3M Cable Joints & Terminations

A series of informative and educational Video Blogs demonstrating how to joint, terminate and abandon cables using Cold Shrink and Scotchcast Resin type products.

How To Protect LV MV Cables From Electrical Arc Faults & Fire

June 2nd, 2020

3M Scotch 77 Arc Faults & Fire Proofing Tapes

Electrical Arc Faults

Electrical arc fault generated fires can be of up to 2000 Degrees Fahrenheit.

That’s more than twice as hot as the temperature of the surface of Venus and enough heat to melt gold.

Furthermore, this is more than enough to destroy expensive electrical cables.

The resulting catastrophes of an electrical arc fault generated fire means that we have to find a solution to protect cables against these dangerous and damaging fires.

In this Article we show how 3M Scotch® Fire Retardant Electric Arc Proofing Tape 77, can protect low (LV) and medium voltage (MV) electrical cables from electrical arc faults and their resulting fires.

Arc Faults Can Be Catastrophic

Protecting cables From ARC Faults

with 3m scotch 77 tape

3M Scotch 77 Tapes Even after a short exposure to a flame, an unprotected cable will catch fire, and continue to burn. Increasing the likely-hood of causing other fires and causing additional major damage. One fire could wreak absolute havoc on cables, or the equipment they are connecting.

Unless of course you can help prevent them from catching fire in the first place. Scotch fire retardant electric arc proofing tape, is designed to protect Low Voltage and Medium Voltage cables and cable accessories from arc faults and the resulting fires.

3M Scotch 77 tape can withstand a 2000 degree torch blast from 3 inches away, for 3 minutes.

That’s 3 minutes longer than an unprotected cable.

3M Scotch 77 Tapes are 0.76mm thick, arc and fireproofing electrical tapes designed to protect all types of electrical cables. This insulating firewall acts as a heat shield and flame barrier, thus protecting the cables joints and accessories.

Scotch 77 tape is burn resistant.

It will also help prevent cable jacket material from melting and dripping flames onto whatever lies beneath it. When the flame is taken away from a cable protected by 77 tape, that’s it, it doesn’t continue burning. It doesn’t cause additional fires and when the tape is removed, the cable underneath does not show any significant damage, and should not need to be replaced.

That kind of trusted protection is why electrical professionals around the globe have taken notice. Used properly, Scotch brand fire retardant electric arc proofing tape 77, can be the difference between a small problem, and an expensive catastrophe.

Stockists & Suppliers of 3M Scotch Electrical Tapes

SCOTCH 77 Tape

Manufacturer: 3M Electrical
Brand: Scotch Tapes
Stock Code: 3M Scotch 77 Tape
Product Category: Electrical Tapes
Sub Product Category: Corrosion & Fire Protection Tapes
3M Scotch 77 Tape Application: Protects cable from arc and fire until limiting devices can interrupt faulted circuit. Use on high-energy cables that are within 18″ of other high energy cables. Available in black and white the white version is easily visible and easy to inspect
3M Scotch 77 Roll Sizes:
1-1/2″ x 20′ (38 mm x 6,1 m)
3″ x 20′ (76 mm x 6,1 m)

➡ Also available from Thorne & Derrick are Cold Shrink and Scotchcast – contact us for prices and delivery for the 3M Scotchcast range of cable joints and resins.

3M Scotch Electrical Tapes

Self Amalgamating Tapes | Mastic Tapes | Corrosion & Fire Protection Tapes

Thorne & Derrick

Approved Suppliers & Vendors To TfL & London Underground

LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt

Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

How To Repair A Damaged Cable Jacket With 3M Mining Cable Splice Kits 3100 Series

January 10th, 2019

A series of How-To videos for repairing, jointing and terminating cables using 3M Cold Shrink & Scotchcast products.

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

Repairing Mining Cables

This video by 3M Electrical shows how to apply 3M Mining Cable Splice Kits when repairing a damaged cable jacket or sheath.

3M Mining Cable Splice Kits 3100 Series may be used for flexible conduit and cable jacket repairs, as well as for cable splicing and jointing three conductor mine and portable cables, type 3M SHD-GC, MPF GC, and MPF.

The 3M video shows how to repair the damaged cable jacket by using 3M Mining Cable Splice Kits type 3100, 3103 and 3104.

3M Cable Splice Kit 3100

2-Conductor Flat W-Type Cable

Remove the damaged cable jacket and taper the jacket approximately one inch
Scuff and clean three inches of the cable jacket beyond the split end
Bind cable assembly with 3M Temflex Vinyl Electrical Tape 1700P staring one inch above the split or top of the taper
Apply half lap layers of Scotch Brand Linerless Rubber Splicing Tape 130C to one inch past the end of the opposite split or top of the taper
Apply half lap layers filling all voids until the area is returned to greater than or equal to the original cable profile
Start two inches from the 3M Scotch 130C splicing tape and apply one and a half layers of 3M Scotchcast Heavy Duty Mining 31 tape continuing two inches past the end of the 130C tape
Always wrap the Scotch 31 tape towards the machine end of the cable
Start one inch past the 3M 31 Mining Tape and apply three and half lap layers of 3M 1700P to each end to temporary secure the ends of the 31 tape jacket until the jacket reaches full bond

