What kind of protection is required between conductors and armor in armored cable?

The requirement for an insulating bushing between conductors and the armor in armored cable is primarily to provide a barrier that prevents potential electrical shorts or damage to the conductors. Armored cable, while offering physical protection, can be abrasive to the insulation of the individual conductors it contains. An insulating bushing serves to shield the conductors from the metal armor, ensuring that the insulation does not wear away due to contact with sharp edges or movement.

This practice is crucial for maintaining the integrity of the electrical system and to comply with safety codes. Proper insulation helps to avoid failures that could lead to short circuits or even fire hazards. While other methods, like heat-shrink tubing or electrical tape, might provide some level of protection, they do not fulfill the specific code requirements outlined for armored cables as effectively as an insulating bushing does. Thus, using an insulating bushing ensures compliance with safety standards and prolongs the life of the cable installation.