13: 10.6.8*In no case shall the underground piping be used as a
grounding electrode for elec-
trical systems.
A.10.6.8.1While the use of the underground fire protection piping as
the grounding elec-
trode for the building is prohibited, NFPA 70requires that all
metallic piping systems be
bonded and grounded to disperse stray electrical currents. Therefore,
the fire protection piping
will be bonded to other metallic systems and grounded,but the
electrical system will need
an additional ground for its operation.
Bonding is being connected to the ground system. The sprinkler system
(specified for the underground portion) can not be used as a ground
system. The last time I looked (more than a few days now) NEC said
that all metal piping capable of becoming energized shall be
grounded. That typically is interpreted as ALL. Must confess I
haven't dug through the nasty details since it hasn't been a common
problem.
Roland
On Oct 11, 2011, at 3:04 PM, Ron Greenman wrote:
NEC requires all metal to be bonded, not grounded (semantics sort of
since
both go to earth, but there is a difference between bonding and
grounding).
I'd look it up but have to go to a meeting.
On Tue, Oct 11, 2011 at 2:59 PM, Travis Mack, SET
<[email protected]>wrote:
There is a local jurisdiction here that requires it. He tells me
it is in
the NEC.
On 10/11/2011 2:58 PM, Steve Leyton wrote:
Assuming it's in there somewhere, where does 13 and or 24 speak to
attaching bonding or grounding wires to sprinkler systems?
Question
posed to me today and I had to admit that I don't know ... hate
it when
that happens.
Steve Leyton
PROTECTION DESIGN& CONSULTING
2851 Camino del Rio South, Suite 400
San Diego, CA 92108
------------------------------**------------------------------**-
Ph: 858.751.2930 - ext. 102
Fax: 858.751.2933
Cell: 619.972.5696
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--
Ron Greenman
Instructor
Fire Protection Engineering Technology
Bates Technical College
1101 So. Yakima Ave.
Tacoma, WA 98405
[email protected]
http://www.bates.ctc.edu/fireprotection/
253.680.7346
253.576.9700 (cell)
Member:
ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC
They are happy men whose natures sort with their vocations. -Francis
Bacon,
essayist, philosopher, and statesman (1561-1626)
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