A 4 core cable may be used to create 4-wire circuits for electrical applications. For instance, one very common use of 4 core electric cable is in wiring two-way light switches using a 4-wire circuit, at the top and at the bottom of a staircase in a house.
An electrician might use 4 core 1 mm cable to wire two full electrical circuits. There’ll be one circuit in each direction that provide low cross-interference and deliver full-duplex lighting. Using a 4 core cable in this application allows people in the home to turn the light on and off from either switch, at the top of the stairs or at the bottom, independently.
Other 4 core cable uses might include external applications. For instance, a 4 core shielded cable is ideal to deliver power to external installations and equipment. If a homeowner wanted to deliver power from the main building to an outside shed, using a 4 core 1.5mm cable might be a great way to accomplish that objective.
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