How To Repair Damaged Armoured Power Cables

Published 01 Oct 2018

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

Cable Repair Kits | LV Low Voltage | Heat Shrink Wraparound Kits By 3M

The following damaged cables were identified in a works rectification report for the site subcontractor to remedy and repair – repairing damaged cables is not uncommon where often complex cable configurations and large diameter power cables must be installed or pulled onto containment or into trench under pressure from working conditions on site.

The BS5467 power cables form part of the gantry supplies to a LV cable installation of a building service project where work access was confined to a restricted corridor area.

The damaged low voltage feeder cables were classified as non-conformant by the Electrical Manager due to the sheath damage and consequent exposure of the armoured power cables to moisture or contaminants  – the root cause analysis attributed “bad supervision” as the reason for the cable damage and better management of cable installation methods required to prevent reoccurrence.

The confirmed corrective action was to re-instate the cable sheath and repair the damaged cables using heat shrink cable repair kits manufactured by 3M Electrical – the versatile and reliable wraparound repair kits permit immediate repair of nicks, slits and tears to cable sheaths onsite without resort to replace or disconnect the power cable supply.

Where “hot-working” is disallowed and access to a disconnected cable circuit is feasible the tubular cold shrink repair sleeve could be used – heat shrink is a layflat design which effectively “wraps around” the damaged cable section and is then sealed and closed using the provided fixing channel and rail.

Where the inflicted cable damage has penetrated into the wires of the armoured cables we recommend you review our range of armoured cable joints.

Pictured: Damaged BS5467 XLPE Insulated, SWA Armoured Power Cables 4 Core 120sqmm Stranded Copper Conductors

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