UK Cable Size Calculator

Indicative cable sizing for 70°C thermoplastic (T&E) cable. Enter your design current, choose an installation method, ambient temperature and number of grouped circuits, and get a suggested minimum cable CSA — a quick on-site sanity check, not a replacement for the full BS 7671 tables.

UK Cable Size Calculator

Indicative sizing for 70°C thermoplastic (T&E) cable.

Design current, Ib (A)

Installation method

Ambient temperature

Circuits grouped together

Indicative only — always verify against the current BS 7671 tables, and check voltage drop and Zs separately for the final circuit design.

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