Low Voltage - Electrical Power Supply Industry Definitions

Electrical Power Supply Industry Definitions

In the electrical power supply industry, 'low voltage' most commonly refers to mains voltage or power transmission lines. "Low voltage" in this context still presents a risk of electric shock, but only a minor risk of electric arcs through the air.

The International Electrotechnical Commission (IEC) defines supply system low voltage as voltage in the range 50–1000 V AC or 120–1500 V DC.

  • British Standard BS 7671:2008 defines supply system low voltage as:
50–1000 V AC or 120–1500 V ripple-free DC between conductors;
50–600 V AC or 120–900 V ripple-free DC between conductors and Earth.

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