Square D Spa Pack Wiring Diagram. Ground fault circuit interruptors gfci wiring installation. Wiring a four poles rcbo or gfci circuit breaker (three phase rccb wiring) the three phase wiring for gfci or rcd (rccb) or rcbo wiring diagram shows the three lines (l1, l2 and l3) and neutral has been connected as input to the rccb from main board followed by mcb i.e.

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