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04-09-2010, 10:21 PM
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#1
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Senior Member
Join Date: Nov 2007
Posts: 298
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Preference for service masts
If you have a choice, do you use IMC, EMT or RNC for your service mast/drop?
I see lots of magazine advertisements for PVC weatherheads, and I was wondering if anyone ever routinely use them versus metallic weatherheads.
Thanks,
Rick
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04-09-2010, 10:22 PM
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#2
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,313
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IMC. Never touched a PVC weatherhead. Can't say I've even seen one in the wild.
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-09-2010, 10:38 PM
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#3
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Senior Member
Join Date: Sep 2008
Location: Charlotte, N.C.
Posts: 11,079
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I have installed quite a few PVC weather heads, but all of them were for temporary services. I have used 2 1/2"--3" and 4" PVC weather heads.
If it is a permeate installation I would use IMC.
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04-09-2010, 11:56 PM
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#4
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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Depends. There are alot of services that I must use imc. If not, I like emt...My old boss loved using pvc...but I really prefer emt.
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04-09-2010, 11:59 PM
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#5
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,313
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Quote:
Originally Posted by NolaTigaBait
Depends. There are alot of services that I must use imc. If not, I like emt...My old boss loved using pvc...but I really prefer emt.
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I can see EMT and PVC for a riser, but certainly not for a mast.
Unless you like doing the job more than once.  
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-10-2010, 12:00 AM
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#6
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I have a black cat.
Join Date: Oct 2009
Location: Oakland, Ca
Posts: 4,021
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IMC.
Never seen a pvc one, sounds pretty cool.
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04-10-2010, 12:12 AM
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#7
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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Quote:
Originally Posted by 480sparky
I can see EMT and PVC for a riser, but certainly not for a mast.
Unless you like doing the job more than once. |
Guess, I didn;t read it carefully...You know what I meant.
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04-10-2010, 12:13 AM
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#8
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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Why would you even use a pvc weatherhead on imc? Don't they cost more?
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04-10-2010, 12:16 AM
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#9
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hiamp
Join Date: Mar 2010
Location: Washington State
Posts: 84
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We use PVC weatherheads quite often here in Washington because of the moisture (they don't rust). If the strike is on the house, we use PVC for the mast also. If the strike has to be on the mast, we must use IMC. Never have used EMT for a mast.
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04-10-2010, 12:35 AM
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#10
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,313
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Quote:
Originally Posted by hiamp
We use PVC weatherheads quite often here in Washington because of the moisture (they don't rust). If the strike is on the house, we use PVC for the mast also. If the strike has to be on the mast, we must use IMC. Never have used EMT for a mast.
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Strike? 
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-10-2010, 12:43 AM
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#11
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hiamp
Join Date: Mar 2010
Location: Washington State
Posts: 84
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Quote:
Originally Posted by 480sparky
Strike? |
Strike plate or Knob
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04-10-2010, 01:09 AM
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#12
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,313
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Quote:
Originally Posted by hiamp
Strike plate or Knob
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I thought we were talking electrical masts, not doors. 
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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04-10-2010, 01:56 AM
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#13
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Senior Member
Join Date: Sep 2007
Location: Phoenix, AZ
Posts: 5,393
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Everything is IMC or RMC here.
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04-10-2010, 03:57 AM
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#14
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Senior Member
Join Date: Mar 2010
Location: Welland, Ontario Canada
Posts: 170
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In Ontario pretty much, if the insulator is attached to the wall and you have the height, most will use PVC. Other then that you are using a rigid stack for overhead services.
Some places will allow a Teck90 or Corflex for service conductors overhead, but in 20 + years I have only done that once. I believe that Teck90 is common in British Columbia (quake zone).
Cheers
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04-10-2010, 07:04 AM
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#15
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Senior Member
Join Date: Sep 2008
Location: Charlotte, N.C.
Posts: 11,079
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Quote:
Originally Posted by 480sparky
I thought we were talking electrical masts, not doors. |
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04-10-2010, 08:46 AM
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#16
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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If it's a riser, I use either SE cable or PVC
If it's a mast, I normally use IMC. If it's an especially tall mast, that will need guyed back, I use RMC.
I've only used EMT for a riser one time, and that was due to cost.
__________________
One reason not to give DIY advice:
Catch a man a fish and you can sell it to him.
Teach a man to fish and you’ve ruined a good business opportunity.
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04-10-2010, 11:48 AM
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#17
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hiamp
Join Date: Mar 2010
Location: Washington State
Posts: 84
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Quote:
Originally Posted by 480sparky
I thought we were talking electrical masts, not doors. |
What do you call the attachment that the power co hooks their wire to?
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04-10-2010, 12:10 PM
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#18
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Senior Member
Join Date: Mar 2010
Location: Welland, Ontario Canada
Posts: 170
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I should put this int he "Slang Thread", here we call them insulators or spool racks. I believe the Canadian code calls them Point of Attachment. Never thought about it actually, I have generally called them spool racks.
Cheers
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04-10-2010, 02:15 PM
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#19
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Moderator
Join Date: May 2009
Location: Chapel Hill, NC
Posts: 12,043
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Just to be clear, a mast is not the same as a riser. The main difference is a mast usually penetrates the roof and extends upward of the roof line. Here it is RMC.
In terms of a riser we always use PVC with a PVC weatherhead. That being said most of our jobs are underground. 
__________________
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04-10-2010, 02:29 PM
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#20
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I have a black cat.
Join Date: Oct 2009
Location: Oakland, Ca
Posts: 4,021
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Quote:
Originally Posted by hiamp
What do you call the attachment that the power co hooks their wire to?
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Screw knobs screw on the side of the house, a mast collar collars the mast.
I think.
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