with lead sheaths are specified for Low Voltage power distribution systems in the oil, gas and petrochemical industries where underground cables are exposed to waterlogging and corrosive liquids and vapours – cable construction including the lead sheath cover or jacket protects against penetration and degradation of electric cable insulation by hydrocarbon contaminants (whether underground or airborne).

Today, lead wiping has virtually disappeared from the cable jointers skill-set as more modern techniques, such as constant force spring armour and lead earthing continuity kits, which are integral to 3M hydrocarbon resistant cable joint kits have become commonplace. The modern day trend towards the manufacture and adoption of Polymeric (XLPE EPR insulated) cables has further reduced the demand for jointers with competency to work, maintain and splice using PILC type cables.

Cable Jointing & Lead Wiping

Credit: ThunderboltNZ

Lead Sheath Cutting & Removal From Paper Insulated Cables

Due to Occupational Health & Safety problems with handling lead and associated fumes, lead wiping has been replaced by jointing the cable sheaths using copper earth braid and constant force springs.

Lead Sheath Wiping

Pictured : A cable repair being conducted on a 200 pair (400 wire) lead-sheathed, paper-insulated cable (PILC). The photo illustrates the difficult conditions under which cable jointers often have to work. The gas lantern is required for both lighting and heating as it is important that the paper insulation of the individual wires do not become damp.

The joining of paper-insulated, lead-sheathed cables is not an easy task. Each 200 pair joint can take over two days to complete. The wires are identified by a colour code and are layered in a particular way: a common mistake when repairing these cables is to join pair number 1 to pair number 200 (i.e. 180 degrees out of phase). Each wire is individually joined together and covered by a paper sleeve. The photo below shows a close-up of the cable being spliced with some pairs having been joined and the remainder temporarily folded back out of the way.

Cable Splicing

LV Cable Joints (Low Voltage Cables)

Thorne & Derrick stock and distribute LV Joints in Cold Shrink, Heat Shrink or Resin Cast technologies – multicore and multi-pair cable joints are available for immediate backfill and energisation of Low Voltage power, control and instrumentation cables 600V/1000V 3.3kV.

Further Reading

• LV Cable Diversion 4 Core PILC to 4 Core Wavecon Straight Joint
• PILC Replacement & Cable Longevity
• Cable Splicing At The Lazy Q Ranch

Complete range of LV Cable Accessories  ➡

Cable Breakouts | Cable Caps | Cable Lugs | Cable Cleats | Cable Trough | Cable Duct | Feeder Pillars | for 11kV/33kV/66kV networks see MV HV Joints & Terminations

Pfisterer | Nexans Euromold | Prysmian | Cable Joints & Terminations MV HV

Cold Shrink by 3M | Joints | Abandonment | Terminations | Low Voltage LV Cables

Fire Walls & Fire Risk Hazards Of Electrical Equipment – BS EN 61936-1 : 2010

BS EN 61936-1:2010 Fire Walls

The following information and clauses concerning fire walls is extracted from BS EN 61936-1:2010.

Power Installations Exceeding 1kV a.c. Common Rules

8.7 Protection Against Fire 8.7.1 General

Relevant national, provincial and local fire protection regulations shall be taken into account in the design of the installation.

NOTE: Fire hazard and fire risk of electrical equipment is separated into two categories: fire victim and fire origin.

Precautions for each category should be taken into account in the installation requirements.

1. precautions to fire victim:
2. space separation from origin of fire;
3. flame propagation prevention:

 physical layout of the substation,

 liquid containment,

 fire barriers (e.g. REI fire-resistant materials 60/90),

 extinguishing system;

1. precautions to fire origin:
2. electrical protection;
3. thermal protection;

• pressure protection;

1. fire resistant materials.

Care shall be taken that, in the event of fire, the escape and rescue paths and the emergency exits can be used (see 7.1.6).

The user or owner of the installation shall specify any requirement for fire extinguishing equipment. Automatic devices to protect against equipment burning due to severe overheating, overloading and faults (internal/external) shall be provided, depending on the size and significance of the installation.

Equipment in which there is a potential for sparks, arcing, explosion or high temperature, for example electrical machines, transformers, resistors, switches and fuses, shall not be used in operating areas subject to fire hazard unless the construction of this equipment is such that flammable materials cannot be ignited by them.

If this cannot be ensured, special precautions, for example fire walls, fire-resistant separations, vaults, enclosures and containment, are necessary.

Consideration should be given to separating different sections of switchgear by fire walls. This can be achieved by means of bus ducts which penetrate the fire wall and which connect the sections of the switchgear together.

