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Grounding #79460 12/27/01 10:44 PM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
Hi,
Is there not an exception in the 1999 NEC that allows #6 copper to be used for the cold water ground on a 200A service?

This is the grounding electrode conductor is it not?

thanks for any replies.

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Re: Grounding #79461 12/28/01 12:12 AM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
Member
The exceptions only apply to made electrodes like ground rods. The metal water pipe always requires a grounding electrode conductor or bonding jumper sized per Table 250-66. See 250-66.
Don(resqcapt19)


Don(resqcapt19)
Re: Grounding #79462 12/28/01 12:56 AM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
hi,
in the 2002 NEC section 250.66 (A) it appears to allow a #6 to a pipe.

i am missing how to identify the size difference from the ground rod to the water pipe...i always thought these were the same size.

is there a difference between the 99 code and 2002 code regarding this?

thanks

Re: Grounding #79463 12/28/01 12:58 AM
Joined: May 2001
Posts: 129
F
frodo Offline OP
Member
hi,
in the 2002 NEC section 250.66 (A) it appears to allow a #6 to a pipe.

i am forgot how to identify/determine the size difference between the ground rod and to the water pipe...i always thought these were the same size.

is there a difference between the 99 code and 2002 code regarding this?

thanks

Re: Grounding #79464 12/28/01 09:06 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
Frodo,
The exception is for a driven pipe electrodemade the same as the way you'd drive a ground rod. It's not for a water pipe.
The driven pipe electrode is normally a pretty crummy ground, but if your soil conditions permit, & you can get it below 25 ohms, what the heck.

Re: Grounding #79465 12/28/01 05:00 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
Scott is right. 250.66 wil not allow the #6 copout on a H20 pipe, because it's seen as the lowest ohmic value, municipal systems being miles long.
Ground rods are all for show, try & get below 25 ohms, and your rod separation may well be 50' or more, Ufer's will someday rule, if we can be tipped off before the concrete dudes* pour
*knarly bunch that they be...
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