Electrical Safety

Marechal – The Decontactor

Thorne & Derrick UK | Main Stockist & Preferred Distributor 

• uploaded by Chris Dodds | Sales & Marketing Manager at Thorne & Derrick International

Improve Electrical Safety & Power Reliability

Inertia and a resistance to change prevents progress even where the allure or reason for the initial attraction has long since past.

Working with Marechal, a world-leading manufacturer of industrial plug-socket assemblies, Thorne & Derrick can provide increased safety and improved reliability compared to the traditional “hard-wiring” approach to low voltage power distribution using their innovative Decontactor technology.

The decontactor

DECONTACTOR = PLUG + SOCKET + integral switch disconnector

Marechal Decontactors can be disconnected under full electrical load for planned maintenance or rapid change out of equipment during plant shutdowns and turnarounds.

• Load Break Release Button & Safety Shutter

Marechal plugs feature a safety button placed on the upper section of the safety socket enabling the user with a single press of the button to disconnect the equipment up to 250A – no specialist skills or training is required to install the plugs.

Marechal plug-socket assemblies can be removed in complete safety – the power outlet installation is safe and does not represent an electrical hazard guaranteeing operating speed and time savings during installation operations or machine shutdown.

As an additional feature a safety shutter protects the user according to IP4X/IPXXD – the live contacts are inaccessible behind the closed shutter.

Electrical power can be controlled and distributed up to 1100V, 660Amps using the Marechal P66 high voltage connector for industrial applications.

Anatomy Of The Decontactor  

The Marechal decontactor is a plug and socket with an integral load-break switch – this unique design offers various benefits :

• contact quality
• safe disconnection
• automatically watertight
• cost reduction due to dual-voltage
• robust and reliable

Marechal | The Decontactor

Make The Switch!

Out With The Old, In With The New. Contact T&D to arrange a UK site demonstration or survey of your power distribution requirement. No obligation. No cost.

Whatever The Weather, Wherever The Zone

We think we can meet any Power Distribution challenge.

Automatic IP66/IP67 dust and liquid tightness – check.

Hazardous area Zone 1 and Zone 2 – yes, compliant with ATEX and IECEx.

Signal and control options – yes, up to 37 contacts.

High current capability – got it covered, connect up to 250amps. Single pole options up to 700amps. 

Handle heat – we can cope, withstand 400°C.

Ex Decontactors | Plugs and socket-outlets with integrated switch, designed and certified for hazardous areas (ATEX 2014/34/EU Directive) – this includes Zones 1 & 2 (Flammable Gas) and Zones 21 & 22 (Combustible Dust) potentially explosive atmospheres.

Datacentre | BESS | Windfarm | Construction | Solar | Process Industries

PADS Approved Temporary Rail Jumper Kit | PBwel

Temporary Rail Jumper Kit

PADS Approved 0006/120053

The PBwel Temporary Rail Jumper Kit allows faulty equipment such as switches to be by-passed, in order to maintain the network until repairs can be made to return the asset to service. The EFT-19319 kit is suitable to by-pass a continual traction load of 600A even upon heavily weathered overhead conductors.

The kit is accepted for use on Network Rail controlled 25kV OLE infrastructure with PADS approval 0006/120053.

Each kit comprises of three 120mm² clear Aluflex lead assemblies with heavy duty terminations fitted to special S9B Line End clamps.

💡 Thorne & Derrick, the UK Preferred Distributor for P&B Weir Electrical Ltd (PBwel), are now stocking their range of Rail Earthing Equipment with PADS Approval for use on Network Rail high voltage electrification projects. This significant and strategic stock holding is the culmination of discussions and planning to support framework contractors and construction alliances during and beyond the current CP6 plan. 💡

Portable Full Current Jumper Kit

The Portable Full Current Jumper kit utilises the original P&B (PBwel) S9B Line End clamp, which has been used by Network Rail/ Railtrack/ British Rail for many decades and has a proven record for reliability and performance.

