Where raceways contain insulated circuit conductors of which AWG size and larger, must they be protected from abrasion during and after installation?

The requirement for raceways that contain insulated circuit conductors of a certain American Wire Gauge (AWG) size and larger to be protected from abrasion stems from safety and durability standards in electrical installations. Specifically, raceways must ensure that conductors are shielded against physical harm that could potentially expose them, leading to short circuits or electrical failures.

When insulated conductors are sized at AWG 4 and larger, they generate a greater amount of heat and are often used in higher-current applications. This necessitates enhanced protective measures. The use of raceways helps in managing the risk of mechanical damage, particularly in areas subject to abrasion from contacting surfaces, equipment, or environmental factors.

This standard reflects the balance between providing adequate protection for conductors and maintaining compliance with applicable codes and regulations. Conductors that are smaller than AWG 4 typically do not face the same level of strain or risk, hence they may not require the same rigorous protections as those thicker conductors.

The emphasis on AWG 4 specifically illustrates the recognition of both the physical properties of the wire itself and the potential consequences of insufficient protection against abrasions, making it the benchmark for where additional protective measures are mandated.