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Old 12-27-2008, 06:33 PM   #1
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I have a 100 Amp sub-panel in my detached shop. (30'X40') My house has 200Amp.

My question is do I need to install the green box bonding screw on the neutral buss bar that came with the 100 Amp panel? I was told don't use it with no explanation.

It's bonded on my 200 Amp in the house. Thank you; Restomod69

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Old 12-27-2008, 07:01 PM   #2
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How many wire are run from the main panel to the sub panel?
Try searching for sub panel on this site. There are a lot of threads about panel setup.

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Old 12-27-2008, 07:29 PM   #3
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I have three (3) #2ga. THHN from the house to the shop underground in 1 1/4" rigid pipe.
Thanks! I'll start searching around sub-panels
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Old 12-27-2008, 07:38 PM   #4
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In a correctly wired subpanel the neutral and ground buss bars are to be separated. This is to prevent objectional current flow on the grounding conductor back to the main panel. Neutral current will flow back to the main panel (the source) on the neutral conductor and the grounding conductor if its wired incorrectly. Its definitely a code violation. The main panel is where the neutral and ground buss are to be connected.
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Old 12-27-2008, 07:55 PM   #5
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Quote:
Originally Posted by Steelhead View Post
In a correctly wired subpanel the neutral and ground buss bars are to be separated. This is to prevent objectional current flow on the grounding conductor back to the main panel. Neutral current will flow back to the main panel (the source) on the neutral conductor and the grounding conductor if its wired incorrectly. Its definitely a code violation. The main panel is where the neutral and ground buss are to be connected.
Depending on which code cycle the AHJ is using it may not be a code violation.
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Old 12-27-2008, 07:58 PM   #6
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Since you have only three wires running to the panel, then yes, you must install the bond screw. You also need to have a couple of ground rods.
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Old 12-27-2008, 08:00 PM   #7
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Could they be using the rigid pipe as the ground?
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Old 12-27-2008, 08:00 PM   #8
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Steelhead & Jerry: I have a matellic pathway from my house to my shop. 1 1/4" pipe underground.
I am not bonded to the netural buss because I was told DO NOT use the green (supplied) screw that bonds the box to the netural buss in sub-panel. I should be OK now, right?
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Old 12-27-2008, 08:18 PM   #9
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Quote:
Originally Posted by jerryh3 View Post
Could they be using the rigid pipe as the ground?
D'OH! I automatically assumed that it was rigid nonmetallic, ie. PVC. Sorry folks.
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Old 12-27-2008, 08:20 PM   #10
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Quote:
Originally Posted by restomod69 View Post
Steelhead & Jerry: I have a matellic pathway from my house to my shop. 1 1/4" pipe underground.
I am not bonded to the netural buss because I was told DO NOT use the green (supplied) screw that bonds the box to the netural buss in sub-panel. I should be OK now, right?

This is a code compliant setup, if all the locknuts are good and tight. Often though panels are painted with a tough enamel, and the connection provided by a locknut isn't, in my opinion, adequate. I would use a bond bushing at each end to be on the safe side.
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Old 12-27-2008, 08:34 PM   #11
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I have 1 1/4" locknuts on both sides of the pipe, put on with a pipe wrench and cut into both sides of the enclosure and topped of with a plastic bushing. The house side has the 1 1/4" locknuts and a box bonding bushing with #8ga. THHN to the neutral buss bar. TKS.
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Old 12-28-2008, 12:44 PM   #12
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Quote:
Originally Posted by InPhase277 View Post
This is a code compliant setup, if all the locknuts are good and tight. Often though panels are painted with a tough enamel, and the connection provided by a locknut isn't, in my opinion, adequate. I would use a bond bushing at each end to be on the safe side.
I agree. Install two bonding bushings, install the bonding screw and be done with it. Plenty time left for a couple cold ones.
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