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Answer Posted / soumendasbiswas
British Standard BS 7671:2008 defines 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.
The International Electrotechnical Commission and its
national counterparts (IET, IEEE, VDE, etc.) define high
voltage circuits as those with more than 1000 V for
alternating current and at least 1500 V for direct current.
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