In the installation of EMT, the insulated EGC must be bonded to each 4"-Square box. What is the requirement?

In the context of installing EMT (Electrical Metallic Tubing), bonding the insulated Equipment Grounding Conductor (EGC) to each 4"-Square box is essential for ensuring safety and compliance with electrical codes. The grounding system provides a low-resistance path to the ground, which helps to prevent electrical shock hazards and equipment damage in the event of a fault.

The requirement to bond the EGC is based on the need to maintain electrical continuity and safety throughout the system. Bonding the insulated EGC to each box helps ensure that any fault current can be effectively directed to the ground, reducing the risk of shock to users and protecting connected equipment from damage.

This bonding ensures that all metal boxes are at the same electrical potential as the rest of the grounding system, which contributes to the overall safety of the electrical installation. By requiring this bond, the installation helps ensure compliance with relevant electrical standards and codes meant to protect both users and the electrical system itself.