The clamps are lightweight and compatible with standard operating poles. The addition of a serrated jaw has proven to ensure good contact with dirty/weathered conductors and provides sufficient capacity to carry full traction current over an extended period.

Continuous Current Rating – 600A

Short Circuit Rating- 54kA/1sec

Order of Application and Removal

Site rules and PPE requirements should be fully understood and adhered to when using this kit. Possession and de-energisation should be sought according to procedures and an Authorised Person should also determine where the kit should be safely applied.

The conductor should be tested for absence of Line Voltage prior to fitting the kit.

Each lead should be applied in turn, with two Overhead Line Engineers raising and applying both S9B clamps at the same time, using two operating poles. Care should be taken to ensure that both clamps are securely fitted onto the conductor/ armour rods.

Failure to do this could result in a poor current path or (under severe circumstances) several hanging leads, which if subjected to a fault could pose a risk of serious danger.

PB120T terminations are employed to suit the application, which allows the kit to be distinguished from standard earths.

Application and Removal of the S9B Clamp

The operating screw of the S9B Line End clamp should be firmly inserted into the operating socket until the spring action of the socket holds the clamp in place, this is a bayonet style fitting and the cross-pin of the operating screw should be correctly located.

The clamp should then be raised towards the conductor or arm our rod and hooked over, so that the conductor/armour rod sits between the jaw and the body of the S9B. The clamp should then be firmly tightened onto the conductor/armour rod by rotating the operating pole in a clockwise direction.

At this point, the pole can be removed by firmly lifting the pole and rotating it in an anti-clockwise direction, before slowly lowering the pole to dis-engage the clamp from the socket. The pole should then be carefully lowered to the ground making sure all staff are clear of the area intended for ‘landing’.

Application of S9B Clamp

When removing the clamp, the pole should be carefully raised and the operating screw of the clamp inserted into the centre of the socket. The pole should be firmly pressed in an upward direction as the pole will freely lift a small amount. Once engaged the pole may be rotated anti-clockwise to loosen the clamp from the conductor.

Once sufficiently loose (it is recommended the clamp is fully opened and ‘pinched’ tight, to aid control) the pole may be lifted to raise the clamp off of the conductor before carefully lowering to the ground.

Removal of S9B Clamp

Thorne & Derrick supply an extensive range of 400V-33kV Rail Cable Accessories & Power Distribution Sytems including feeder pillars to contractors undertaking Low Voltage Power Distribution, HV Electrification & Substations, DC Traction & Networks, OLE and Track Feeder Cable Renewals – a complete range of Network Rail PADS approved track terminations, cable joints, cable repair and connection products up to 25kV, including 3M Cold Shrink, Pfisterer CONNEX and Nexans Euromold products.

Heat shrink, cold shrink, push-on and slip-over cable accessories enable the jointing, terminating and connection of medium/high voltage power cables to oil, air or gas insulated switchgear, transformers, motors and overhead lines.

Full range of Cable Pulling Equipment & Products to ensure safe and efficient of rail cables in to cable ducts and containment infrastructure including cable troughs.

Reliable & Compliant Cable Accessories for Substation, Trackside & OHL Power Supply

Contact us for a Quotation for Rail Earthing Equipment

See How DEHN Provides Electrical Protection for Wind Turbines

Electrical Protection For Wind Turbines

Electrical Protection for Wind Turbines

Lightning & Surge Protection by DEHN

Ensure smooth operation and protect investments with lightning and surge protection safety equipment from DEHN.

Committed to the protection of workers and material assets, Thorne & Derrick together with DEHN can offer electrical protection specifically for wind turbines with a range of innovative products.

Thorne & Derrick provide an extensive range of electrical safety equipment including insulating gloves, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out maintenance on LV-HV switchgear, substations, cables and electrical equipment.

Secure profit on your investment

The feed-in remuneration for renewables is sinking worldwide and putting the wind branch under increasing pressure. To ensure that investments in new wind turbines pay off in future, too, the top priority is to optimise the availability of the turbines. This prevents loss of revenue due to downtime and high service and repair costs.

