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 riser
#44070
10/27/04 09:01 AM
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Joined: May 2004
Posts: 81
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I have to raise a ten foot 2-1/2 IMC riser about three feet. Building is going from a flat roof to a trussed one.
Can I use a 3 foot piece of PVC between the meter base and the 10 foot IMC without bonding issues
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 Re: riser
#44071
10/27/04 10:40 AM
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Joined: Nov 2003
Posts: 269
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John
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Re: riser
#44072
10/27/04 04:57 PM
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Joined: Jun 2004
Posts: 220
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how did you get your 8 ft above the flat roof if you don't have the clearance over the trussed roof? you would be isolating the IMC from the grounding in the meter base.
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 Re: riser
#44073
10/27/04 05:35 PM
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Joined: Jan 2003
Posts: 4,391
Moderator
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You could bond the riser at the top end to the neutral if you want.
Personally I would only extend this with the same type of raceway.
Bob
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Re: riser
#44074
10/27/04 06:16 PM
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Joined: Jun 2003
Posts: 1,143
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I know around here you can't use anything for mast except steel RMC. Even though it isn't part of the immediate load bearing portion of the service entrance, I'd think it would still be subject to torsion from wind, etc, and I'd use IMC like the original section.
Check with your AHJ, but they'll probably insist on the use of IMC.
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 Re: riser
#44075
10/28/04 06:49 PM
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Joined: Apr 2004
Posts: 201
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Don't leave out the serving electric utility since it will be their service cable that will be hitting the service mast. If it doesn't meet their requirements, you may not get hooked up. ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif) - - - - - - - - - - - - - - - - - - - - - - - - - - - Charlie Eldridge, Indianapolis, Utility Power Guy
Charlie Eldridge, Indianapolis Utility Power Guy
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