What procedure must be completed for each receptacle to the metal box?

The procedure that must be completed for each receptacle to the metal box is grounding. Grounding is crucial in electrical installations as it provides a safe path for electrical current to flow in case of a fault. This helps to prevent electric shock or fire hazards.

When a receptacle is installed in a metal box, it is vital to connect the grounding terminal of the receptacle to the metal box. The metal box itself should also be grounded to ensure that any fault current is effectively routed to the ground, thus protecting users from electrical hazards. This grounding connection is typically made using a green or bare copper wire, which connects to the grounding screw on the receptacle and is attached to the box to ensure a continuous ground path.

Understanding the significance of grounding is essential in electrical work because it enhances safety for both the equipment and the users. It is an integral part of meeting safety codes and regulations that govern electrical installations.