All metal items that enter a bathroom from outside of the room (e.g. copper pipes, electric circuit cables) are connected together using 4mm² green/yellow insulated wire. Connection is also made to each of the protective earth wires in each circuit that feeds an appliance in the …
When youre doing wiring installation, you need to identify the parts of the wiring cable, the nonmetallic electrical cable the outer sheathing (the jacket) and the inner wires. The colored wire you see—the green, black, red, blue or white—is actually the sheathing that covers the inner copper wires.
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