Their height makes wind turbines particularly susceptible to destructive lightning events. If insufficient protective measures are taken, the risk of damage and downtime due to lightning is correspondingly high. An integrated lightning protection system is therefore a must.

It consists of external and internal lightning protection, earthing and equipotential bonding.

Take the safe option and entrust the globally recognised specialist DEHN with your lightning and surge protection. Our high-quality and durable products protect turbines on all continents, from the foundations to the rotor blades. Take advantage of our services and make quicker and verifiable progress. We can assist you by, for example, conducting risk analyses, creating bespoke protection concepts and product solutions, or conducting system tests in our accredited test centre.

Developing lightning protection zone concepts with expertise

To secure the availability of wind turbines, the lightning protection zone concept aims to prevent lightning damage to mechanical and electric components. This is achieved by discharging lightning current and controlling surges.

The lightning protection zone concept for wind turbines described in IEC 61400-24 deals with the topic of lightning protection for wind turbines including detailed information on the selection of lightning and surge protection measures 1).

As the basis for creating a protection concept, a wind turbine is subdivided into lightning protection zones. One distinguishes here between external zones (LPZ 0A und 0B) and internal zones (LPZ 1, LPZ 2…n) 2). The external zones of a wind turbine – except the rotor blade – are determined by way of the rolling sphere method. The subdivision of the internal zones very much depends on the construction of the individual wind turbine and should be conducted accordingly.

Having laid down the relevant lighting protection zones, one can then define the necessary protective measures. It is advisable to create a lightning protection concept at the initial planning stage of a wind turbine to avoid later cost-intensive repairs and retrofitting. Long experience in the field of lightning and surge protection and the numerous system tests conducted for the wind industry have given DEHN the know-how to develop effective lightning protection systems for wind turbines. We will assist you in developing a lightning protection concept for your turbine consisting of external lightning protection, internal lightning protection, equipotential bonding and earthing.

1) IEC 61400-24 Lightning Protection of Wind Turbines
2) LPZ: Lightning Protection Zone

Always reliably informed with DEHNdetect

Lightning Current Measuring System Prevents Subsequent Damage

Damage resulting from a lightning strike does not necessarily lead to the immediate failure of the turbine. This means that lightning events often remain undetected, especially in the case of upward flashes where the initial long stroke current flowing is only a few 100 A and can be the main cause of damage, e.g., to the rotor blades.

Continued operation of the turbine can lead to serious subsequent damage. Lightning current measuring systems are often employed to detect lightning events and prevent subsequent damage. However, dangerous upward flashes are not always fully detected due to the low current flow of the measuring system. As well as impulse currents, DEHNdetect also reliably registers these dangerous long stroke currents, thus preventing expensive maintenance work and long downtimes. DEHNdetect identifies the following parameters:

• Impulse current [kA]
• Long stroke current [A]
• Load [C]
• Specific energy [MJ/Ω]
• Rise time [kA/μs]

Benefits:

• Prevention of subsequent damage
• Reduction of maintenance / repair costs
• Reduction of downtime

The system can be integrated in the IT infrastructure of the wind turbine via existing interfaces. The data can then simply be read out and managed using the available SCADA systems. If direct integration is not possible, the data can be transmitted to a cloud and evaluated via a web application. This makes it possible to monitor several turbines or even entire wind parks.

Invest in availability to secure the power supply of your turbine, today and tomorrow.

DEHNdetect Components
1		DEHNdetect BDU Detector for the wireless detection of lightning current in the rotor.
2		DEHNdetect ICC IMP Measuring coil long stroke current and impulse current. Measuring range 60 A to 250 kA.
3		DEHNdetect DL Data logger with different interfaces for integration in IT systems.
4		DEHNdetect integrator Processing of the measuring signals and transmission to the data logger.