8.7.2 Transformers, Reactors

In the following sub-clauses, the word ‘transformer’ represents ‘transformers and reactors’.

For the identification of coolant types, see 6.2.2.IEC 61100 classifies insulating liquids and transformer oils according to:fire point and net caloric value (heat of combustion).

Three classes have been defined:

 Class O, if the fire-point is less than or equal to 300 °C. (e.g Mineral Oil).

 Class K, if the fire-point is above 300 °C. (e.g MIDEL 7131 and MIDEL eN 1024).

 Class L, if the insulating liquid has no measurable fire-point.(e.g. Xiameter PMX-561).

IEC 60076-11 classifies dry-type transformers in terms of their behaviour when exposed to fire. The fire hazard associated with transformers of outdoor and indoor installations is dependent on the rating of the equipment, the volume and type of insulating mediums, the type and proximity and exposure of nearby equipment and structures.

The use of one or more recognized safeguard measures shall be used in accordance with the evaluation of the risk.

♦ IEC 60076-11:2018 Power Transformers – Part 11: Dry-type Transformers

NOTE: For definition of risk, see ISO/IEC Guide 51.

Common sumps or catchment tanks, if required, for several transformers shall be arranged so that a fire in one transformer cannot spread to another. The same applies to individual sumps which are connected to the catchment tanks of other transformers; gravel layers or pipes filled with fluid can, for example, be used for this purpose.

Arrangements which tend to minimize the fire hazard of the escaped fluid are preferred.

8.7.2.1 Outdoor Transformer Installations

The layout of an outdoor installation shall be such that burning of a transformer with a liquid volume of more than 1,000 litres will not cause a fire hazard to other transformers or objects, with the exception of those directly associated with the transformer. For this purpose, adequate clearances, G, shall be necessary.

Guide values are given in Table 3. Where transformers with a liquid volume below 1,000 litres are installed near combustible walls, special fire precautions may be necessary, depending on the nature and the use of the building.

If automatically activated fire extinguishing equipment is installed, the clearance G can be reduced.

If it is not possible to allow for adequate clearance as indicated in Table 3, fire-resistant separating walls with the following dimensions shall be provided:-

a) between transformers (see Figure 6) separating walls. For example EI 60 in accordance with the Official Journal of the European Community, No. C 62/23:

 height: top of the expansion chamber (if any), otherwise the top of the transformer tank;

 length: width or length of the sump (in the case of a dry-type transformer, the width or length of the transformer, depending upon the direction of the transformer);

b) between transformers and buildings separating walls. For example EI 60; if additional fire separating wall is not provided, fire rating of the building wall should be increased, for example REI 90 (see Figure 7) in accordance with the Official Journal of the European Community C 62/23.

Table 3 – Guide Values For Outdoor Transformer Clearances

NOTE 1: Enhanced protection means:

• tank rupture strength
• tank pressure relief
• low-current fault protection
• high-current fault protection

For an example of enhanced protection, see Factory Global standard 3990 (33) or equivalent.

NOTE 2: Sufficient space should be allowed for periodic cleaning of resin-encapsulated transformer windings, in order to prevent possible electrical faults and fire hazard caused by deposited atmospheric pollution.

Three classes have been defined:

 Class O, if the fire-point is less than or equal to 300 °C. (e.g Mineral Oil)

 Class K, if the fire-point is above 300 °C. (e.g MIDEL 7131 and MIDEL eN 1024)

 Class L, if the insulating liquid has no measurable fire-point.(e.g. Xiameter PMX-561)

8.7.2.2 Indoor Transformer Installation In Closed Electrical Operating Areas

Minimum requirements for the installation of indoor transformers are given in Table 4.

Table 4 – Minimum Requirements For The Installation Of Indoor Transformers

NOTE 1: REI represents the bearing system (wall) whereas El represents the non-load bearing system (wall) where R is the load bearing capacity, E is the fire integrity, I is the thermal insulation and 60/90 refers to time in minutes.

NOTE 2: Enhanced protection means:

• tank rupture strength
• tank pressure relief
• low-current fault protection
• high-current fault protection

For an example of enhanced protection, see Factory Global standard 3990 (33) or equivalent.

NOTE 3: Sufficient space should be allowed for periodic cleaning of resin-encapsulated transformer windings, in order to prevent possible electrical faults and fire hazards caused by deposited atmospheric pollution.

Doors shall have a fire resistance of at least 60 min. Doors which open to the outside are adequate if they are of low flammability material. Ventilation openings necessary for the operation of the transformers are permitted in the doors or in adjacent walls. When designing the openings, the possible escape of hot gases shall be considered.

