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Grounding #79460
12/27/01 09:44 PM
12/27/01 09:44 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
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.

2017 / 2014 NEC & Related Books and Study Guides
Re: Grounding #79461
12/27/01 11:12 PM
12/27/01 11:12 PM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
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
12/27/01 11:56 PM
12/27/01 11:56 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
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
12/27/01 11:58 PM
12/27/01 11:58 PM
F
frodo  Offline OP
Member
Joined: May 2001
Posts: 129
louisville, ky usa
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 08:06 AM
12/28/01 08:06 AM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,276
Fullerton, CA USA
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 04:00 PM
12/28/01 04:00 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
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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