A grounded service entrance conductor must not connect to which part of the round boxes?

The connection of a grounded service entrance conductor is critical for ensuring safety and compliance with electrical codes. In this context, the top of a round box is typically where the wiring enters the box. Grounded conductors should be properly terminated to prevent any potential hazards, such as accidental disengagement, which can occur if the conductor is routed improperly.

Connecting the grounded service entrance conductor to the side of the round box is permitted, as this does not interfere with the safe operation of the box or its accessibility for maintenance. Conversely, the bottom can also accommodate connections without issue. However, having the conductor attached to the side or bottom prevents it from being exposed to accidental disconnection that may occur if it is routed through or connected at the top, given that this is often where other wires enter or where strain could be applied during installation or maintenance.

Therefore, avoiding a connection to the side helps maintain the integrity of the entire electrical system and ensures that the grounded service entrance conductor is securely and effectively connected, aligning with safety protocols.