Section 114.099. Additional requirements for grounding and bonding of communication apparatus.

  [NESC 099, p. 33] (Change and Addition)

(1)  Change title 099 to read:

Additional requirements for grounding and bonding of communication apparatus and transmission lines.

(2)   (Change) Change paragraph C to read:

C. Bonding of electrodes

A bond not smaller than AWG No. 6 copper or equivalent shall be placed between the communication grounding electrode and the supply system neutral grounding electrode where separate electrodes are used at the structure or building being served. All separate electrodes shall be bonded together except where separation is required per Rule 97. Bonding to other systems shall not be done on or within a metering enclosure unless a means of bonding, intended for inter-system bonding, is furnished as part of the metering enclosure.

Recommendation: If water piping is used as a bonding means, care must be taken to assure that the metallic path is continuous between electrodes.

Note 1: See NEC Article 800-100(D) for corresponding NEC requirements.

Note 2: The bonding together of all separate electrodes limits potential differences between them and between their associated wiring systems.

(3)   (Addition) [Follows NESC 099C, p. 34] Add paragraph D to read:

D. Transmission shield wire systems and transmission systems with under-built multi-grounded distribution systems

1. The shield wire system providing lightning protection for transmission lines (69 kV phase-to-phase and greater) shall be connected to a made or existing grounding electrode at every transmission pole or structure for each shield wire.

(a) If the transmission line has any under-built distribution attached to the same pole or structure, the shield wire system shall be bonded to the grounding conductor of the distribution neutral at each pole or structure.

(b) The under-built distribution neutral may be connected to its own made or existing ground electrode at each pole or structure.

Exception: Shield wires that are segmented and isolated from ground at a particular pole or structure need not follow this rule.

2. The shield wire of the transmission system shall not be used as the distribution neutral conductor in lieu of the installed distribution neutral conductor.

CR 07-021 : cr. Register January 2008 No. 625 , eff. 2-1-08; CR 13-039 : r. and recr. Register June 2014 No. 702 , eff. 7-1-14; number (1) to (3) under s. 13.92 (4) (b) 1. , Stats., Register March 2015 No. 711 .