11kV 33kV | Medium & High Voltage Cables

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

Cable abandonment kits can be supplied for medium/high voltage cables if the cables are left in the ground but aren’t energised. From the outside, they look similar to live pot end kits, but internally, the phase or phases are connected to earth so that if a voltage is applied to the cables by mistake, an immediate earth fault occurs which trips the circuit breaker.

Please Note: The following Jointing Instructions should be used by a trained competent cable jointer only – contact us to discuss the availability of Cable Jointer Training Courses.

A Jointers gas torch is preferred method for heat shrinking these materials making sure all tubes and materials are kept clean, dry and are free from dust, sand or grease.

In the following post we reproduce the Cable Abandonment Kit installation instruction – should you have any questions or queries please do not hesitate to contact us.

See also:

• Pot End Live Cable End Seal | 11kV Cables Single Core XLPE CWS
• Pot End Live Cable End Seal | 11kV Cables 3 Core XLPE EPR

MV HV Cable Abandonment

XLPE EPR Insulated Power Cables 11kV 33kV

Abandonment kits can be kitted from stock using heat shrink tubes to suit 11kV/33kV medium and high voltage cables with polyermic (XLPE EPR) or paper insulation (PILC) – single or 3 core cables accommodated with wire armour (SWA AWA), wire braid (PBSB GSWB) and lead cover sheaths.

1. Remove the outer cable jacket using appropriate sheath stripping tools and expose approximately 100mm of the inner cable bedding with the cable cores beneath.

2. If cable is armoured (SWA) or has a braid screen, expose the cable armour wires or screen to the length of the armour support ring. Fit the support ring as shown in Fig 2.

3. As shown in Fig 2, position the copper earth braid upon each conductor and hammer a nail through the braid so that it is held securely in place. Do this on each core with the same copper earth braid.

Note: if solid aluminium conductor, remove some insulation on each core and use the copper mesh supplied to wrap around the MV HV cable conductors before taking this back to the armour wires.

4. Wrap copper mesh all around the cable and secure along with the earth braid to the armour wires/braid screen with the worm drive clamp or constant force roll spring supplied as shown above in Fig 3. Apply black mastic tape over any sharp points.

Note: if non armoured cable and if specified, the cable abandonment kit can be supplied with a copper strap to bond to earth externally. Position the solder block on a turn of mastic tape and apply a further turn of tape as shown above in Fig 3.

5.Position the heatshrink end cap over the cable and using a suitable heat source, heat shrink the cap into position.

If the cap does not cover the exposed earthing, position the additional heat shrink tube and shrink so that it overlaps onto the outer cable sheath and onto the cable end cap.

Note: clean and abrade the outer cable jacket before fitting.

6. Additional green heatshrink sleeve can be supplied to fit onto the outside of the cable abandonment kit to comply with DNO specifications. Trim before fitting if necessary.

Low Voltage Cable Abandonment Using 3M Cold Shrink

For the abandonment of LV power and instrumentation cables located both onshore and offshore we can recommend 3M Cold Shrink cable abandonment kits.

Cable Abandonment Using Cold Shrink

Thorne & Derrick – Stockists & Suppliers of MV HV Joints, Terminations & Connectors

THORNE & DERRICK are national distributors MV & HV Cable Jointing, Substation Earthing & Cable Installations –  we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

LV Cable Accessory Distributors

T&D stock and supply cable accessories to Cable Cleat, Gland, Joint & Terminate armoured/unarmoured multicore (SWA) or single core (AWA) power cables into low and high voltage substations – the LV cable installation accessories support electricity distribution to main distribution switchgear, sub-distribution boards and transformers.

➡ How To Abandon Cables Using 3M Cold Shrink Cable Abandonment Kits CSCAK

CMP Glands | 3M Joints | Cembre Lugs | Ellis Cleats | LV Cable Accessories

Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.

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

Cold Shrink

This video by 3M Electrical shows the benefits of using 3M Cold Shrink compared to heat shrink cable accessories to insulate, joint, repair and terminate cables.

3M cold shrink tubes utilise a unique cold applied delivery system which is designed to make cable jointing, insulating, termination and abandonment as simple as possible without any of the inherent workplace risks associated with “hot-working” and using naked flames to activate heat shrink type cable accessories.