3M Cable Splice Kit 3103

15kV Type SHD-GC Cable

Remove the damaged cable jacket and taper the jacket approximately two inches
Scuff and clean four inches of the cable jacket beyond each split end bundle of the cable assembly and bind with 3M Temflex Vinyl Electrical Tape 1700P tape
Cover the 3M 1700P tape with one half lap layer of Scotch Brand Rubber Mastic Tape 2228
Wrap half lap layers of Scotch Brand Linerless Rubber Splicing Tape 3M 130C building up and across the splice until it is equal to or greater than the original jacket thickness
Extend one inch past the top of the jacket tapers
Start two inches beyond the 130C tape and wrap one half lap layer of 3M Scotchcast Heavy Duty Mining Tape 31 two inches beyond the 130C tape on the opposite end
Always wrap the 3M Scotch 31 tape towards the machine end of the cable. Please Note: for purposes of this video only the MSHA number is not printed on the mining tape Scotch 31
Start one inch past the 31 tape and apply three and half lap layers of 3M 1700P tape to each end to temporarily secure the ends of the Scotch 31 tape jacket until the jacket reaches full bond

3M Cable Splice Kit 3104

2kV Type SHD-GC Cable

Remove the damaged cable jacket and taper the jacket approximately two inches
Scuff and clean four inches of the cable jacket beyond each split end
Bundle the cable assembly and bind with 3M Temflex Vinyl Electrical Tape 1700P
Starting half way up the tapers wrap half lap layers of 3M Scotch Brand 130C Tape building up and across the splice until the taper is equal or greater than the original jacket thickness
Extend pas the top of the jacket tapers
Start two inches beyond the 3M 130C tape and wrap one half lap layers of mining tape Scotch 31 extending two inches beyond the 130C tape on the opposite end
Always wrap the 3M Scotch 31 tape towards the machine end of the cable
Start one inch past the 3M Scotch 31 tape and apply three half lap layers of 3M Scotch 1700P tape to each end to temporarily secure the ends of the Scotch 31 tape jacket until the jacket reaches full bond.

3M Mining Cable Splice Kits 3100 Series

We hope you find this video informative and educational, contact T&D for technical support, quotations and stock availability for 3M Mining Cable Splice Kits .

3M Scotch Tapes

Further details on the complete range of 3M Scotch Electrical Tapes can be found here:

➡ Visit 3M Electrical for further information about joints, terminations, tapes and insulation to seal, repair, splice and connect LV MV HV cables.

3M Electrical Products Stocked By Thorne & Derrick International

3M HDCW 35/10 Wraparound Heat Shrink Cable Repair

October 17th, 2018

3M HDCW 35/10

Product Group: Heat Shrink
Family: Wraparound Heat Shrink Cable Repair
Manufacturer: 3M Electrical
3M Description: 3M HDCW Repair 35/10 – 250mm
3M Reference: HDCW 35/1-25
Stock | Non-Stock: Stock – check with Thorne & Derrick

3M Electrical Stockists Since 1985 ♦ Cold Shrink ♦ Scotchcast Resins ♦ Cable Joints ♦ Cable Terminations 
♦ Scotch Electrical Tapes ♦ Heat Shrink ♦ LV MV HV Cable Accessories

THORNE & DERRICK

LV MV HV Cable Jointing, Earthing, Substation & Electrical Eqpt 11kV 33kV 66kV

Cold Shrink Splices & Cable Jointer Training

August 29th, 2018

Cold Shrink Splices

Image Kind Courtesy : John Perez - Quanta Underground Power Services / A Quanta Company
Words : Chris Dodds - Thorne & Derrick Sales & Marketing Manager

Cold Shrink

The dependability of any proprietary brand of Joint or Termination is dependent upon the skill and competence of the Splicer and ultimately the standard of the Splicer Training provided to that Splicer. Bad pun klaxon……this is a simple fact of Splice.

Since their introduction in the 1970’s, 3M Cold Shrink products, including cable splices and terminations, document exceptional field service history – BUT this failure rate is only as exceptional as those Splicers installing them.

Splicers specialising in the jointing and terminating of MV HV cables require initial work experience, on-the-job mentoring, training and often formal vocational education – training continues throughout the lifetime of the career of a Splicer as new methods and working practices evolve against the backdrop of changes to the types of cable being used.

Our dynamic Splicers with their nerves of steel and the concentration powers of a chess Grandmaster must maintain a steady hand and focussed mind when working their cables – whether strong-arming a PILC cross in a muddy hole knee deep in brown squelch or performing a high-wire terminator act out the back end of a Bucket Truck.

Anyway, here goes those jaw-drop 3M stats 🙂 :

Low failure rates*
– 0.067% for Cold Shrink Cable Splices
– 0.022% for Cold Shrink Cable Terminations

*Data based upon U.S. failure data of U.S. manufactured 3M Cold Shrink Medium Voltage Cable Accessories between 2009 and 2012.

