Service riser max height without supports...
- Thread starter jango
- Start date
- Status
- Location
- Massachusetts
It's a utility question.
The info is likely on your utility's web site.
The info is likely on your utility's web site.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
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.
paul
Senior Member
- Location
- Snohomish, WA
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.
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.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
tmbrk said:
3" for 3-#2/0 cu conductors is rather ridiculous don't you think?
Yes I do. It can't be that much more windy here.
View attachment 294
View attachment 294
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
Con Edison, NY requires 2 inches and no more than 59 inches above the roof before support of the mast is required.
jango
Senior Member
celtic said:
Thanks, I can see location is quite relative. I am in the Bay Area in California. I see new over head risers in new construction and remodels quite often where the over head rigid conduit size is 1 1/2" for 200A. I cannot find anything on the web to support or deny this. Specifically, the project is in San Carlos, CA 94070. Any help on this would be very much appreciated. :smile:
curt swartz
Senior Member
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Look at this document:
http://www.pge.com/docs/pdfs/customer_service/new_construction_services/greenbook/service_requirements/06.pdf
Edited to remove suggested page.
http://www.pge.com/docs/pdfs/customer_service/new_construction_services/greenbook/service_requirements/06.pdf
Edited to remove suggested page.
Last edited:
In case anyone from NJ doesn't have a copy of PSE&G's "green book" on their computer....happy downloading:
http://www.pseg.com/customer/business/new_service/pdf/RequirementsElecSvc2005.pdf
http://www.pseg.com/customer/business/new_service/pdf/RequirementsElecSvc2005.pdf
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Article 230.28 Service Masts as Supports. it shall be of adequate strength or be supported by braces or guys to withstand safely the strain imposed by the service drop. It appears the NEC leaves that up to the AHJ to say what is safe but I agree with Bob the podco will decide what they will hook to. Personally I have never seen a mast under 2" rigid. Also the distance from the podco pole to the mast will also be a factor in strength.jango said:
ceknight
Senior Member
jango said:
If you're dealing with PGE, see http://www.pge.com/docs/pdfs/custom...ervices/greenbook/service_requirements/06.pdf
- Status