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riser #44070 10/27/04 09:01 AM
Joined: May 2004
Posts: 81
V
velect Offline OP
Member
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
Joined: Nov 2003
Posts: 269
E
electricman2 Offline
Member
No.


John
Re: riser #44072 10/27/04 04:57 PM
Joined: Jun 2004
Posts: 220
T
trekkie76 Offline
Member
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.

Re: riser #44073 10/27/04 05:35 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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
Re: riser #44074 10/27/04 06:16 PM
Joined: Jun 2003
Posts: 1,143
D
DougW Offline
Member
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.

Re: riser #44075 10/28/04 06:49 PM
Joined: Apr 2004
Posts: 201
CharlieE Offline
Member
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]

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Charlie Eldridge, Indianapolis Utility Power Guy

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