When running insulated conductors that enter a box, which gauge creates a requirement for additional protection?

When insulated conductors enter a box, the National Electrical Code (NEC) has specific requirements in place to ensure safety and protection of the conductors. When the size of the conductors is 4 AWG or larger, additional protection measures become necessary due to the potential for the conductors to be subject to physical damage.

Conductors of this larger size carry significant current and have a notable thickness of insulation. Due to their size, they can create risks if not properly protected, especially when they transition from conduit to the box. This is why the NEC requires that conductors 4 AWG and larger must be protected at entry points into boxes to prevent abrasion or damage that could lead to electrical hazards such as shorts or fires.

The additional protection can come in the form of protective devices, like conduit connectors or appropriate strain relief, which help to maintain the integrity of the wiring. Such measures are crucial in ensuring that these larger conductors are safely managed within the electrical installation.