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Old 02-27-2013, 10:41 PM   #1
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GEC & grounding for two townhouses


This is a two-owners/two-townhouses situation.

There is one large outside panel with TWO meters and TWO main disconnect breakers for TWO townhouses. One of the townhouses (one common wall between them) is mine. The owner of the other townhouse rents out his unit. He will cooperate but does not want to invest more $$ in his unit.

From this large (double) disconnect panel, there are TWO RMCs (one for each townhouse), each carrying #2 AL feeders and one ground (#10 CU) to TWO distribution panels. One green wire (#6 CU) goes from the panel ground bar in each townhouse to a cold water inlet somewhere in the unit.

Is this correct?

In a single residence situation, the cold water inlet would be connected to the utility service neutral in the outside panel. What does the NEC require when there are multiple units with a single super-panel outside that holds all the meters and disconnect breakers?

Thank you,
Lynnx

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Old 02-28-2013, 06:48 AM   #2
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GEC & grounding for two townhouses


One qualifying water pipe grounding electrode (metal exiting the building undegound and as far as anyone knows, going at least 20 feet) must be bonded as part of the building grounding electrode system. Continue a #6 (service #1/O copper or smaller) copper grounding electrode conductor from the pipe (within 5' of its exit) to a point on the GES that continues on to the main disconnect with at least the same size GEC.

Parts of the building plumbing with plastic pipe separating them from the pipe with the GEC or with no (pipe) connection to said pipe should be bonded to somewhere on the portion of the plumbing that is all metal coming from the pipe with the GEC clamp. This wire (called a bonding jumper) might simply run from one end of the plastic pipe to the other. Use the same wire gauge that was used for the water pipe GEC.

The ground wire (equipment grounding conductor) from the building panel (actually a subpanel in this situation) to the main disconnect, or the conduit it is contained in, does not count as a GEC or a bonding jumper. A separately run GEC/BJ does not have to follow the route of the panel feed.

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Last edited by AllanJ; 02-28-2013 at 07:09 AM.
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Old 02-28-2013, 05:51 PM   #3
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GEC & grounding for two townhouses


So this meter IS attached to the structure?

If so, then you would have your cold water pipe bonded to the MAIN disconnect ( IF your water pipe actually qualifies for a GEC) which would be at the meter location, and two supplement ground rods as well....
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Old 02-28-2013, 07:31 PM   #4
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GEC & grounding for two townhouses


What is a TWO meter?
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Old 02-28-2013, 07:38 PM   #5
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GEC & grounding for two townhouses


Quote:
Originally Posted by bobelectric View Post
What is a TWO meter?
I'm assuming a two meter pack...
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Old 02-28-2013, 09:11 PM   #6
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GEC & grounding for two townhouses


Quote:
Originally Posted by bobelectric View Post
What is a TWO meter?
about 6.5 feet...

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