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Ava Mitchell——Studied at Massachusetts Institute of Technology (MIT), Lives in Cambridge, MA
Blue, previously used as a phase colour, is now the colour for neutral. Black, which was previously used for neutral, now indicates a phase. Household wiring does not usually use three-phase supplies and the clash only occurs in three-phase systems. Wiring to the old standard can be detected by use of a red wire.read more >>+119962023-05-15 06:30:56
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