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Old 10-06-2016, 09:50 AM   #1
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Default Is PVC underground considered a wet location?

Is PVC underground considered a wet location and where can I find the definition of a wet location in the code book?
I am asking because I have always thought RWU had to be installed underground but some guy at work says TWN can be installed underground because the W stands for wet location and underground is considered a wet location.
Table 19 is pretty clear in that direct earth burial has to be TWU, RWU, NMWU, Teck90
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Old 10-06-2016, 10:00 AM   #2
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Yes! Water gets into underground pvc.
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Old 10-06-2016, 10:07 AM   #3
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So TWN can be installed underground?
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Old 10-06-2016, 10:46 AM   #4
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Originally Posted by Canaduh View Post
Is PVC underground considered a wet location and where can I find the definition of a wet location in the code book?
I am asking because I have always thought RWU had to be installed underground but some guy at work says TWN can be installed underground because the W stands for wet location and underground is considered a wet location.
Table 19 is pretty clear in that direct earth burial has to be TWU, RWU, NMWU, Teck90
It is because the PVC conduit in the ground is wet location because of condation inside the conduit and you will never able to keep the water out of the conduit it will find a way to get in.

Your Table 19 is clear on that but I do not have CEC book with me but I know the other type of conductors it listed is THWN is listed for wet location in conduit. which it will mention very clear in NEC code .

It is simauir wording in my Philippines codes too.
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Old 10-06-2016, 11:36 AM   #5
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Quote:
Originally Posted by Canaduh View Post
Is PVC underground considered a wet location and where can I find the definition of a wet location in the code book?
I am asking because I have always thought RWU had to be installed underground but some guy at work says TWN can be installed underground because the W stands for wet location and underground is considered a wet location.
Table 19 is pretty clear in that direct earth burial has to be TWU, RWU, NMWU, Teck90
Underground is a wet location.
You are correct in the W stands for wet in conduit and U designates direct burial.
Check the jacket and you will see that U cables are much thicker to prevent damage.
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Old 10-06-2016, 10:49 PM   #6
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Quote:
Originally Posted by Canaduh View Post
Is PVC underground considered a wet location and where can I find the definition of a wet location in the code book?
I am asking because I have always thought RWU had to be installed underground but some guy at work says TWN can be installed underground because the W stands for wet location and underground is considered a wet location.
Table 19 is pretty clear in that direct earth burial has to be TWU, RWU, NMWU, Teck90
You seem to be interchanging U/G PVC and U/G ... 2 different animals
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Old 10-07-2016, 02:16 PM   #7
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Originally Posted by Canaduh View Post
So TWN can be installed underground?
In conduit.
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Old 10-07-2016, 03:21 PM   #8
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Quote:
Originally Posted by Canaduh View Post
Is PVC underground considered a wet location and where can I find the definition of a wet location in the code book?
See 12-930(1) and 22-002(a).

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Old 10-07-2016, 03:40 PM   #9
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Originally Posted by mitch65 View Post
In conduit.
So RWU can be installed underground without conduit? Isn't RWU single conductor wire?
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Old 10-07-2016, 04:03 PM   #10
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Quote:
Originally Posted by Canaduh View Post
So RWU can be installed underground without conduit? Isn't RWU single conductor wire?
Yes and yes. Single conductors, not just cables, can be installed
underground. It's normal for homes fed underground to have the
3 separate single conductors running in the trench until they
reach directly under the meter base where they enter the PVC
conduit that protects from there up to the meter. Said conduit is
about 80" long if I recall correctly. Screened fill is required in the
trench.
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Old 10-08-2016, 03:58 PM   #11
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12-930(1)?
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