shall be separated at least 4 inches (102 mm) from electric light or power conductors not in a raceway or cable, or be permanently

separated from conductors of the other system by a continuous and firmly fixed nonconductor in addition to the insulation on the wires, such as porcelain tubes or flexible tubing. Communications wires and cables in accordance with Section 800-12(a) exposed to accidental contact with electric light and power conductors operating at over 300 volts to ground and attached to buildings shall be separated from woodwork by being supported on glass, porcelain, or other insulating material. Exception: Separation from woodwork shall not be required where fuses are omitted as provided for in Section 800-31(a), or where conductors are used to extend circuits to a building from a cable having a grounded metal sheath. (c) Entering Buildings. Where a primary protector is installed inside the building, the communications wires and cables shall enter the building either through a noncombustible, nonabsorbent insulating bushing, or through a metal raceway. The insulating bushing shall not be required where the entering communications wires and cables (1) are in metalsheathed cable; (2) pass through masonry; (3) meet the requirements of