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|IEC voltage range||AC||DC||defining risk|
|High voltage (supply system)||> 1000 Vrms||> 1500 V||electrical arcing|
|Low voltage (supply system)||50–1000 Vrms||120–1500 V||electrical shock|
|Extra-low voltage (supply system)||< 50 Vrms||< 120 V||low risk|
Low voltage, when used as an electrical engineering term concerning an electricity supply grid or industrial use, broadly identifies safety considerations of the system based on the voltage used. The meaning of the term "low voltage" is somewhat different when used with regard to a more typical end user's distribution system, which see below.
With regard to an electricity supply system, 'low voltage' most commonly refers to mains voltage. "Low voltage" in this context is characterized by carrying a substantial risk of electric shock, but only a minor risk of electric arcs through air. Also in this context, "Low voltage" is distinguished from:
Some other commonly used definitions include: