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Tool Talk Discussion Forum

Re: 3 phase grounding

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Author  [Modern View]

01-07-2014 16:03:32

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At the bottom right corner of the neutral lug there is a long green screw that is inserted into the box. I figured that connected them.


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Little Ed

01-07-2014 19:02:17

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 Re: 3 phase grounding in reply to WyoDave, 01-07-2014 16:03:32  
that would be true only if the green screw were going thru the block and pushing against a bare spot on the box. Surely that is not the case. There would have to be a physical connection, such as a wire run from the grounding lug to the green screw to achieve bonding. And the way I have always understood the posts of this nature, this should be done at the first box on your side of the meter, as in this case

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01-07-2014 20:53:20

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 Re: 3 phase grounding in reply to Little Ed, 01-07-2014 19:02:17  
That is the case. The screw goes through the plastic and is threaded into the case. Yes, this is the first disconnect, so them being connected here would be correct as I understand it.


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01-07-2014 19:17:32

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 Re: 3 phase grounding in reply to Little Ed, 01-07-2014 19:02:17  
Yep like on Mobile homes, you must have a disconnect on the pole and then you run 4 wires to the MH main breaker box.

On most regular homes the breaker box is the disconnect after the meter so the neutral and ground bond there.

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Dusty MI

01-07-2014 16:16:27

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 Re: 3 phase grounding in reply to WyoDave, 01-07-2014 16:03:32  
Quoting Removed, click Modern View to see

I missed that. You don't need to connect that jumper. That green screw is doing that.


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