Fordean
Senior Member
- Location
- New Jersey
- Occupation
- Electrical Contractor
someones attention need to be directed to section 250.52(A) (1) (2008 NEC), last sentyence that states "'interior metal water piping located more than 5 feet from the point of entrance to the building shall not be used as a part of the grounding electrode systemor as a conductor to interconnect electrodes that are part o the grounding electrode system
250.64 (D) (1) Common Grounding Electrode Conductor and Taps.
A common grounding electrode conductor and grounding
electrode conductor taps shall be installed. The common
grounding electrode conductor shall be sized in accordance
with 250.66, based on the sum of the circular mil area of
the largest ungrounded service-entrance conductor(s).
(2) Individual Grounding Electrode Conductors. A
grounding electrode conductor shall be connected between
the grounded conductor in each service equipment disconnecting
means enclosure and the grounding electrode system.
Each grounding electrode conductor shall be sized in
accordance with 250.66 based on the service-entrance conductor(
s) supplying the individual service disconnecting
means.
i respectfully disagree.the code section specifically states that water piping more than 5 feet from the point of entrance into the building (NEC definition for point of entrance, not water entrance) shall not be used as part of the GEC system.
i respectfully disagree.the code section specifically states that water piping more than 5 feet from the point of entrance into the building (NEC definition for point of entrance, not water entrance) shall not be used as part of the GEC system.
Re-think your thoughts
(C) Metallic Water Pipe and Structural Metal. Grounding electrode conductors and bonding jumpers shall be permitted to be connected at the following locations and used to extend the connection to an electrode(s):
- Interior metal water piping located not more than 1.52 m (5 ft) from the point of entrance to the building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system. Exception: In industrial, commercial, and institutional buildings or structures, if conditions of maintenance and supervision ensure that only qualified persons service the installation, interior metal water piping located more than 1.52 m (5 ft) from the point of entrance to the building shall be permitted as a bonding conductor to interconnect electrodes that are part of the grounding electrode system, or as a grounding electrode conductor, if the entire length, other than short sections passing perpendicularly through walls, floors, or ceilings, of the interior metal water pipe that is being used for the conductor is exposed.
i respectfully disagree.the code section specifically states that water piping more than 5 feet from the point of entrance into the building (NEC definition for point of entrance, not water entrance) shall not be used as part of the GEC system.
Pedro, you said the same thing Bob said, just with different words, I don't know what you are disagreeing with.
all that means is you have to run your GEC to within 5 feet of where the water pipe enters the bldg and can't use the interior piping as part of the GEC. Otherwise you could hook it up anywhere on the interior piping. I don't think the OP is planning to do that.
I am not sure there is any requirement that you have to count all three services in figuring the size of the GEC.