ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#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?
Top
Work Gear for Electricians and the Trades
#196094 - 09/13/10 10:04 AM Re: 2 inch rigid service mast [Re: evad73]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
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).
_________________________
Greg Fretwell
Top
#196096 - 09/13/10 10:19 AM Re: 2 inch rigid service mast [Re: gfretwell]
Niko Offline
Member
Registered: 08/17/06
Posts: 356
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.
_________________________
Be kind to your neighbor, he knows where you live

Top
#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: 5316
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.
Top
#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."
Top
#196100 - 09/13/10 11:31 AM Re: 2 inch rigid service mast [Re: evad73]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
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
_________________________
Greg Fretwell
Top
#196110 - 09/13/10 10:22 PM Re: 2 inch rigid service mast [Re: Niko]
NORCAL Offline
Member
Registered: 09/25/02
Posts: 865
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....
Top
#196111 - 09/13/10 11:04 PM Re: 2 inch rigid service mast [Re: NORCAL]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
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
_________________________
Greg Fretwell
Top
#196112 - 09/13/10 11:06 PM Re: 2 inch rigid service mast [Re: evad73]
Bill Addiss Offline
Member
Registered: 10/07/00
Posts: 3875
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
Top
#196125 - 09/14/10 11:53 AM Re: 2 inch rigid service mast [Re: Bill Addiss]
mikesh Offline
Member
Registered: 06/07/06
Posts: 613
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.
Top

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 54 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals