The incoming live wires, also called phase or hot wires, should be connected to the line terminals of the circuit breakers in the secondary distribution box. Each breaker controls a specific circuit, and the live wire provides the primary electrical energy to that circuit. For single-phase circuits, a single-pole breaker (1P) is used, while for circuits requiring both live and neutral disconnection, a double-pole breaker (2P) is used . Wire colors typically follow standard coding: yellow for phase A, green for phase B, and red for phase C .
Neutral wires should be connected to the neutral busbar inside the distribution box. In a subpanel, the neutral busbar must not be bonded to the ground busbar; this separation prevents unwanted current flow through the grounding system and complies with NEC regulations . For single-pole breakers, the neutral bypasses the breaker and connects directly to the neutral busbar, while for double-pole breakers, the neutral is connected to the breaker according to its markings .
Ground wires (PE) must be connected to the ground busbar in the distribution box. This busbar is linked to the building's grounding system, providing a safe path for fault currents. If the breakers include residual current protection (RCDs), the PE wire may also connect to the breaker's dedicated terminal .
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