The International Electro-technical Commission
(IEC), define low voltage circuits as those with 50 – 1000 Volts for
alternating current and at least 120 – 1500 Volts for direct current,
and distinguish it from extra low voltage (<50 V AC or < 120 V DC)
circuits. This is in the context of building wiring and the safety of
Low-voltage consumers are, by definition,
those consumers whose loads can be satisfactorily supplied from the
low-voltage system in their locality.