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Tractor Talk Discussion Forum

Electrical

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Dave Sherburne

04-02-2013 17:03:33




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What size conduit do I need for 4 number ten wires?
Does EMT conduit need a ground/earth wire or can the conduit be the ground. I've already put the ground/green wire in but I wonder if it was needed.




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John T

04-03-2013 05:34:12




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
Given proper NEC and UL approved bonding methods the EMT could be used as the GroundING Conductor, HOWEVER when I was a design engineer I always instead relied on the standard GroundING wire,,,,, ,,,

John T



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dr sportster

04-02-2013 18:11:16




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
I did the calculation in the chart the Janicholson posted and 1/2 conduit would not be acceptable for 4 #10 AWG . I remember when the code said you could put three number 8 AWG conductors into 1/2 inch EMT which could not begin to physically fit No way no How.Sometimes the fill in the code is suprising and it is always easier to oversize the pipe by one size past required. I once ran 1/2" rigid between lightpoles and had a very hard time getting the snake to come up the far side.

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dr sportster

04-02-2013 17:45:23




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
Disregard my answer I thought you were buring PVC for some reason.[Like not knowing how to read] Sorry nevemind.



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Ken-Pa

04-02-2013 17:39:44




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
I've used 3/4" conduit but the wires were snug . If I had to do over , I'd use 1" conduit instead . It's always good to have air space just incase you need to pull a certain wire & replace it due to an internal break inside the insulation(believe me , it does happen) . And to your question about using the conduit as an equipment grd , no . It's always best insurance to run a designated wire for grounding purposes . Always install a green grd screw in all of the circuit boxes & be sure you either use a green conductor as the grd wire or use green coded tape on the grd wire before inserting it thru the conduit & a white wire for the neutral or use white tape on that conductor before installing it thru the conduit also . As a common practice back when I was doing electrical contracting , I color coded my wires every couple feet as an insurance for future identification by someone else in the future . I HTH ! God bless

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dr sportster

04-02-2013 17:38:26




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
By code any size but I would use 3/4 minimun because 1/2 can be tough to get the snake to go up the 90 degree bends. If you are going outside the house the ground is required ,either way you did not waste your money running a grounding conductor. Driving a rod at an outer building with no ground is a code violation as earth is not to be used as a grounding path. Sounds like you are done already anyhow.

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Janicholson

04-02-2013 17:28:19




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 Re: Electrical in reply to Dave Sherburne NY, 04-02-2013 17:03:33  
This will give you the specification. Jim



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