Intersystem Bonding Termination or Grounding Means. If the build- ing or structure served has no intersystem bonding termination or grounding means, as described in
770.100(B)(2), the grounding conductor shall be connected to either of the following:
(1) To any one of the individual electrodes described in
250.52(A)(1), (A)(2), (A)(3), or (A)(4).
If the building or structure served has no grounding
means, as described in 770.100(B)(2) or (B)(3)(l), to
an effectively grounded metal structure or to a
ground rod or pipe not less than 1.5 m (5 ft) in
length and 12.7 mm (in.) in diameter, driven, where
practicable, into permanently damp earth and
separated from lightning conductors as covered in
800.53 and at least 1.8 m (6 ft) from electrodes of
other systems. Steam or hot water pipes or air
terminal conductors (lightning-rod conductors) shall
not be employed as electrodes for protectors.
(C) Electrode Connection. Connections to grounding electrodes shall comply with 250.70.
(D) Bonding of Electrodes. A bonding jumper not smaller than 6 AWG copper or equivalent shall be connected between the grounding electrode and power grounding electrode system at the building or structure
served where separate electrodes are used.
Exception: At mobile homes as covered in 770.106.
FPN No. 1: See 250.60 for use of air terminals
(lightning rods).
FPN No. 2: Bonding together of all separate electrodes limits potential differences between them and between their associated wiring systems.
770.101 Grounding. Non-current-carrying conductive members of optical fiber cables shall be grounded according to the grounding methods specified by
770.100.
770.106 Grounding of Entrance Cables at Mobile Homes. Where grounded as required by 770.100 at a mobile home, the non-current-carrying metallic members of optical fiber cables entering buildings shall be grounded as specified in 770.106(A) and (B).
(A) Grounding. Where there is no mobile home service equipment located within 9.0 m (30 ft) from the exterior wall of the mobile home it serves, or there is no mobile home disconnecting means grounded in accordance with 250.32 and located within 9.0 m (30 ft) from the exterior wall of the mobile home it serves, the ground for non-current-carrying metallic members of optical fiber cables entering buildings shall be in accordance with 770.100(B)(3).
(B) Bonding. The primary protector grounding terminal or grounding electrode shall be bonded to the metal frame or available grounding terminal of the mobile home with a copper grounding conductor not smaller than 12 AWG under either of the following conditions:
(1) Where there is no mobile home service equipment or disconnecting means as in 770.106(A)
(2) Where the mobile home is supplied by cord and plug