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#44070 - 10/27/04 10:01 AM riser  
velect  Offline
Member
Joined: May 2004
Posts: 81
st joseph mi usa
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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#44071 - 10/27/04 11:40 AM Re: riser  
electricman2  Offline
Member
Joined: Nov 2003
Posts: 269
Thomasville, NC USA
No.


John

#44072 - 10/27/04 05:57 PM Re: riser  
trekkie76  Offline
Member
Joined: Jun 2004
Posts: 220
baileyville, maine, usa
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.


#44073 - 10/27/04 06:35 PM Re: riser  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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

#44074 - 10/27/04 07:16 PM Re: riser  
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
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.


#44075 - 10/28/04 07:49 PM Re: riser  
CharlieE  Offline
Member
Joined: Apr 2004
Posts: 200
Indianapolis
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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