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#196093 - 09/13/10 09:47 AM 2 inch rigid service mast
evad73 Offline
Member

Registered: 10/23/09
Posts: 10
Loc: minnesota,USA
Where in the code do you find size of service mast rigid pipe thru a roof? Does it need to be 2 inch?

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#196094 - 09/13/10 10:04 AM Re: 2 inch rigid service mast [Re: evad73]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
238.28 just says "... it shall be of adequate strength or be supported by braces or guys to withstand safely the strain imposed by the service drop."

This is not a design manual wink

You probably have a local interpretation that makes that 2" or larger. but the NEC only defines the size in the sense that it has to be able to contain the service entrance conductors (raceway fill).
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#196096 - 09/13/10 10:19 AM Re: 2 inch rigid service mast [Re: gfretwell]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
The requirement is from your local power company.
This part of CA, PG&E requires a minimum of 1.25" IMC or RMC for overhead service if the service will be attached to the mast. The size will also depends on conduit fill.
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#196097 - 09/13/10 10:19 AM Re: 2 inch rigid service mast [Re: gfretwell]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: Blue Collar Country
The actual specifics of a service drop are found in your Power Company's standards. Most PoCo's have these specifications availble, free, over the internet.

2" rigid or IMC is a common requirement. Also pay close attention to the additional bracing requirements if the mast extends more than 30" above the roof.

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#196099 - 09/13/10 10:41 AM Re: 2 inch rigid service mast [Re: evad73]
evad73 Offline
Member

Registered: 10/23/09
Posts: 10
Loc: minnesota,USA
Thanks, Xcel Energy "Service masts shall be 2" minimum GRC metallic conduit."

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#196100 - 09/13/10 11:31 AM Re: 2 inch rigid service mast [Re: evad73]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
It is the PoCo that ultimately decides if this is a service mast or a flag pole* so you have to go by what they say.

(*as in, if they won't hook up power it is a flagpole) wink
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#196110 - 09/13/10 10:22 PM Re: 2 inch rigid service mast [Re: Niko]
NORCAL Offline
Member

Registered: 09/25/02
Posts: 805
Originally Posted By: Niko
The requirement is from your local power company.
This part of CA, PG&E requires a minimum of 1.25" IMC or RMC for overhead service if the service will be attached to the mast. The size will also depends on conduit fill.


I learned the hard way that SMUD's (Sacramento Muni. Utility District) has a 1 1/2" min size, found out before it was installed but was a pain....

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#196111 - 09/13/10 11:04 PM Re: 2 inch rigid service mast [Re: NORCAL]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
These days the PoCos usually have their service design specifications online so it is worth downloading that and printing it out.

FPL is here

http://www.fpl.com/doingbusiness/builder/contents/ESS_toc.shtml
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#196112 - 09/13/10 11:06 PM Re: 2 inch rigid service mast [Re: evad73]
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Minimum 2-1/2" Rigid here on Long Island (NY) if it supports the service drop.

Some local Utility requirements:

http://www.lipower.org/pdfs/commercial/redbook/Chapter11.pdf

Bill


Edited by Bill Addiss (09/13/10 11:14 PM)
Edit Reason: added link

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#196125 - 09/14/10 11:53 AM Re: 2 inch rigid service mast [Re: Bill Addiss]
mikesh Offline
Member

Registered: 06/07/06
Posts: 614
Loc: Victoria, BC, Canada
In Canada About 2 codes ago the 2 inch rigid pipe as a mast was replaced by an approved mast which when field measured turns out to be more like a schedule 80 2 1/2" rigid steel pipe without the threaded ends and available in 10 and 12 foot lengths. Although rare some 2" pipes were getting bent.
There is a set screw adaptor to convert from the mast to a 2" threaded hub on top of the meter base.

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