I have a 200 service with an 1 1/2 Rigid riser and I'm wondering what the max height is beyond the roof/foof jack without needing braces or guys. I can't find it in the NEC, perhaps it's a local utilities question. Please advise.
It's a utility question.
The info is likely on your utility's web site.
Around here the minimum size RMC permitted for a service mast used to support the service drop is 2". If we ran 1.5" the POCO wouldn't hook us up. The POCO also has the requirements for supported and unsupported masts.
Here's our state drawings on the subject. No mast under 2" rigid.
Notes to drawings E-101, E-102, and E-103
(1) An approved roof flashing must be installed on each mast where it passes through a roof. Plastic, nonhardening mastic must be placed between lead-type flashings and the conduit. Neoprene type flashings will also be permitted to be used.
(2) Masts must be braced, secured, and supported in such a manner that no pressure from the attached conductors will be exerted on a roof flashing, meter base, or other enclosures.
(3) Utilization of couplings for a mast are permitted only below the point the mast is braced, secured, or supported.
(4) Except as otherwise required by the serving utility, service mast support guys must be installed if the service drop attaches to the mast more than twenty-four inches above the roof line or if the service drop is greater than one hundred feet in length from the pole or support. Masts for support of other than service drops must comply with this requirement as well.
(5) Intermediate support masts must be installed in an approved manner with methods identical or equal to those required for service masts.
(6) For altered services, where it is impractical to install U bolt mast supports due to interior walls remaining closed, it will be permissible to use other alternate mast support methods such as heavy gauge, galvanized, electrical channel material that is secured to two or more wooden studs with five-sixteenths inch diameter or larger galvanized lag bolts.
(7) Conductors must extend at least eighteen inches from all mastheads to permit connection to the connecting overhead wiring.