8.7.2.3 Indoor Transformer Installations In Industrial Buildings

For all transformers in industrial buildings, fast-acting protective devices which provide immediate automatic interruption in the event of failure are necessary.

Transformers with coolant type O require the same provisions as in 8.7.2.2.

For all other liquid-immersed transformers, no special arrangements in respect of fire.

protection are required, except for the provisions for liquid retention in case of leakage and the provision of portable fire extinguishing apparatus suitable for electrical equipment.

Dry-type transformers (A) require the selection of the correct fire behaviour class depending on the activity of the industry and on the material present in the surroundings. Fire extinguishing provisions are advisable, particularly for class F0.

NOTE: For all transformers in industrial buildings, additional fire precautions may be necessary, depending on the nature and use of the building.

8.7.2.4 Indoor Installations In Buildings Which Are Permanently Occupied By Persons

In high-voltage installations, located in public or residential buildings, special conditions shall be observed in accordance with existing standards or national regulations.

8.7.2.5 Fire in the vicinity of transformers

If there is an exceptional risk of the transformer being exposed to external fire, consideration shall be given to

• fire-resistant separating walls;
• gas-tight vessels capable of withstanding the internal pressure generated;
• controlled release of the hot liquid; fire extinguishing systems.

8.7.3 Cables

The danger of the spread of fire and its consequences shall be reduced, as far as possible, by selecting suitable cables and by the method of installation.

The cables may be assessed by reference to the following categories:

• cables without particular fire performance characteristics;
• cables (single) with resistance to flame propagation (IEC 60332 series);
• cables (bunched) with resistance to flame propagation (IEC 60332 series);
• cables with low emission of smoke (IEC 61034-1);
• cables with low emission of acidic and corrosive gases (IEC 60754-1 and IEC 60754-2);
• cables with fire-resisting characteristics (IEC 60331-21 or IEC 60331-1).

Cables in trenches and buildings shall be laid in such a way that the regulations regarding fire safety of the building are not adversely affected. For example, to avoid fire propagation, holes or cable ducts through which the cables go from one room to another shall be sealed with suitable fire proof and resistant material.

A physical separation or different routing of power circuits from the control circuits for high voltage equipment is recommended if it is necessary to preserve the integrity of the latter as long as possible following damage to the power circuits.

Where necessary, a fire alarm and fire extinguishing systems shall be installed in cable tunnels and in cable racks in the basement of control buildings.

8.7.4 Other Equipment With Flammable Liquid

For all equipment, such as switchgear which contains more than 100 l of flammable liquid in each separate compartment, special fire precautions as specified for transformers may be necessary, depending on the nature and use of the installation and its location.

Figure 6 – Separating Walls Between Transformers

Figure 7 – Fire Protection Between Transformer & Building

Key

For Clearance G. see Table 3

a) The wall in this area shall be designed to avoid a spread of fire

Further Reading

Transformer Oils – 11kV 33kV 66kV Substation Transformer Oil Refilling, Sampling & Analysis

Utilising Distribution Transformers To Optimise Solar

11kV Transformers | Introducing Amorphous Core HV Transformers

VIDEO How To Verify Total Absence of Voltage By The Push Of a Button

THORNE & DERRICK SPECIALIST ELECTRICAL DISTRIBUTOR

The 11kV Specialists

Thorne & Derrick distribute the most extensive range of 11kV Cable Jointing, Terminating, Pulling & Installation Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at 11kV and up to and EHV transmission and distribution voltages.

• Key 11kV Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Copper Earth Tapes, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.

• Distributors for: 3M Cold Shrink, ABB, Alroc, Band-It, Catu, Cembre, Centriforce, CMP, Elastimold, Ellis Patents, Emtelle, Furse, Lucy Zodion, Nexans Euromold, Panduit, Pfisterer, Polypipe, Prysmian, Roxtec.

LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)

MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)

Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment

T&D, CATU Electrical Safety & Arc Flash Protection Specialists for SAP’s, Linesmen, Jointers & Electrical Engineers – Largest UK Stockist

ALVIN by EA Technology | Identify LV Electrical Equipment Faults

ALVIN by EA Technology Identify LV Electrical Equipment Faults

• uploaded by - Chris Dodds Thorne & Derrick Sales & Marketing Manager

ALVIN by EA Technology

The ALVIN (Automatic Low Voltage Intelligent Network) has been developed by EA Technology (EATL) and is supporting customers and saving time and money through speedy fault and location detection.

