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Illustrated Changes to the NEC, 2002 Edition - Part 1

Article 250


250.104 Bonding of Piping Systems and Exposed Structural Steel

The word “interior” was deleted in this section. This section now reads:

(B) Other Metal Piping Systems. Interior Metal piping, including gas piping that may become energized must be bonded to:
  • The service equipment enclosure,
  • The grounded (neutral) conductor at the service,
  • The grounding electrode conductor where of sufficient size, or
  • Any grounding electrodes used to form the grounding electrode system.
The metal piping bonding jumper must be sized in accordance with Table 250.122 using the rating of the circuit that may energize the piping. The equipment grounding conductor for the circuit that may energize the piping can serve as the bonding means. Figure 250–18

Intent: The revised text makes it clear that an equipment grounding conductor can bond all metal piping, including gas piping. So, in effect, an additional bonding jumper is not required for gas or other metal piping.

Author’s Comment: This rule applies to metal piping systems for liquids and vapors such as gas, compressed air, etc. For metal water piping systems, see 250.104(A).

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