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Old 4/16/18, 9:30 AM
Lawrence C. Cochran, Jr. Lawrence C. Cochran, Jr. is offline
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Default NEC PVC SEC fastener spacing

Hello All,

Can someone point me to where in the NEC (2017) it states the proper fastener spacing for a service entrance cable running through PVC conduit?

I've found the following:
Ok to use PVC...
230.50B(3) Protection Against Physical Damage: SEC. Sched 80 PVC

Fastener spacing for cable--does that include SEC in PVC conduit?
230.51(A) Mounting Support: SEC. Max: 12" from ends and every 30"

Spacing for PVC. Does that include use for SEC?
352.30(A) Securing and Supporting: PVC. Within 3' of outlet or term.
Table 352.30: Support 2.5" to 3" PVC every 6'

An electrician told me that 230.51(A) applies, but I say that assumes the cable is not in PVC conduit. I say 352.30(A) with its accompanying table applies even if it's application is SEC. But I don't see where the code explicitly says use the PVC rules for SEC, so I could be wrong.

Thanks in advance for sharing your expertise.

--Larry
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  #2  
Old 4/16/18, 10:02 AM
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Default Re: NEC PVC SEC fastener spacing

Is the run of PVC just used a sleeve or is it a complete conduit run?
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Old 4/16/18, 10:44 AM
Lawrence C. Cochran, Jr. Lawrence C. Cochran, Jr. is offline
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Default Re: NEC PVC SEC fastener spacing

I think it's separate cables, so that would be a conduit. Would that change the fastener spacing?
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Old 4/16/18, 11:14 AM
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Default Re: NEC PVC SEC fastener spacing

Quote:
Originally Posted by lcochran View Post
I think it's separate cables, so that would be a conduit. Would that change the fastener spacing?
Typically there is only one service cable to the house. Perhaps you mean conductors ?

A service riser run in PVC would use the spacing rules for PVC raceways. It does not matter the usage whether service or branch circuit .
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Old 4/16/18, 11:25 AM
Jim Port Jim Port is online now
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Default Re: NEC PVC SEC fastener spacing

Quote:
Originally Posted by lcochran View Post
Hello All,

Can someone point me to where in the NEC (2017) it states the proper fastener spacing for a service entrance cable running through PVC conduit?

I've found the following:
Ok to use PVC...
230.50B(3) Protection Against Physical Damage: SEC. Sched 80 PVC

Fastener spacing for cable--does that include SEC in PVC conduit?
230.51(A) Mounting Support: SEC. Max: 12" from ends and every 30"

Spacing for PVC. Does that include use for SEC?
352.30(A) Securing and Supporting: PVC. Within 3' of outlet or term.
Table 352.30: Support 2.5" to 3" PVC every 6'

An electrician told me that 230.51(A) applies, but I say that assumes the cable is not in PVC conduit. I say 352.30(A) with its accompanying table applies even if it's application is SEC. But I don't see where the code explicitly says use the PVC rules for SEC, so I could be wrong.

Thanks in advance for sharing your expertise.

--Larry
Article 230 applies to services. It does not cover the installation requirements for service entrance cable. There is no way to fasten a cable inside a raceway . Article 338 covers the spacing of clamps for SE cables.
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Old 4/16/18, 2:59 PM
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Default Re: NEC PVC SEC fastener spacing

Quote:
Originally Posted by lcochran View Post
I think it's separate cables, so that would be a conduit. Would that change the fastener spacing?
Complete raceway systems have specific requirements based on the type of raceway, sleeves on the other hand have no defined securing requirements so if you have a short section of raceway used as a sleeve the NEC is silent on how sleeves are to be supported. It would be up to the AHJ to decide if it's supported properly. IMO if you followed the support section of the particular raceway code Article you would be OK.
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