Cable Splices

Here, the trainee Splicers are shown the installation procedure for cable splicing of medium voltage PILC (Paper Insulated Lead Covered) cables – the Cold Shrink cable splice body is positioned on the cable following the preparation of the cable using appropriate jointing tools and prior to the installation of the mechanical shearbolt connectors.

Cold Shrink Splices

Cable Type: MV Medium Voltage PILC 3 Core 15kV Manufactured by CME Wire & Cable.

QS4 Splices & QTIII Terminations

Listen, before the phone calls start these Videos are NOT for Training purposes – so to all the “You Tube Jointers“ watching out there, get real and get trained.

Better still become Competent. Then train some more. Stay Competent. Achieve Manufacturers Certifications – go get trained by Nexans Euromold, Pfisterer and 3M.

Choose your UK Jointer Training Centre with care, especially Live Cable Jointers Courses.

Let’s protect and preserve the reputation of the beautiful Craft of Splicing – like Andy O’ Malley says “build it like you own it.”

Take Pride but above all Take Care. Enjoy the Movies!

…

THORNE & DERRICK SPECIALIST ELECTRICAL DISTRIBUTOR

LV ♦ MV ♦ HV

T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Cable Pulling & Installation Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.

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

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

Cable Joints Glands Cleats Lugs - LV Low Voltage

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

Cable Joints Terminations - MV HV Medium High Voltage

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

3M Scotch Tapes – PVC Vinyl Electrical Tapes

July 26th, 2018

A series of How-To videos for repairing, jointing and terminating cables using 3M Cold Shrink & Scotchcast products.

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

Scotch Tapes

This video by 3M Electrical shows the benefits of 3M Scotch Electrical Tapes.

3M Scotch tapes are used to cable joint, splice, repair damaged cables, seal and protect cables against abrasion, fire and corrosion – this includes protection of LV-HV (11kV-33kV) cables and connections.

Please contact T&D should you require assistance with selecting the correct 3M Scotch tape.

The 3M video explains the benefits of using Scotch electrical tape over alternative tapes.

Extreme Heat or Cold Applications For Scotch Tapes

Watch the video to see how Scotch tapes perform and endure installation and service conditions at temperatures down to 0°F and up to 220°F temperatures with cracking or unwinding. Scotch tapes will not degrade overtime when subject to temperature extremes, weathering, moisture or chemicals.

3M Scotch tapes demonstrate strong adhesion and excellent durability ensuring they are ideal for permanent jobs such as insulating and protecting electrical cable connections – once wound properly it remains wound.

3M Scotch tapes can also be used in zero degree temperatures and withstands high temperature up to 220ºF unlike other vinyl electrical tapes which would crack and unwind.

A greater stretch and tape elasticity provides a smooth, professional wrap and the coloured coded and fade resistant design ensures permanent and clear cable identification using 3M Scotch vinyl electrical tapes.

Scotch Electrical Tapes

Scotch Tapes Manufactured By 3M Electrical For Professionals

The Scotch brand of PVC vinyl electrical tapes, manufactured by 3M Electrical, provide distinct competitive advantages over unbranded poor quality tapes which may have a superficial low price but actual high cost associations – since plastic vinyl tapes hit the mass-market in the 1940’s 3M Scotch has been the choice brand of the professional electrician for tapes with excellent electrical and mechanical properties.

For instance, 3M Scotch Super 33+ is the market-leading “fit and forget” vinyl electrical tape for providing cable protection, insulation and repair in industrial and hazardous area installations – this includes chemical (resists acids and alkalies), offshore (resists abrasion and corrosion) and industrial outdoor (resists UV ultraviolet light) applications.

As standard Scotch 33+ is coloured black so for colour-coding, phase marking and identification applications go with 3M Scotch 35 – same product specification as Scotch 33+ but with a colour spectrum of red, yellow, blue, brown, grey, white, green, orange and violet.

For cold weather and extreme low temperature applications select 3M Scotch 88 for continuous service down to 0 Degrees Celsius – Scotch 88 by 3M features excellent pliability and adhesion.

A varnished cambric tape is “off-the-shelf” for high puncture and cut-through resistance with Class A thermal stability – contact sales and ask about 3M Scotch 2510 for further information.

The protection of medium/high voltage cables and joints demands heavy-duty electrical tapes – substandard and under specified tapes pose risk and danger to power systems and life. Here, upgrade your tape choice to 3M Scotch 22, recommended by 3M Electrical for outer sheath and cable jacket protection or repairs to high voltage power cables and joints with rubber or polymeric cables. That’s XLPE and EPR in “cables-speak”.

Where cost is King but a good quality and general purpose PVC electrical tape is required contact us to place an order for 3M Temflex 1500.

All 3M Electrical Tapes are super stretch and strong for holding power in place without fail.

Due to the physical properties of 3M Scotch the tapes provide moisture-tight, chemical resistant electrical sealing of cables, connections and cable joints.

So overall, Thorne & Derrick distribute an extensive range of electrical tapes including fire proofing tapes with arc protection, see 3M Scotch 77 and high specification fire resistant tapes manufactured by Nexans.