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Date: 07/24/00 at 4:02 PM
Posted by: Chaman
E-mail: consulting@microvolt.com

In Reply to: control power wiring posted by A Lowe on 07/04/00 at 8:41 AM:

Hope this helps:

GROUNDING ELECTRODE CONDUCTOR (GEC)
for
Alternate-Current Systems
Size of Largest Service-Entrance Conductor, CU Wire Size of Grounding Electrode Conductor (GEC), CU Wire*

2 or smaller 8
1 or 1/0 6
2/0 or 3/0 4
Over 3/0 thru 350 kcmil 2
Over 350 kcmil thru 600 kcmil 1/0
Over 600 kcmil thru 1100 kcmil 2/0
Over 1100 kcmil 3/0

Notes:
1. Ref: NEC, Table 250-94.
2. * Where connected to a concrete-encased electrode system, NEC 250-81(c)- UFER, the GEC need not be more than No. 4 copper wire.

Services/Feeders Table

Electrical Tables Library

http://www.cmapc.com/Elect%20Files/EHtmFiles/ServicesFeedersTable.htm

http://www.cmapc.com/_private/electsfr.htm

http://www.cmapc.com/Elect%20Files/EHtmFiles/GECTable250-94.htm

http://www.cmapc.com/Elect%20Files/EHtmFiles/livepanelboad.htm

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