FAQ: How are cable sizes selected

Cable size selection is based on three main factors:

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The current carrying capacity is primarily determined by the conductor size and the thermal heating properties of the cable. Relevant factors such as cable spacing, the specific application, and the insulation materials used play a critical role in the dissipation of heat.

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Although voltage regulation issues are typically minimized in well-designed electrical systems, the potential voltage drop associated with long cable runs must be considered.

Guidance on selecting the appropriate cable size based on various temperature ratings and wiring methods, as well as advice on calculating voltage drops, can be found in the National Wiring regulations (for the UK, known as BS7671 18th Edition).

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