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#111064 - 08/29/06 09:33 PM Roof Service  
Admin  Offline

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Quote
I took this one today. It is a new pole barn addition to an existing building. They wanted a final for Certificate of Occupancy.

- Alan Nadon
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#111065 - 08/29/06 10:11 PM Re: Roof Service  
NORCAL  Offline
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Joined: Sep 2002
Posts: 874
Is the triplex laying on the roof? [Linked Image]


#111066 - 08/30/06 06:52 AM Re: Roof Service  
steve ancient apprentice  Offline
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Joined: Mar 2005
Posts: 169
west springfield,mass
Dont have a code book in front of me but I know there is a conductor clearance above roofs, driveways,roads,and yards. No pass on the inspection here. Someone needs to read the book.


#111067 - 08/30/06 06:38 PM Re: Roof Service  
iwire  Offline
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Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Assuming those conductors are under the control of the utility they are outside the scope of the NEC.

90.2(B)(5)(a)


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#111068 - 08/30/06 06:52 PM Re: Roof Service  
kale  Offline
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Joined: Nov 2002
Posts: 174
Quote
Assuming those conductors are under the control of the utility they are outside the scope of the NEC.


But wouldn't the construction of the addition itself be covered by the NEC?
So if the clearance isn't there, then the building should not be constructed. Am I right?


#111069 - 08/30/06 06:59 PM Re: Roof Service  
iwire  Offline
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Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I am sure many would agree with that and you all may be correct.

However in my opinion these conductors if owned by the utility are invisible to the NEC.

Even the terms 'service drop' and 'service conductor' are defined in the NEC as being on the customer side of the service point.

In my area the service point is at the weather head putting the overhead conductors outside NEC control.

The NESC most likely has rules against this as well if the power company was made away of this they might well have a fix for it.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#111070 - 08/30/06 09:38 PM Re: Roof Service  
HLCbuild  Offline
Member
Joined: Dec 2004
Posts: 209
Herndon,Va USA
iwire...I'm confused. You quoted 90.2(B)(5)(a)and I understand the wording, but is not 230.24 (A) Clearances for Service drops above roofs...in direct conflict with this?


#111071 - 08/31/06 04:44 AM Re: Roof Service  
iwire  Offline
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Posts: 4,391
North Attleboro, MA USA
230.24(A) would apply if the service drop was not owned by, and under the control of the utility.

If the 'service point' was determined to be at the pole and the EC installed from that point than the NEC would pick it up at that point.

Like I mentioned before if you go to article 100 you find that all references to 'service conductors' are on the customer side of the utility service point.

If the NEC applied to the power company service drop there would be other violations as well.

The service conductors are to small (per NEC)

The service conductors are not listed in 310.13

The service conductors are not marked as required.

We can't pick and choose which sections of the NEC apply to utility conductors....none of them apply.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#111072 - 08/31/06 02:12 PM Re: Roof Service  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
It looks to me as if the mast would require some guide wires. It doesn't look secure being @4' higher than the last support.


#111073 - 08/31/06 06:56 PM Re: Roof Service  
HLCbuild  Offline
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Joined: Dec 2004
Posts: 209
Herndon,Va USA
iwire, thanks for the explaination. That makes it much clearer for me.



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