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May 3, 2024 · Sorry for this wall of text, I tried to keep this short but it''s not easy. There are other ways to handle electrical system grounding (aka earthing), and other countries do it differently
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Residual Current Breaker with Overcurrent Switch off the main circuit breaker to ensure the power supply is OFF before wiring a GFCI outlet. Use the suitable voltage and ampere rating of the switch with the appropriate wire size and proper size MCB according to the load rating.
Similar to the wiring diagram for a 1-pole GFCI circuit breaker, the built-in white wire on the back of the two-pole GFCI must be connected to the neutral bar in the main panel. The 2-pole GFCI should be installed in the two hot slots in the main panel. This configuration allows HOT 1 and HOT 2 to provide the 240V input supply to the GFCI.
Keep in mind that the difference between single-pole and two-pole normal circuit breakers and a GFCI is that there is a built-in white wire on the backside of the GFCI, and it must be connected to the neutral busbar in the main supply, or it will not work and protect the circuit properly.
A Ground-Fault Circuit Interrupter (GFCI) is a safety device designed to protect people from electrical shock by monitoring the electrical current flowing through a circuit. It detects imbalances between the hot and neutral wires, which can indicate a ground fault where electricity is leaking out of the circuit.
The two output line wires (HOT 1 and HOT 2) from the GFCI are connected to the line terminals (L1 and L2) of the 20A, 240V outlet/receptacle. Finally, the ground wire from the ground terminal bar is connected to the ground screw on the outlet. This setup ensures that the 20A, 240V outlet is protected by the 20A GFCI circuit breaker.
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