Pvc

[Shockedby277v]

I'm having a brainmelt. Sch 40 PVC has the thinner wall as compared to Sch 80???

 

[mdshunk]

You are correct.

Schedule 80 PVC is the only nonmetallic conduit rated for protection against physical damage, by the way.

 

[Jim W in Tampa]

This is why they are listed seperatly.You can not get as many wires in 80.Life was good before they did this.

 

[stickboy1375]

Do they make LB's in SCH 80? I was just driving home tonight and saw what was left of a LB off a service entering a business...See how long that stays like that....

 

[mdshunk]

They make sweeps in sch 80, but I think fittings come one way. Schedule nothing or maybe, schedule average.

 

[stickboy1375]

Yeh, I'm not a big fan of PVC on commericial buildings, they always seem to take to much abuse....

 

[mdshunk]

From the Carlon website:

We are a local inspection agency. As you know the use of schedule 40-pvc has been greatly limited in the 2002 NEC. There is a story going around that schedule 80 fittings are not available. We will be enforcing the 2002 NEC Code if these fitting are not available that will mean that sales of schedule 40-and 80-pvc just took a turn for the worst. If these fittings are not available why is that true schedule 80-nonmetallic conduit is not a new product? What is the true story?​

Carlon does not manufacture separate fittings for Schedule 40 and separate fittings for Schedule 80 (except for the elbows which are formed from Sch. 40 and Sch. 80 conduit and fall under the UL category of conduit, not fittings) since the fittings have been UL approved to be used with both Schedule 40 and Schedule 80.​

Schedule 40 PVC has not necessarily been severely limited as Schedule 80 is only required in areas subject to physical damage, which is usually a limited height coming out of the ground along the exterior wall of a building (Articles 300.5 (4) and 352.12(C)), for example, or in a parking garage or up along a pole. Subject to physical damage areas are where a car or lawnmower or something will impact the conduit. The uses not permitted for RNC for areas subject to physical damage unless identified for such use has been around for quite awhile and Schedule 80 has always been permitted for areas subject to physical damage. This is nothing new.

PVC conduit and fittings have been listed since the 1960's. Schedule 80 has a thicker wall than Schedule 40. They both have the same OD but different ID's and thus a different wirefill. The fittings are either over or under the conduit anyways, so even if they are impacted, the conduit is still there to provide the impact protection.​

Remember, most damage occurs by not using expansion fittings, because the force of contraction/expansion can be great enough to pull apart joints.​

 

[stickboy1375]

The fittings are either over or under the conduit anyways, so even if they are impacted, the conduit is still there to provide the impact protection.



Hahah thats funny, they should go look at the LB I saw and tell me what they think then... It's actually the 2nd LB I saw broken... Both of which were in a parkinglot / driveway... lots of traffic...

 

[macmikeman]

If it is in a parking lot/ driveway, go put some grc in there instead, and watch how fast that is all flatened out and wrecked. In that enviroment, there is no real safe place, if it is there some one will hit it with a car.