EB Schedule 20 pvc pipe

[RUWired]

Are the uses permitted/not permitted the same as schedule 40/80? Most importantly, can sch.20 be used in duct banks w/o concrete, using screenings and compaction above.
Rick

 

[celtic]

Re: EB Schedule 20 pvc pipe

I never even heard of schedule 20 - a quick search on the NECH also showed nothing.

What exactly is Schedule 20?

 

[don_resqcapt19]

Re: EB Schedule 20 pvc pipe

Schedule 20 is not permitted for any NEC application. It is commonly used by telephone utilities for underground duct banks.
Don

 

[RUWired]

Re: EB Schedule 20 pvc pipe

The contractor that i work for has been using it in ductbanks with concrete off and on over the years,and heard recently he wanted to use it direct buried.I wanted to make sure that application was ok.I remember it as schedule 20 type EB ,not sure what EB stands for.
Rick

 

[RUWired]

Re: EB Schedule 20 pvc pipe

Is it not permited because it is not listed in the book?

 

[tom baker]

Re: EB Schedule 20 pvc pipe

The NEC requires any chapter 3 wiring method, including rigid nonmetallic conduit, to be listed.
Sch 20 is not listed, and can't be used for an NEC application.

 

[RUWired]

Re: EB Schedule 20 pvc pipe

Thats interesting,I wonder how he was able to get around that?( maybe he cheated).And now its going to be used next to runways(runway lighting) with compacted soil above it.I can't see it holding up.
Rick

 

[celtic]

Re: EB Schedule 20 pvc pipe

Originally posted by RUWired:
...its going to be used next to runways(runway lighting) with compacted soil above it.I can't see it holding up.
Rick

I can't believe the job specs don't call for RMC!

 

[bdarnell]

Re: EB Schedule 20 pvc pipe

Originally posted by RUWired:
not sure what EB stands for.

Encased Burial. There is also a type DB - Direct Burial. As other's have said, it's used primarily (no pun) by utilities for telephone cables, primary feeders, etc. Since they are typically outside the purview of the NEC, no worries for them.

 

[RUWired]

Re: EB Schedule 20 pvc pipe

Specs called for schedule 40 with select fill.Dyslexic PM,I don't know the whole story,but i think Airport authority has him back filling with screenings as an option.Not sure if local AHJ is involved with project or not.I'll ask around for more info.
Rick

 

[RUWired]

Re: EB Schedule 20 pvc pipe

bdarnell,ENCASED burial,go figure,Maybe a little call will honor the nec.
Rick

 

[RUWired]

Re: EB Schedule 20 pvc pipe

Turns out that there using DB20 (direct buried ) pipe.The local AHJ has not been involved in this project.Only the AA is involved and they allowed the screenings as protection.I don't know if they are aware of the nec not listing it as an approved raceway.
Rick

 

[celtic]

Re: EB Schedule 20 pvc pipe

Sometimes, airports do not follow the NEC.
It may have something to with the land on "air side" being international - as you are not technically in the USA until you pass through customs.

 

[charlie]

Re: EB Schedule 20 pvc pipe

I see no problem with using it wherever you can direct bury a cable and you are willing to consider this a direct buried cable. We use grade DB all the time and require 30 in. of cover to keep it from crushing. We consider it a hole in the earth that may crush in the future but it has a fighting chance of holding up.

 

[hardworkingstiff]

Re: EB Schedule 20 pvc pipe

Originally posted by charlie:
We consider it a hole in the earth that may crush in the future but it has a fighting chance of holding up.

I've talked with a local POCO engineer that indicated they had some problems with it not holding up. I believe they have gone away from it.

 

[charlie]

Re: EB Schedule 20 pvc pipe

We put in miles of it every year.