Lightning & surge protection

in the Wind Turbine nacelle

All lightning and surge protective devices by DEHN for application in wind turbines are vibration- and shock-tested in compliance with IEC 60068-2.

Power Supply Systems

By implementing coordinated surge protection measures for power supply systems, the risk of system downtime due to lightning currents and surges can be avoided. This increases the availability of the wind turbine in the long term.

Information Technology Systems

A consistent protection concept prevents damage to information and data systems. Condition monitoring is indispensable for operational safety and plant availablity. The monitoring unit for the condition-oriented monitoring of up to 50 BLITZDUCTORconnect arresters fulfils this task. Remote monitoring is also possible.

Application			Type
Power Supply Systems
1		DEHNsolid	Rotor blade heating Coordinated type 1 SPD, with 200 kA discharge capacity and low voltage protection level (Up ≤ 2.5 kV).
2		DEHNguard M TN CI	Pitch system, aircraft warning light Type 2 SPD, especially space- and cost-saving due to integrated backup fuse.
3		DEHNguard SE H 1000 VA FM + earthing clip	Generator Type 2 SPD, further development of the “Neptune circuit” – Advantages: small dimensions save space and costs, improved protection level.
4		DEHNguard M TNC	Voltage supply Type 2 SPD
Information Technology Systems
5		BLITZDUCTORconnect ML2 BE 24 ML2 BE HF 5	Protects signal, bus or control lines Combined lightning current and surge arrester with status indication and push-in connection terminals. With optional monitoring of arresters via the DRC IRCM condition monitoring unit.
		DEHNpatch Class E	Universal type 2 SPD for Ethernet and structured cabling up to 250 MHz.
		BLITZDUCTOR VT	Weather station Type 1 SPD for applications with nominal currents up to 7 A.
		DEHNrecord IRCM	Condition monitoring unit for up to 50 BLITZDUCTORconnect arresters. With LED status indication and floating remote signalling contact.

Safely discharging lightning current

External Lightning Protection

Safe interception and discharge of direct lightning strikes is paramount for the availability of a wind turbine. DEHN ensures that this is the case by testing components like the HVI power Conductor with a lightning current of 200 kA (10/350 μs) as stipulated in IEC 62561. The stainless steel design of the air-termination rods and connection elements fulfils stringent corrosion resistance requirements.

Earthing & Equipotential Bonding

Safe operation of electrical equipment and systems and a well-functioning lightning protection system require an earth-termination system designed according to IEC 61400- 24 1). Connection elements which are capable of carrying short-circuit current ensure the safe contact of the earth-termination system with metal parts of the foundations and the main earthing busbar. A high level of product quality safeguards long-term mechanical strength and corrosion resistance.

Application			Type
External Lightning Protection
1		HVI power Conductor (in supporting tube with air-termination rod))	Class of LPS 1 – 200 kA (10/350 μs) – High-voltage-resistant, insulated down conductor for maintaining the separation distance.
		HVI power long Conductor (cut to length)	Individual lengths, on request we can assemble your conductors with the appropriate connection elements.
		UNI disconnection clamp 200 kA	200 kA lightning current carrying capability according to IEC 62561- 1 2), stainless steel V2A.
		KS connector 200 kA	200 kA lightning current carrying capability according to IEC 62561- 1 2), stainless steel V2A.
		MV clamp 200 kA	200 kA lightning current carrying capability according to IEC 62561- 1 2), stainless steel V2A. Lightning current carrying connection of the air-termination system and down conductor.
		Tubular air-termination rod	Safe interception of the flash charge in permanently corrosionresistant, stainless steel design.
		Air-termination rod StSt	Safe interception of the flash charge in permanently corrosionresistant, stainless steel design

