(IEC) is attempting to harmonise wiring standards among member countries, but significant variations in design and installation requirements still exist.

Wiring methods

Materials for wiring interior electrical systems in buildings vary depending on:
* Intended use and amount of power demand on the circuit
* Type of occupancy and size of the building
* National and local regulations
* Environment in which the wiring must operate.

Wiring systems in a single family home or duplex, for example, are simple,

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