Services & DistributionQuestion 89 of 521
Metal water piping system(s) in or attached to a building must be:
a.Left unconnected to avoid stray current
b.Used as the sole grounding electrode
c.Bonded to the service equipment enclosure, grounded conductor, or grounding electrode conductor
d.Connected only to the gas piping
Explanation
Per 250.104(A), the interior metal water piping system must be bonded, with the bonding jumper sized per Table 250.102(C)(1) based on the service conductors. Metal water piping alone cannot be the sole electrode, and it must not be left unbonded or bonded only to gas piping.
Law Reference: 2023 NEC §250.104Practice all 521 questions free — no signup required.
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