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Old 08-14-2012, 04:39 PM   #1
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PVC Sch 80 to metal LB - grounding necessary?


Is there any NEC code issue when using a metal LB in between runs of PVC?

I'm using about 5' of Sch 80 PVC outdoor, buried, as it leaves from the crawlspace of my home and comes up in through the concrete slab of a workshop. The LB will be used to send the wire out from the crawl and down to the trench. Sch 80 is being used because of possible impact at a sidewalk area. I don't think they make a Sch 80 LB so I picked up a metal LB with an adapter.

Thanks for the help.


Last edited by RM575; 08-15-2012 at 12:22 PM. Reason: Title Change
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Old 08-14-2012, 05:28 PM   #2
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PVC Sch 80 to metal LB - grounding necessary?


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Is there any NEC code issue when using a metal LB in between runs of PVC?

I'm using about 5' of Sch 80 PVC outdoor, buried, as it leaves from the crawlspace of my home and comes up in through the concrete slab of a workshop. The LB will be used to send the wire out from the crawl and down to the trench. Sch 80 is being used because of possible impact at a sidewalk area. I don't think they make a Sch 80 LB so I picked up a metal LB with an adapter.

Thanks for the help.
PVC pipe fittings fit both schedule 40 and schedule 80 pvc pipe. The inside diameter of 80 is smaller.


Last edited by brric; 08-14-2012 at 08:17 PM.
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Old 08-14-2012, 06:29 PM   #3
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PVC Sch 80 to metal LB - grounding necessary?


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PVC pipe fittings fit both schedule 40 and schedule 80 pvc pipe. The inside diameter or 80 is smaller.

Thanks for the reply. But, I'm wondering about any requirement about strength or durability with the PVC pipe fitting when installed in areas where it could be hit by something like close to a walkway. I thought that's why schedule 80 is required in those areas. So, if schedule 80 pipe is required, do the PVC fittings such as LB's have to be Sched 80 too? Is there such a thing as pipe fittings (LB's) in Schedule 80? Or are pipe fittings not required to be classed that way?
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Old 08-14-2012, 07:37 PM   #4
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PVC Sch 80 to metal LB - grounding necessary?


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Originally Posted by RM575 View Post
Is there any NEC code issue when using a metal LB in between runs of PVC?

I'm using about 5' of Sch 80 PVC outdoor, buried, as it leaves from the crawlspace of my home and comes up in through the concrete slab of a workshop. The LB will be used to send the wire out from the crawl and down to the trench. Sch 80 is being used because of possible impact at a sidewalk area. I don't think they make a Sch 80 LB so I picked up a metal LB with an adapter.

Thanks for the help.
The metal LB has to be grounded.
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Old 08-15-2012, 10:08 AM   #5
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PVC Sch 80 to metal LB - grounding necessary?


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The metal LB has to be grounded.

Thank you for the reply. Would you have a NEC section I can look up? I have the 2008 edition.

Also, is there such thing as a Schedule 80 PVC LB?

Or, would you know what the right fitting or method would be to send the conduit into the crawlspace from a trench where the conduit would be exposed about 12" as it transitions from the side of the home to the trench at a walkway?
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Old 08-15-2012, 10:47 AM   #6
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PVC Sch 80 to metal LB - grounding necessary?


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Thank you for the reply. Would you have a NEC section I can look up? I have the 2008 edition
Without more looking, I would think that 250.4 (A) (4) would be applicable. There may be more
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Old 08-15-2012, 11:35 AM   #7
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PVC Sch 80 to metal LB - grounding necessary?


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Without more looking, I would think that 250.4 (A) (4) would be applicable. There may be more

Thanks. I looked that up and it mentions ..."Bonding of Electrically Conductive Materials and Other Equipment."

So, lets say that I want to use a PVC LB in this area. Is there an LB, besides metal, that would be allowed in this area? Is there such a thing as Schedule 80 PVC LB? I've searched for a PVC LB with that rating and can't seem to get this answered.
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Old 08-15-2012, 12:50 PM   #8
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PVC Sch 80 to metal LB - grounding necessary?


Does anyone know of any PVC LB's with a rating of Schedule 80?
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Old 08-15-2012, 02:35 PM   #9
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PVC Sch 80 to metal LB - grounding necessary?


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Old 08-15-2012, 03:04 PM   #10
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PVC Sch 80 to metal LB - grounding necessary?


I found the answer. The Type LB conduit#5133665, made by Cantex, is interchangeable with Schedule 40 and Schedule 80. So, the answer is "yes" they do make a pvc Type LB fitting for Schedule 80 pvc pipe. I emailed their tech dept at techinfo@cantexinc.com and their rep replied that their LB's are interchangeable. Carlon most likely has an equivalent product.
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Old 08-15-2012, 04:04 PM   #11
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PVC Sch 80 to metal LB - grounding necessary?


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PVC pipe fittings fit both schedule 40 and schedule 80 pvc pipe. The inside diameter of 80 is smaller.
That answer was already given to you in this post.

Or were you looking for a LB with the wall thickness of schedule 80? I don't think there is such a thing.
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Old 08-15-2012, 04:11 PM   #12
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PVC Sch 80 to metal LB - grounding necessary?


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That answer was already given to you in this post.

Or were you looking for a LB with the wall thickness of schedule 80? I don't think there is such a thing.
The "fit" is not my concern.

I was looking for an LB that will pass inspection for the durability factor. As I understand it, Schedule 40 pipe cannot be used where it might receive impact damage, such as near a walkway.

So, it is looking like the PVC LB's made are for both pipe, schedule 40 and 80 pipe. There doesn't appear to be a PVC LB dessignated as Schedule 80. I guess the inspector will only be concerned about the pipe and not the LB.
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Old 08-15-2012, 05:58 PM   #13
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PVC Sch 80 to metal LB - grounding necessary?


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The "fit" is not my concern.

I was looking for an LB that will pass inspection for the durability factor. As I understand it, Schedule 40 pipe cannot be used where it might receive impact damage, such as near a walkway.

So, it is looking like the PVC LB's made are for both pipe, schedule 40 and 80 pipe. There doesn't appear to be a PVC LB dessignated as Schedule 80. I guess the inspector will only be concerned about the pipe and not the LB.
What type of impact is likely at a walkway?
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Old 08-15-2012, 06:31 PM   #14
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PVC Sch 80 to metal LB - grounding necessary?


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What type of impact is likely at a walkway?

Lawnmower, bicycles, etc. basically anything that can be pushed or roll into the pipe that may damage the pipe and it's conductors within the pipe.

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