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Old 05-10-2008, 03:06 PM   #1
ifinew
 
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detached garage


I could use some pro help, i have been lurking around here searching a bit
it have an existing 1.5" ent buried between house and garage with no known metalic connection.

i would like to know what size power conductors can be used through it and be within the fill/%.
after looking in the lb's i need to change out nmb6 with something else.

also need info on distance of a ground rod from the breaker box inside.

it needs an upgrade on the electric for a welder and some correcting.

i have purchased a square d homline mainlug 125 box 8 space but my most recent search ( garage box cannot be between studs? has to be outside of sheetrock?)

Last edited by brmax; 05-11-2008 at 10:54 AM.
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Old 05-10-2008, 03:56 PM   #2
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detached garage


If it's emt (thinwall)....it's probably all rotted out......thinwall is not rated for burial.
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Old 05-10-2008, 07:22 PM   #3
ifinew
 
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detached garage


Its the pvc type gray in color 1.5", the run length is 56' from box to box 1 way
im wanting to know if #2 or #4 can be used for the two hots and if the neutral has to be the same size. i understand the green to ground rod can be smaller.
are these wires to big for this existing conduit?
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Old 05-10-2008, 07:29 PM   #4
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detached garage


Joba, I believe the post says ENT Electrical Nonmetalic Tubing. Is this correct brmax? If this is the case you can pull 3 #3awg THHW and 1 #6 THHW, this will get you a 100 amp feeder to your sub panel. Hook the wires on a 100 amp breaker in your main panel, use the #6 for the ground, because this is a sub panel you must run a 4 wire feeder to the sub. In the sub do not bond the neutral to the ground, and do not mix the neutral and ground conductors for the branch circuits.
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Last edited by wire_twister; 05-10-2008 at 07:30 PM. Reason: spelling
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Old 05-10-2008, 07:30 PM   #5
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If it is indeed ENT (electrical nonmetallic tubing), the codebook says in table C.1(A) that four 2/0 thhn/thwn will fit. In reality though, if it's longer than about 10' and has more than 1 90 in it, it'd be a royal bear to pull.

If it's schedule 40 PVC, according to table C.10(A), four 1/0,s are allowed. Again, a hard pull.

Realistically, depending on length and number of 90's, three #2's and a ground wouldn't be too difficult to pull in. That's good for 100 amps.

Rob
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Old 05-10-2008, 07:36 PM   #6
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It is # 2 and not #3 good catch Rob thanks. brain death is a terrible thing!
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Old 05-11-2008, 09:22 AM   #7
ifinew
 
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detached garage


thanks for the replys, so i understand this heres whats on the pipe

1 1/2 sch 40 rigid pvc conduit max 90 deg c wire nema tc2 sunlight resistant 98 may 26 2 3 ba s e126014 underwriters labratories inc listed nonmetalic conduit above ground and below ground # u649

getting the old out doesnt look that easy thought about picking up some grease lookin stuff i seen at graybar and putting down the lb access.

anyway the hook up to main panel or meter is what im after at this time

do i have to run a 4 wire ? its detached, i thought instaling a ground rod was the deal, new nema 08 ok
i still cannot understand not being able to flush mount the breaker box can anyone explain this

Last edited by brmax; 05-11-2008 at 02:01 PM.
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