Cold shrink reduces the risk of damaging XLPE cable insulation caused by scorching or over-heating of the cable by the jointer. No cooling time is required before energising cables.

Cold Shrink Benefits

Installation is fast and an easy one-step installation process:

• Labour Savings – enables installation of cable accessory in 1/3 of the time or less compared to heat shrink equivalents
• Tooling – no special heating tools or “hot-work” work permits required
• Compact – smooth profile cold shrink limits volume displacement on cable tray where congregated cable joints are located
• Outdoor – resistant to weathering for continued outdoor service in environmental and exposed locations
• User Friendly – easy to learn and train with less installation steps
• More Cold Shrink Videos | Cable Abandonment | Cable Terminations MV HV

➡ See How To Use Cold Shrink Tubes.  

3M Tubes – available in EPDM Rubber or Silicone

Depending on the application cold shrink is available manufactured in EPDM Rubber or Silicone – contact us to discuss your application.

Cold Shrink creates a static and stable cable seal that does not expand or contract with the cable under thermal cycling of LV-HV cables, potentially leading to the creation of voids between the cable accessory and the cable which could lead to a joint or termination failure.

Cold Shrink – invented by 3M over 40 years ago and now the preferred technology for heat-free jointing, terminating, sealing and abandonment of LV HV cables

We hope you find this video informative and educational, contact T&D for technical support, quotations and stock availability for 3M Cold Shrink.

Trust Cold Shrink

• Low Cable Failure Rates*:
  – 0.067% for Cold Shrink Cable Joints & Cable Splices
  – 0.022% for Cold Shrink Terminations

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

3M

Should you require support about selecting the correct 3M Cold Shrink product range for use with low, medium or high voltage cables please contact us – a complete range of Cold Shrink cable joints and terminations is available for MV-HV cables, including 11kV/33kV.

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

Cold Shrink | Joint | Terminate | Seal | Repair | Splice | LV MV HV Cables | 3M

• 3M Electrical Products Stocked By Thorne & Derrick International 

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

How To Abandon Cables

Low Voltage Polymeric Cables up to 3.3kV

This video by 3M Electrical shows how to abandon cables safely using 3M CSCAK Cable Abandonment Kits.

3M CSCAK cold shrink cable abandonment kits are used to temporarily or permanently seal power, control and instrumentation cables – especially the abandonment of redundant or decommissioned low voltage offshore, marine and shipwiring power, control and instrumentation cables.

3M CSCAK kits are complete with all components to provide temporary or permanent abandonment of cables – this ensures cables are safe even if re-energised using cold shrink end caps and pre-stretched tubes.

The 3M Electrical video explains how cables are effectively short circuited using 3M Scotch Electrical Tapes and earthing products, including Scotch 24 and constant force springs.

The 3M Electrical video also shows the “live memory” action of Cold Shrink providing reliable and durable cable end seals without need for “hot working” permits in potentially explosive atmospheres or hazardous area zones located onshore and offshore.

Cold Shrink – invented by 3M over 40 years ago and now the preferred technology for heat-free jointing, terminating, sealing and abandonment of LV HV cables

Watch Video  ➡ 

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

Cable Abandonment Kit Selection Table

Should you require support about selecting the correct cable abandonment kit from the 3M Cold Shrink product range for use with low, medium or high voltage cables please contact us – a complete range of Cold Shrink cable joints and terminations is available for MV-HV cables, including 11kV/33kV.

Where additional mechanical protection for connecting underground power cables in cable trench is required we can recommend Scotchcast cable joints with resin encapsulation to resist impact damage during backfill or future excavation and digging works.

For jointing cables in hazardous area locations go to our Blog about ATEX cable joints utilising advanced specification Scotchcast resins to provide a hydro carbon resistant joint or repair to damaged or extended cable circuits.

➡ Cable Abandonment For HV Cables Including 11kV 33kV High Voltages

Cable Abandonment Using Cold Shrink

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

Cold Shrink | Joint | Terminate | Seal | Repair | Splice | LV MV HV Cables | 3M

• 3M Electrical Products Stocked By Thorne & Derrick International