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Old 12-09-2009, 11:09 AM   #1
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Underground Cable Question


I know that if a cable says UF (Underground Feed) means of course it can be fed underground without conduit. But the w ( wet ) as in thw wire, does it have to be in conduit underground?

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Old 12-09-2009, 11:14 AM   #2
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Underground Cable Question


Yes. Individual conductors must always be install inside a wireway.

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Old 12-09-2009, 11:22 AM   #3
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Underground Cable Question


I know that thwn 4/0 cable isn't always incased in conduit and they are individual conductors, aleast outside of city limits, where does the exemption in wire size start? I just asking , not trying to be a pain.
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Old 12-09-2009, 11:28 AM   #4
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Underground Cable Question


Outside of city limits ?
Installed by who ?
Inspected & installed by code ?
Or they just did whatever they wanted to ?

NEC does not control what the POCO does, so if it was installed by POCO....
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Old 12-09-2009, 11:40 AM   #5
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Underground Cable Question


What does POCO stand for? I live in a rural part of Missouri and it get either plowed in or trenched in.
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Old 12-09-2009, 12:07 PM   #6
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Underground Cable Question


I need to rephrase the question, XHHW (Service Entrance Cable) was the one I seen buried without conduit, why can that be without conduit and the THWN cannot?
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Old 12-09-2009, 12:09 PM   #7
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Underground Cable Question


Quote:
Originally Posted by Livewire78 View Post
I know that thwn 4/0 cable isn't always incased in conduit and they are individual conductors, aleast outside of city limits, where does the exemption in wire size start? I just asking , not trying to be a pain.

It really depends on the area, here in Orange County it has to be in a wireway, the inspectors are not worried about what size of the wire is, but how safe it is and how well its protected.
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Old 12-09-2009, 12:15 PM   #8
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Underground Cable Question


The designations like XHHN and THHW are insulation types, not a wiring method.

Underground wiring types would be like URD, UF-B, USE and others.

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