A “3-wire” 220v line, has 2 insulated copper wires and 1 bare copper wire.  A “4-wire” 220v line would have 3 insulated copper conductors and 1 bare copper conductor.  Difference […]

The wire color code is a very important thing to note. Especially for electricians, electrical engineers, technicians and even regulars. Installation standards and guidelines for wiring are designed to protect […]