Application			Type
Foundation Earthing
1		Connecting clamps	Clamps for connecting round and flat conductors in concrete foundations and reinforcements with round and flat conductors with tested short circuit current carrying capacity (50 Hz).
		Round wire 10 mm St/tZn	Round wire tested to IEC 62561-2 for use in lightning protection and earth-termination systems 3).
		Strip 30 x 3.5 St/tZn	Strip tested to IEC 62561-2 for use in lightning protection and earth-termination systems 3).
		Fixed earthing terminal type M V4A	Corrosion-resistant connection of the ring earthing with the foundation earthing at the base of the tower.
Ring Earth Electrode
2		Connection clamp with threaded bolt StSt (V4A)	For connection of round and flat V4A conductors to fixed earthing terminal
		Cross unit StSt V4A	Corrosion-resistant connection of the individual ring conductors in V4A.
		Stainless steel strip V4A	Corrosion-resistant ring conductor in V4A.
Equipotential Bonding
3		Equipotential bonding in the tower base/equipotential busbar StSt	Suitable for equipotential bonding and protective/functional equipotential bonding.

Safe service and maintenance work
DEHN safety equipment

Safe Right Down The Line

Work on electrical systems is becoming more and more demanding. Make sure you use safe and reliable equipment. DEHN offers tested products and reliable services which protect your employees from injury caused by arc faults and secure the availability of your systems. This gives you, as the employer, legal certainty.

Safe At Work

• Personal protective equipment and arc flash clothing
• Voltage detectors
• EaS devices
• Fixed ball points
• Arc fault protection systems

Application
External Lightning Protection
	Safe when it matters most Reliable protection against arc faults in electrical installations: DEHNcare personal protective equipment keeps you safe from the thermal effects of an arc fault. DEHNcare equipment is also comfortable to wear thanks to the unique material combination of leather and neoprene. The protective equipment is tested to international standards and consists of a hood, safety helmet for electricians, face shield, protective gloves, jacket and trousers or coat.
Voltage Detectors
	Safe right down the line Make sure that no voltage is present with a capacitive voltage detector from 1kV to 420kV. Choose from a wide range of voltage detectors – you are bound to find your voltage and frequency!
EaS devices and fixed ball points
	Safe earthing and short-circuiting (EaS) Configuring your individual EaS device for your system is simple and flexible. Fixed ball points You can achieve maximum short-circuit strength by connecting the ball head cap and the connection clamps of the earthing and short-circuiting device.
Arc fault protection system
	Safe – fast – flexible DEHNshort quenches arc faults in your low-voltage switchgear installations in milliseconds. Your employees are safe when carrying out maintenance and repairs. Profit from optimised system availability: your system runs and runs, downtime due to an arc fault is significantly reduced.

ELECTRICAL SAFETY PROVIDERS

We protect substation engineers, asset managers, SAPS, cable jointers, overhead linesmen and utility workers with PPE and safety equipment: this includes insulating gloves, arc flash clothing, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out repair and maintenance on LV-HV switchgear, transformers, substations and turbines.

All of our Cable Connection & Energisation Accessories including Medium & High Voltage joints, terminations, connectors and cleats are tested to the latest international standards and supporting ranges of professional installation tools are stocked to reduce incident, accident and downtime to plant and people.

High Voltage Inspections | Wireless Inspection Camera for Systems up to 33kV/123kV

DEHN High Voltage Inspections Camera

High Voltage Inspections Camera

Brings the invisible to light

DEHN are committed to the protection of workers and material assets with their developments and innovative products in the field of lightning protection, surge protection and safety equipment. DEHN ensure that your buildings and installations are protected during operation, maintenance and repair. Their focus is particularly on wind energy, photovoltaic, process industry, traffic and communication solutions.

The Wireless Inspection Camera has been introduced for use with systems up to 123kV – allowing for easy and quick inspections on high voltage switchgear installations, even on difficult to access parts.

Facilitates work

The inspection camera makes regular inspections on medium-voltage and low-voltage installations easier: difficult to access parts can be easily reached with the flexible operating head.

Saves time

The installation does not have to be disconnected during inspection. The state of the installation can be evaluated with the help of photos and films and measures can be discussed.

