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What is the main grounding point of the distribution box called

The grounding point of a distribution box is called a grounding bar, PE bar, or earth bar.

Inside a distribution box, the grounding point serves as the connection for all protective earth (PE) conductors, ensuring safety by providing a low-impedance path for fault currents to return to the source and trigger protective devices like circuit breakers or RCDs . It is typically a conductive bar or terminal assembly, often labeled as PE (Protective Earth) or earth bar, and is bonded to the metal enclosure of the box .

Function and Connection

The grounding bar connects:

  • Incoming ground wires from the power supply.
  • Grounding wires from electrical components inside the distribution box.
  • The box enclosure itself, ensuring all exposed conductive parts are at the same potential . During installation, a yellow-green insulated copper wire is commonly used to connect devices to the PE bar, and the connection must be secure to maintain effective grounding . In main service panels, the neutral and ground may be bonded at a designated point, but in subpanels, the neutral bar is usually isolated while the PE bar remains bonded to the enclosure .
Terminology

Depending on regional standards:

  • IEC/International: PE bar, earth bar.
  • North America: Ground bar, equipment grounding bar.
  • Function: Provides a protective path for fault currents, not for normal load current . This grounding point is essential for electrical safety, preventing electric shock and ensuring that protective devices operate correctly during faults .
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