sch 80 nonmetalic conduit
- Thread starter baldy
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BAHTAH
Senior Member
- Location
- United States
Re: sch 80 nonmetalic conduit
See 300.5
See 300.5
pierre
Senior Member
- Location
- Westchester County, New York
Re: sch 80 nonmetalic conduit
Are you talking about surface mounting on the wall for physical protection?
Pierre
Are you talking about surface mounting on the wall for physical protection?
Pierre
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: sch 80 nonmetalic conduit
Its been part of the UL listing for PVC Conduit-it states schedule 80 PVC is considered suitable for protection from physical damage were installed on poles. It was added to the 2002 NEC in 300.5 under service cables, but if you read through the section, it actually referes to all cables, and the UL listing applies to any application. Sch 80 is considered equal to RMC.
If you use PVC on a pole, it probably will have to be Sch 80.
See 300.5(4)
Its been part of the UL listing for PVC Conduit-it states schedule 80 PVC is considered suitable for protection from physical damage were installed on poles. It was added to the 2002 NEC in 300.5 under service cables, but if you read through the section, it actually referes to all cables, and the UL listing applies to any application. Sch 80 is considered equal to RMC.
If you use PVC on a pole, it probably will have to be Sch 80.
See 300.5(4)
charlie
Senior Member
- Location
- Indianapolis
Re: sch 80 nonmetalic conduit
Tom, I assume you really didn't mean that statement literally. I assure you that schedule 80 mounted on a pole will never hold up as well as RMC or even IMC if attacked with a heavy tool.
BAHTAH
Senior Member
- Location
- United States
Re: sch 80 nonmetalic conduit
I think Tom is pointing out that 300.5(4) Enclosure or Raceway Damage states that PVC SCH-80 is called out by the NEC for the protection of conductors from physical damage along with RMC and IMC and other conduits SCH-40 for example are not shown as being equal in that application. Having worked for Dept of Water & Power City of LA, in the underground for seveal years I recall we would use RMC for risers but found over the years that when a car hit a riser on a HV cable you could not inspect it for damage without taking it out of service to remove the conduit. We later switched to SCH-80 because it could withstand certain impacts and spring back or when damaged we could cut it away to inspect the cable and if the cable was OK we would actually split the SCH-80 (something the NEC would probably no allow) and re-install it around the cable.
I think Tom is pointing out that 300.5(4) Enclosure or Raceway Damage states that PVC SCH-80 is called out by the NEC for the protection of conductors from physical damage along with RMC and IMC and other conduits SCH-40 for example are not shown as being equal in that application. Having worked for Dept of Water & Power City of LA, in the underground for seveal years I recall we would use RMC for risers but found over the years that when a car hit a riser on a HV cable you could not inspect it for damage without taking it out of service to remove the conduit. We later switched to SCH-80 because it could withstand certain impacts and spring back or when damaged we could cut it away to inspect the cable and if the cable was OK we would actually split the SCH-80 (something the NEC would probably no allow) and re-install it around the cable.
G
Guest
Guest
Re: sch 80 nonmetalic conduit
Do you replace long sections of the SCH-80 or do you only split out the minimum that's damaged?
How do you prep the new SCH-80 make the patch? Do you fabricate the split "coupler"? Or do you have made-up two-piece (split) repair couplings?
Any pictures?
I am very interested to know how you re-install the SCH-80 around the in-place cable.
Do you replace long sections of the SCH-80 or do you only split out the minimum that's damaged?
How do you prep the new SCH-80 make the patch? Do you fabricate the split "coupler"? Or do you have made-up two-piece (split) repair couplings?
Any pictures?
BAHTAH
Senior Member
- Location
- United States
Re: sch 80 nonmetalic conduit
awwt, no pictures as this was in my younger years working in the underground (30yrs ago). Our fabrication facility made many items such as split conduit couplings & conduit etc. We would replace only the first 10ft up the pole, the balance was schedule 40 conduit. We even had RMC fabricated as split assemblies with alignment pins to make it easy to get threaded couplings installed on the split assembly. You have to realize the conduit system was only to protect the cable, the cable would not be hurt by water etc, so the split assembly did not have to be water tight. These cables were typically lead covered, gas filled 34.5KV.
awwt, no pictures as this was in my younger years working in the underground (30yrs ago). Our fabrication facility made many items such as split conduit couplings & conduit etc. We would replace only the first 10ft up the pole, the balance was schedule 40 conduit. We even had RMC fabricated as split assemblies with alignment pins to make it easy to get threaded couplings installed on the split assembly. You have to realize the conduit system was only to protect the cable, the cable would not be hurt by water etc, so the split assembly did not have to be water tight. These cables were typically lead covered, gas filled 34.5KV.
george t. everett
Senior Member
- Location
- New York
Re: sch 80 nonmetalic conduit
Schedule 80 sweeps are avialible & I think adapters. Have not seen 80 LB's or couplings.
Schedule 80 sweeps are avialible & I think adapters. Have not seen 80 LB's or couplings.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Re: sch 80 nonmetalic conduit
Doesn't it defeat the purpose if you install 80 with 40 fittings? couplings, adapters, LB's, and 90's.
There are certainly elbows- 90's 45's, 22-1/2's. They would have to be available equal to the straight length wall thickness if you don't want to bend your own.
As to LB's and other fittings, there is no need to have different ones for schedule 20, 40, 80 and 120. They are constructed substantially enough to be used with all schedules and since the OD of the pipe is always the same, a given size will fit all.
Doesn't it defeat the purpose if you install 80 with 40 fittings? couplings, adapters, LB's, and 90's.
There are certainly elbows- 90's 45's, 22-1/2's. They would have to be available equal to the straight length wall thickness if you don't want to bend your own.
As to LB's and other fittings, there is no need to have different ones for schedule 20, 40, 80 and 120. They are constructed substantially enough to be used with all schedules and since the OD of the pipe is always the same, a given size will fit all.
dcl34769
Senior Member
- Location
- saint cloud,fl
Re: sch 80 nonmetalic conduit
I am very interested to know how you re-install the SCH-80 around the in-place cable check this out for conduit repair
I am very interested to know how you re-install the SCH-80 around the in-place cable check this out for conduit repair
dcl34769
Senior Member
- Location
- saint cloud,fl
G
Guest
Guest
Re: sch 80 nonmetalic conduit
Thanks! That is exactly what I pictured for a short repair. For longer repairs I can easily picture the pinned split sleeves that grant mentioned. Very cool!
../Wayne C.
[ September 24, 2003, 11:55 PM: Message edited by: awwt ]
Thanks! That is exactly what I pictured for a short repair. For longer repairs I can easily picture the pinned split sleeves that grant mentioned. Very cool!
../Wayne C.
[ September 24, 2003, 11:55 PM: Message edited by: awwt ]
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