Increases safety

Photos of the installation are transmitted live from the inspection camera to a smartphone or tablet computer via radio link. This ensures that the electrician does not have to enter the live working zone.

Brings the invisible to light

The inspection camera allows the state of the installation to be monitored without great effort. Tools forgotten during maintenance work can be found with the help of photos and films.

Brings light into the dark

Flexible working at any time, day or night, even in poorly illuminated environment. With the additional optional lighting you are independent of the lighting conditions.

Wireless Inspection Camera for High Voltages up to 123kV

Reliable inspection and easy operation via radio link to a smartphone or tablet

The 123kV wireless inspection camera is supplied as a complete set in a case. It consists of a camera with battery, USB cable, smartphone attachment, housing, adapter with gear coupling and transport case.

• For visual inspection of electrical installations with nominal voltages up to 123 kV / 15 to 60 Hz (without special training)
• Installation does not have to be disconnected
• For documentation of the state of the installation
• Wireless operation of the camera via smartphone or tablet computer (System requirements: Android version 4.0 – 5.1 or iOS version 7.0 – 12.0)

ELECTRICAL SAFETY PROVIDERS

We protect substation engineers, asset managers, SAPS, cable jointers, overhead linesmen and utility workers with PPE and safety equipment: this includes insulating gloves, arc flash clothing, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out repair and maintenance on LV-HV switchgear, transformers, substations and turbines.

All of our Cable Connection & Energisation Accessories including Medium & High Voltage joints, terminations, connectors and cleats are tested to the latest international standards and supporting ranges of professional installation tools are stocked to reduce incident, accident and downtime to plant and people.

Protection Against Arc Flash, Faults & Electric Shock | 5 Safety Rules

Protect employees from electric shock and arc faults

In industries working around high and low voltage electricity, the importance of Electrical PPE  and arc flash protection is widely recognised, and the latest electrical safety requirements are understood by managers and operatives alike.

It is imperative that the 5 safety rules are complied with to prevent accidents when working on electrical systems. By using insulating tools and equipment, electric arcs are prevented from forming and the working distance is made bigger.

DEHN are committed to the protection of workers and material assets. The energy and the spirit of innovation of more than 1,400 employees are reflected in their developments and innovative products in the field of lightning protection, surge protection and safety equipment.

DEHN protection at a glance:

Effective – The probability of an arc fault occurring is reduced and the PPE protection level increased.

Protective – The employee is further removed from the system, increasing his/her safety during work.

Competent – DEHN offers the right products for complying with the 5 safety rules.

Foresighted – A large range of services ensures that electrical equipment is kept safe permanently.

ARC FLASH Protection | Five safety rules

1. Disconnect completely				Operating poles are used for safe hot stick working when switching and insulating live equipment.
2. Secure against reconnection				Locking devices secure the work location against re-powering.
3. Verify that the installation is dead				Voltage detectors are available for verifying a dead condition on all poles at the work location.
4. Earthing and short-circuiting				Earthing and short-circuiting devices for earthing and short-circuiting electrical systems.
5. Provide protection against adjacent live parts				Insulating protective shutters for protecting against accidental contact with live parts of an installation.

reducing Arc Flash risk

The use of tested insulating tools and operating sticks reduces the probability of occurrence of an arc fault and thus also the risk involved. Furthermore, the individual is distanced further away from the system (working distance) due to the lengths of the insulating sticks, meaning the PPE protection level is increased.

Arc Flash Protection & Electrical Safety Products | Distributed By Thorne & Derrick

ELECTRICAL SAFETY PROVIDERS

We protect substation engineers, asset managers, SAPS, cable jointers, overhead linesmen and utility workers with PPE and safety equipment: this includes insulating gloves, arc flash clothing, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out repair and maintenance on LV-HV switchgear, transformers, substations and turbines.

All of our Cable Connection & Energisation Accessories including Medium & High Voltage joints, terminations, connectors and cleats are tested to the latest international standards and supporting ranges of professional installation tools are stocked to reduce incident, accident and downtime to plant and people.