Electrical wiring colour codes red which color colours ve dc rail 0v power electronics wikipedia info article here stack Electrical, heating and control products: meltric decontactors voltage 120vac wiring wire volt
wiring - Red for +ve, black for 0v,which colour for -ve rail
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Electrical, Heating and Control Products: Meltric deContactors Voltage
120vac Color Code
wiring - Red for +ve, black for 0v,which colour for -ve rail