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Joined: May 2002
Posts: 1,716
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Makokiller, can you give an NEC reference to where it is required to have a #4 to the rod or rods?
Might you be thinking about a local code?
Roger
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Joined: Dec 2004
Posts: 51
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look at the chart 250.66 he said that he has a 200amp service.. do the math
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Joined: Jan 2003
Posts: 4,391
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Mako take a look at 250.66(A) and do the reading. ![[Linked Image]](https://www.electrical-contractor.net/ubb/wink.gif)
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Mako, as with any part of the NEC you must read the whole article, you can not stop at one section or table. 250.66 Size of Alternating-Current Grounding Electrode Conductor
The size of the grounding electrode conductor of a grounded or ungrounded ac system shall not be less than given in Table 250.66, except as permitted in 250.66(A) through (C). Here is the kicker. 250.66(A) Connections to Rod, Pipe, or Plate Electrodes Where the grounding electrode conductor is connected to rod, pipe, or plate electrodes as permitted in 250.52(A)(5) or (A)(6), that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than 6 AWG copper wire or 4 AWG aluminum wire. Roger
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Joined: Dec 2004
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so let me get this straight.. you could use #6 copper for your city water pipe connection, and your ground rods??? even for lets say a 300amp service??
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Joined: Jan 2003
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so let me get this straight.. you could use #6 copper for your city water pipe connection, and your ground rods??? even for lets say a 300amp service?? To the rod yes, to the water line it would be sized directly from table 250.66. Put a 4000 amp service in a field and you will only need a 6 AWG CU to one or two ground rods.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Dec 2004
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now that is what i thought.. when do 300 amp services, I run #4 to the rod and #2 to the water meter, and thanks, with the price of copper nowadays it will save me some money..
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Joined: May 2002
Posts: 1,716
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Mako, as Iwire points out, which is the point of this thread, the connection to the rod(s) only need be a #6 copper regardless of the size of the service.
In this thread the water piping is not part of the GES.
Roger
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Joined: May 2002
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Mako, sorry, you posted while I was typing.
Roger
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Joined: Apr 2003
Posts: 13
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I think you need to bond the water line ( Key Word ) and ground 2 rods
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