Bonding of Piping Systems and Exposed Structural Metal
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The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
Top 50 NEC Rules
Bonding of Piping Systems and Exposed Structural Metal
By Mike Holt
To remove dangerous voltage on metal parts from a
fault, electrically conductive metal water piping systems, metal
sprinkler piping, metal gas piping, and other metal piping systems, as
well as exposed structural steel members that are likely to become
energized, must be bonded to an effective ground-fault current path
Although bonding isn't required for isolated sections of metal water
piping connected to a nonmetallic water piping system, metal water
piping systems must be bonded in accordance with the following:
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read the rest of this article.
- Building Supplied by a Service. The metal water piping
of a building or structure must be bonded to one of the following:
service equipment enclosure; grounded neutral service conductor;
grounding electrode conductor where the grounding electrode conductor
sized in accordance with Table 250.66; or one of the electrodes of the
grounding electrode system. The metal water pipe bonding jumper must be
sized in accordance with Table 250.66, based on the largest ungrounded
service conductor. Where hot and cold water pipes are electrically
connected, only one bonding jumper is required, either to the cold or
hot water pipe. Otherwise, a single bonding jumper, sized in accordance
with 250.104(A)(1), must be used to bond the hot and cold water piping
- Multiple Occupancy Building. When the metal water piping
system in an individual occupancy is metallically isolated from other
occupancies, the metal water piping system for that occupancy can be
bonded to the equipment grounding terminal of the occupancy's
panelboard. The bonding jumper used for this purpose must be sized to
the ampere rating of the occupancy's feeder overcurrent protection
device in accordance with Table 250.122.
- Building or Structure Supplied by a Feeder. The metal water
piping system of a building or structure that is supplied by a feeder
must be bonded to: the equipment grounding terminal of the building
disconnect enclosure; the feeder equipment grounding (bonding)
conductor; or one of the electrodes of the grounding electrode system.
The bonding jumper for the metal water piping system must be sized to
the feeder circuit conductors that supply the building or structure in
accordance with Table 250.66. The bonding jumper is not required to be
larger than the ungrounded feeder conductors. Note: It makes no
sense to size the metal water piping bonding jumper in accordance with
Table 250.66, based on the feeder circuit conductor size. The bonding
jumper should be sized in accordance with Table 250.122, based on the
building or structure feeder overcurrent protection device.
Editor's note: This information was extracted from Mike
the National Electrical Code
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What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
NEC? Visit EC&M's Web
site to see the answer.
Hint: What is physical damage?
By Mike Holt
Q. Can I secure signal or communications cables
to ceiling-support wires or ceiling grid?
Web site to see the answer.
By Steven Owen
Q. In general, a disconnecting means is required
for each sign and outline lighting system or feeder circuit and branch
circuit supplying a sign or outline lighting system per 600.6. When is
a disconnecting means not required per 600.6?
- When the sign is an exit directional sign supplied by batteries.
- When the sign is cord-connected with an attachment plug.
- When the sign is an exit directional sign located within a
- Both B and C.
Web site for the answer and explanation.
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Code News Update
According to the April 2007 issue of NFPA News,
the NFPA Standards Council recently approved the development of one or
two new documents related to flame-resistant garments. The Flash Fire
Protective Garments Committee will address: 1) the design,
manufacturing, testing, and certification of new single-use or
limited-use flame-resistant garments; and 2) the selection, care,
maintenance, and use of single-use or limited-use flame-resistant
garments. If this topic piques your interest, and you'd like to join in
on the development process, then download a Technical
Committee form from the NFPA Web site or request one from the Codes
and Standards Administration, NFPA, One Batterymarch Park, Quincy,
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Listed Cabinet Coolers from EXAIR produce 20 degree Fahrenheit air from
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Thermostat control minimizes air usage. Maintains the NEMA 4, 4X
(stainless steel) and 12 rating of the enclosure. Web site offers
detailed information, downloadable drawings and PDF literature.
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