Angle steel for grounding electrode of distribution box

Angle steel can serve as a grounding electrode in a distribution box if properly bonded and connected with suitable conductors to ensure low-resistance grounding.

Purpose of Grounding

The grounding electrode provides a low-impedance path for fault currents and ensures that all metallic parts of the distribution system are at the same electrical potential, reducing the risk of electric shock and equipment damage ( ). In a distribution box, grounding also helps divert transient voltages, such as lightning surges, safely into the earth. Using Angle Steel as a Grounding ElectrodeAngle steel, when used as a grounding electrode, must be electrically continuous, free of non-conductive coatings, and properly bonded to the distribution box and the main grounding system ( ).

The steel should be securely mounted and connected to the mounting plate or threaded studs inside the distribution box using a suitable connector or clamp ( ).

Conductor Sizing

In the US, a 10 AWG (5. 26 mm²) bare copper wire is typically used for grounding inside the distribution box. In other markets, a 6 mm² conductor is recommended ( ).

For connections between the angle steel electrode and the distribution box, ensure the conductor is mechanically secure and electrically continuous. The total ground resistance between all system parts should be less than 0. 1 ohm to ensure effective grounding ( ).

Installation Considerations

Bonding: Connect the angle steel to the distribution box mounting plate, and then from the plate to the central grounding point. This ensures all metallic parts are at the same potential ( ). Supplemental Electrodes: If the resistance of the angle steel electrode is high, additional electrodes such as rods or plates may be installed to achieve the recommended grounding resistance (