Damage to electrical wiring from drilling into walls is a surprisingly frequent phenomenon – especially when buildings are being renovated. Not only do the lights go out, but you usually blow a fuse as well. With a bit of luck, you might only have to repair the cable sheath. But if you damaged or severed a wire, just using a terminal strip, insulation egs products and some silicone sealant are not recommended – you need some professional kit!

Please note: In general, electrical power cables in the wall or cavities most likely run vertically and horizontally from switches and sockets. If you suspect that an electric cable has been hit, it is absolutely necessary to repair it. You should immediately ensure that the power is switched off before touching anything. In the worst case, if the protective earth conductor has been damaged you otherwise run the risk of a fatal electric shock.
HellermannTyton‘s answer to the question how best to repair an electric cable that has been damaged is the LVRK Cable Repair Set for low-voltage wires. The handy pack contains everything you need to safely repair electrical wires that have been hit by a drill or severed by cutters or a blade. It’s a space-saving solution, too. There’s no need to pull new cables or channel out a large cavity to install a flush mount junction box. And experts have been advising against using conventional terminal boxes for a while now.The cable repair set includes a 200 mm an adhesive-lined heat shrink tube, five crimp butt connectors with heat shrinking insulation for 1.5 mm2 – 2.5 mm2 wire cross-sections plus four heat-stabilised Q-series cable ties with their unique open head and pre-locking function for easy handling.
The LVRK Cable Repair Set makes it possible to repair damaged cables and wires in electrical installations quickly and safely. Damage to cable sheaths or wires can be repaired safely, durably and quickly. In most cases it is not necessary to set flush mount junction boxes or pull new cables.

As a rule, liability insurance pays the damage. However, in the case of negligent action, exceptions may occur. A record of where the wiring is installed or a device for detecting wires and pipes can help you prevent mishaps occurring. However, don’t rely on it 100 %. Only drill where really necessary and exercise extreme caution.