Drick
In the Trades
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I am installing a subpanel next to my main panel as I am running out of breaker space. The house is only 3 years old, but the electrician only put in a 32 space panel.
Anyway, I connected my subpanel to the main panel with a short length of 2 inch diameter EMT with compression fittings rated for use with EMT at each end. Do I still need to run a grounding conductor to the subpanel? Article 358.2 and 358.60 makes me think no. However I ran #4 bare anyway to the grounding bar in the subpanel just to be sure I had a good ground. I'm a bit leery of the panel board enclosures providing a constantly reliable ground unless you are actually threaded into them as the grounding bars are. I suppose as long as the compression fittings are tight it doesn't matter.
Thoughts? Did I waste a couple of bucks on the #4?
-rick
Anyway, I connected my subpanel to the main panel with a short length of 2 inch diameter EMT with compression fittings rated for use with EMT at each end. Do I still need to run a grounding conductor to the subpanel? Article 358.2 and 358.60 makes me think no. However I ran #4 bare anyway to the grounding bar in the subpanel just to be sure I had a good ground. I'm a bit leery of the panel board enclosures providing a constantly reliable ground unless you are actually threaded into them as the grounding bars are. I suppose as long as the compression fittings are tight it doesn't matter.
Thoughts? Did I waste a couple of bucks on the #4?
-rick
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