LPT2: high voltage power cable structure

LPT2: high voltage power cable structure

^ diagram of cable cross section

These thick cables are about 150mm in diameter and carry a high-voltage current way down the power tunnels that extend through south London. They are similar in design to those carried by power lines that stretch across the countryside. High voltage, but low current, results in minimal power loss and overheating.

Six cables run through the tunnel, as part of two circuit systems.

The total tunnelling length is about 32km, which means about 200km of cables must be installed during the project. This requires heavy lifting machinery, with the cables weighing about 50kg per metre.

Installation of cables will be via a monorail that runs along the tunnel ceiling.

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