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2 inch rigid service mast #196093 09/13/10 12:47 PM
Joined: Oct 2009
Posts: 10
evad73 Offline OP
Member
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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Re: 2 inch rigid service mast [Re: evad73] #196094 09/13/10 01:04 PM
Joined: Jul 2004
Posts: 9,575
G
gfretwell Offline
Member
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).


Greg Fretwell
Re: 2 inch rigid service mast [Re: gfretwell] #196096 09/13/10 01:19 PM
Joined: Aug 2006
Posts: 356
Niko Offline
Member
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.


Be kind to your neighbor, he knows where you live

Re: 2 inch rigid service mast [Re: gfretwell] #196097 09/13/10 01:19 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
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.

Re: 2 inch rigid service mast [Re: evad73] #196099 09/13/10 01:41 PM
Joined: Oct 2009
Posts: 10
evad73 Offline OP
Member
Thanks, Xcel Energy "Service masts shall be 2" minimum GRC metallic conduit."

Re: 2 inch rigid service mast [Re: evad73] #196100 09/13/10 02:31 PM
Joined: Jul 2004
Posts: 9,575
G
gfretwell Offline
Member
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


Greg Fretwell
Re: 2 inch rigid service mast [Re: Niko] #196110 09/14/10 01:22 AM
Joined: Sep 2002
Posts: 908
N
NORCAL Offline
Member
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....

Re: 2 inch rigid service mast [Re: NORCAL] #196111 09/14/10 02:04 AM
Joined: Jul 2004
Posts: 9,575
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gfretwell Offline
Member
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


Greg Fretwell
Re: 2 inch rigid service mast [Re: evad73] #196112 09/14/10 02:06 AM
Joined: Oct 2000
Posts: 3,974
Bill Addiss Offline
Member
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

Last edited by Bill Addiss; 09/14/10 02:14 AM. Reason: added link
Re: 2 inch rigid service mast [Re: Bill Addiss] #196125 09/14/10 02:53 PM
Joined: Jun 2006
Posts: 613
M
mikesh Offline
Member
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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