One or Two Ground Rods?

[DB_Cooper]

I am installing 2 new 100 amp meter/mains on a house. One box is replacing the existing FPE service from the 1940's, while the other is strictly for agricultural use. The existing panel has residential AND agricultural loads feeding from it. So I am separating the load currently feeding the agricultural use from the FPE house meter. There will still only be one service from the utility company to the building, but two separate meters.

Do I need 2 separate ground rods or can I use one ground rod with two GEC's? The panels are being set side by side.

 

[Dennis Alwon]

The code requires 2 ground rods for one service unless you can get 25 ohms with one rod. If you can then only one rod with 2 grounding electrode conductors is required.

 

[augie47]

250.64 requires each service disconnect be connected to the grounding electrode system (with other options available), however, they can all connect to the same grounding electrodes.
(Check 250.64 for details)
One rod or two depends on 250.56

 

[cadpoint]

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