plastic types, are typically used as enclosures for splicing or terminating telephone cables.
FPN No. 2: This section limits the length of unlisted outside plant cable to 15 m (50 ft), while 800.90(B) requires that the primary protector be located as close as practicable to the point at which the cable enters the building. Therefore, in installations requiring a primary protector, the outside plant cable may not be permitted to extend 15 m (50 ft) into the building if it is practicable to place the primary protector closer than 15 m (50 ft) to the entrance point
FPN No. 3: See 800.2 for the definition of Point of

Entrance.

800.50 Circuits Requiring Primary Protectors. Circuits that require primary protectors as provided in 800.90 shall comply with 800.50(A), (B), and (C).

(A) Insulation, Wires, and Cables. Communications wires and cables without a metallic shield, running from the last outdoor support to the primary protector, shall be listed in accordance with 800.173.

(B) On Buildings. Communications wires and cables in accordance with 800.50(A) shall be separated at least

100 mm (4 in.) 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 800.50(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 re-

quired where fuses are omitted as provided for in

800.90(A)(1), 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 in- stalled inside the building, the communications wires and cables shall enter the building either through a noncombus-tible, 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 metal-sheathed cable, (2) pass through masonry, (3) meet the requirements of
800.50(A) and fuses are omitted as provided in
800.90(A)(1), or (4) meet the requirements of 800.50(A)
and are used to extend circuits to a building from a
cable having a grounded metallic sheath. Raceways or
bushings shall slope upward from the outside or, where
this cannot be done, drip loops shall be formed in the
communications wires and cables immediately before
they enter the building.
Raceways shall be equipped with an approved service head. More than one communications wire and cable shall be permitted to enter through a single raceway or bushing. Conduits or other metal raceways located ahead of the primary protector shall be grounded.
800.53 Lightning Conductors. Where practicable, a separation of at least 1.8 m (6 ft) shall be maintained between communications wires and cables on buildings and lightning conductors.

III. Protection

800.90 Protective Devices.
(A) Application. A listed primary protector shall