Underground Elbows

[Alwayslearningelec]

Most of time spec for underground PVC reads "elbows to be RGS conduit". It's not specific saying elbow turning up from underground ot aboveground.

Is it necessary to provide these RGS elbows for 90's that remain underground( horizontal bend) and if not why?

I know they are worried about pulling tension and busting through the elbow.

 

[infinity]

I know they are worried about pulling tension and busting through the elbow.

That's the concern. I think that I would rather use fiberglass conduit (Reinforced Thermosetting Resin Conduit) instead of PVC with metal elbows.

 

[ron]

elbows are elbows, whether they are underground or turning up. RGS if that is what is specified.

 

[Little Bill]

That's the concern. I think that I would rather use fiberglass conduit (Reinforced Thermosetting Resin Conduit) instead of PVC with metal elbows.

Never heard of that conduit, and for sure our SH don't carry it.

 

[augie47]

i've used them and, at the time, they were more expensive than steel but they were available with integral PVC couplings reducing install time and they were lighter as I recall.

 

[Strathead]

i've used them and, at the time, they were more expensive than steel but they were available with integral PVC couplings reducing install time and they were lighter as I recall.

Way lighter. Lighter than PVC even. An awesome product that just hasn't gotten any footing.

 

[618electrician]

elbows are elbows, whether they are underground or turning up. RGS if that is what is specified.

where do i find elbows in the 2020 NEC ??????????

 

[infinity]

where do i find elbows in the 2020 NEC ??????????

What are you specifically looking for? The word elbow appears in about 20 code Articles.

 

[don_resqcapt19]

where do i find elbows in the 2020 NEC ??????????

often called factory 90s in the field

 

[augie47]

The only pertinent Code Section I can think of is 250.80 which requires metal raceways to be bonded and exempts metal components underground with 18" of cover.
So if you have a metallic elbow in a PVC run and it is not 18" below grade the fiberglass elbow would make even m ore sense.