ALVIN Reclose is the next generation of supply-restoration reclose equipment, providing Network Operators with invaluable support in reducing costs and delivering better customer service.

ALVIN Reclose meets the immediate needs of Network Operators to improve customer service on ageing, low voltage networks, while providing the foundation for future automation and communication schemes.

EA Technology’s ALVIN Reclose is the most advanced, compact, cost-effective solution available on the market enabling intelligent automation and fault restoration on low voltage electrical and cable networks.

ALVIN Reclose

ALVIN & Western Power Distribution

Stoke Plant Team Manager at Western Power Distribution Steve Weddell said: “We use the ALVINs on intermittent faults where existing electrical equipment has failed to locate the issue or where visibility of the underlying problem is required. It provides visibility to power quality information which helps to locate the fault or power quality issue.”

Steve and his team worked closely with EA Technology for 12 months and the team has since achieved 100% success rate in detecting issues where we have deployed the ALVIN on known faults and problem circuits.

Western Power Distribution Using ALVINs On Intermittent Faults

Stoke Engineering Specialist David Phillips gave a real case example of where the ALVIN has helped customers. “In early 2018 we received reports of flickering lights in Alrewas in the Stoke distribution patch. Power quality devices were fitted but no meaningful cause for the disturbance was found.

The issue continued for several months.

During a visit to EA Technology my colleague and I discussed the matter and we decided to use the ALVIN as an experiment to investigate the cause. On installation, the problem was immediately found and the electrical power fault rectified within two days.”

The device records the voltage and current waveforms associated with a collection of brief faults, which disappear (self-heal) before a fuse operates. The ALVIN fits in a standard low voltage holder and which, on detection of a fault, will break the circuit and disconnect supplies, wait for approximately thirty seconds, then reclose and reconnect the circuit.

The ALVIN fits in a standard low voltage holder and which, on detection of a fault, will break the circuit and disconnect supplies, wait for approximately thirty seconds, then reclose and reconnect the circuit.

In 2017 EA Technology launched a new LV (Low Voltage) Cloud data service which enabled the voltage and current waveform visualisation and fault location service to be provided.

Identify LV Electrical Equipment Faults With ALVIN By EA Technology

We have had several sets of ALVINs since 2016. Approximately 12 months ago, we bought the communication equipment which enabled it to communicate to the LV Cloud.  These sets have been distributed between Nottingham and Stoke depots where the ALVIN systems have been deployed to manage and locate problematic LV faults.

David explained: “The waveform data is captured by the device and the status of customer supplies is confirmed by text or email.  The severity and frequency of pre-fault activity can be used to indicate supply interference as well as implying the likelihood of an impending fault or probability of getting a good thermal reading or ‘sniff’ of fault gases to confirm the suspected location fault.

David concluded: “We have found the units to be extremely versatile and currently work in close partnership with EA technology in exploring the possibilities of these devices and future development.”

ALVIN Reclose

ALVIN

Business Benefits

• Ability to identify and ‘self-clear’ multiple transients and overload faults so reducing engineering costs and delivering improved customer service
• Simple, retrofit installation with no hidden ‘start up’ costs means the low-cost ALVIN Reclose offers excellent cost/benefits justification.
• flexible features give businesses exactly what they need now.  The device is the foundation building block of a range of low-cost add-on devices and services, making it ‘future-adaptable’
• ALVIN Reclose uses the latest technologies, ensuring the safety of employees and customers
• The ALVIN Reclose device allows for more effective asset management, increasing reliability, efficiency and safety at lower costs

Automatic Low Voltage Intelligent Network

Features

• Automatic ‘self-clearing ‘of transient and overload faults,
• Supply restoration with no need for manual intervention
• High quality specification, functionality and reliability
• ‘All-in-one’ mechanism tests and restores power automatically
• Unique SafeON™ technology ensures power can be restored safely
• Fully self-contained, it does not require any auxiliary components
• Full load, network analysis and diagnostics are available through the external data port
• Ready for future use: it is the foundation for a range of low-cost, add-on products and services
• The only retrofit product with arc-less switching for improved network protection.
• Fitting is simple, fast, safe and compatible with existing 92mm fuse holders
• factory programmed to suit different customer requirements
• Comprehensive training, together with on-call service support

ALVIN Technical Specification

EA Technology

EA Technology are a global provider of end to end power engineering solutions and provide expert consultancy, innovative instruments, skills training, technical services and more.

Thorne & Derrick Specialist Electrical Distributor

Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.

Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.

Distributors for : 3M, Pfisterer CONNEX, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.

T&D Providers Of Jointer Training Courses By Pfisterer CONNEX & Nexans Euromold