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  #1  
Old 7/8/18, 8:27 PM
Marcel Gratton, CMI's Avatar
Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Sub-panel with ground rod

Service equipment grounded to city water pipe and 4 wires (2X120V, neutral and ground) from the distribution panel going to the detached garage sub-panel. Garage has a ground rod in addition to the ground from the service equipment; is that proper?



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Old 7/8/18, 9:07 PM
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Default Re: Sub-panel with ground rod

Yes, the sub-panel needs to be connected to a grounding electrode system (GES) since it's a detached structure. A GES can be ground rods, or a CEE or other electrodes. Unless a single rod is 25 ohms or less you would need two rods. Also it would get connected to the EGC bus not the neutral conductor.
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Old 7/8/18, 9:52 PM
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Marcel Gratton, CMI Marcel Gratton, CMI is offline
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Default Re: Sub-panel with ground rod

Thanks Robert for your quick response!
I could not confirm where it was connected because I did not remove the cover. It had pointy screws holding it and the disconnect beside (with the pennies) didn't encourage me either...
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Sub-panel with ground rod-img_0055-jpg   Sub-panel with ground rod-img_0056-jpg  



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Old 7/9/18, 3:43 PM
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Default Re: Sub-panel with ground rod

Pennies, yuck. Improper grounding might be the least of the problems.
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