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Old 06-26-2019, 10:33 AM   #1
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Default Odd mast size

I haven't done much residential stuff recently but am working on a service upgrade from 100 to 200amps for someone. The thing I've run into is they have a 3" EMT mast that I can't seem to find any parts to fit aside from a weatherhead. Has anyone run into a mast this size? I think the weatherhead is good for 200amps, but there's a reducer on the bottom to 1-1/4" into the old meter box. Does anyone know if I can re-use that reducer, or do I have to replace it with 2" (which I can't find for 3" EMT)? I'd rather not replace the mast if I can re-use it.

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Old 06-26-2019, 11:03 AM   #2
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This should be fun.
I have been looking for a 200 amp weatherhead for a long time. Where did you find it.
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Old 06-26-2019, 12:43 PM   #3
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3" parts can be found at any electrical supply.
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Old 06-26-2019, 01:14 PM   #4
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This should be fun.
I have been looking for a 200 amp weatherhead for a long time. Where did you find it.
Right next to the 200A pipe.
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Old 06-26-2019, 01:35 PM   #5
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Right next to the 200A pipe.
Is that near the "220 wire"?
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Old 06-26-2019, 02:02 PM   #6
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Is that near the "220 wire"?
It's 240V

There is no such thing as 220V wire
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Old 06-26-2019, 02:29 PM   #7
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I hear that RE86's are also on the endangered species list..
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Old 06-26-2019, 05:46 PM   #8
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Sorry guys, I get it, I haven't explained it very well.

The conduit isn't threaded. I'm used to seeing a MM200M. Is there anything in the code book that says I can't reduce to 1-1/4" prior to the meter box? For that matter, I can't find anything in the code book that specifies the required mast size. Or is that a Manitoba Hydro specific thing.
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Old 06-26-2019, 06:40 PM   #9
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I have one question reguarding the EMT conduit .,, where is the POA ? is on the conduit or it on the building ?

And it is poked thru the roof ?
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Old 06-26-2019, 07:36 PM   #10
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Quote:
Originally Posted by CoolWill View Post
Is that near the "220 wire"?
Quote:
Originally Posted by HackWork View Post
It's 240V

There is no such thing as 220V wire
220 / 221 whatever it takes.

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Old 06-26-2019, 07:40 PM   #11
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Originally Posted by skruffy View Post
Sorry guys, I get it, I haven't explained it very well.

The conduit isn't threaded. I'm used to seeing a MM200M. Is there anything in the code book that says I can't reduce to 1-1/4" prior to the meter box? For that matter, I can't find anything in the code book that specifies the required mast size. Or is that a Manitoba Hydro specific thing.
Are you measuring the OD @3" ? If thats the case, then the ID is 2.5 which is a standard mast. If thats the case, a MM202 head is what you want
You'll have to go up to a 2" bottom reducer to allow for the wire size
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Last edited by wcord; 06-26-2019 at 07:44 PM.
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Old 06-26-2019, 07:46 PM   #12
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Is there anything in the code book that says I can't reduce to 1-1/4" prior to the meter box? For that matter, I can't find anything in the code book that specifies the required mast size.
Yes you must follow conduit fill rules 12-910.

200 amp conductors are too big for 1-1/4” conduit.

Also masts must be a minimum 63mm.

6-112
5) Where service masts are used, they shall be of metal and assembled from components suitable for service mast use.
6) Rigid steel conduit of a minimum nominal size of 63 trade size shall be permitted to be used for the purpose of Subrule 5), provided that all other requirements for a service mast are complied with.
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Old 06-26-2019, 08:46 PM   #13
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An EMT mast ??

Whud I missin' here
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Old 06-26-2019, 09:09 PM   #14
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An EMT mast ??

Whud I missin' here
It's probably just a scrap of EMT on the bottom. 2.5" EMT and GRC are both the same OD. Even with the cost of the compression fittings, It's still usually cheaper to extend a mast over 10' in EMT
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Old 06-26-2019, 10:19 PM   #15
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An EMT mast ??

Whud I missin' here
Yeah, I was thinking the same thing. I'm betting it's not a mast, just a riser. Here in the states it's either GRC or IMC for a mast.
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Old 06-26-2019, 11:22 PM   #16
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My bad guys. You had me wondering and eyeballing with a tape measure wasn't quite accurate. I popped the cap off an measured with calipers. ID is 2.75", OD is 3" so I'm really not sure what it is. Cap and reducer fit just right though. This stuff is older than I am.

I can get away with 3/0 copper in 1-1/4" pipe as per local inspectors. It'll be snug.

I tried posting a pic but it's not going. Link available: imgur.com/a/CcA202K
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Old 06-27-2019, 01:26 AM   #17
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Scruffy, YOU GO HIRE AN ELECTRICIAN. He will tell you what he is going to buy when he puts up your new mast.
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Old 06-27-2019, 01:32 AM   #18
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Quote:
Originally Posted by JoeSparky View Post
It's probably just a scrap of EMT on the bottom. 2.5" EMT and GRC are both the same OD. Even with the cost of the compression fittings, It's still usually cheaper to extend a mast over 10' in EMT

I've done some where I left the meter can with 2" emt, and ran the last ten up thru the rooftop with GRC conduit. But of course, you can't screw an EMT box connector into a GRC coupling cause it makes Incognito get Diarrhea. So forget I said I did it, I didn't really did it, I was joking and making it up. Everybody know's you can't screw an emt box connector into a grc coupling . Everybody knows. ..............

Best part: instead of those pricey "rain tight" emt couplings I went to Hardware Hawaii and found the right size o rings to slip up next to the compression couplings and siliconed em in place real nice. Inspector saw the o rings and complemented me for using proper raintite fittings.....lol.
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Old 06-27-2019, 08:04 AM   #19
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Originally Posted by macmikeman View Post
I've done some where I left the meter can with 2" emt, and ran the last ten up thru the rooftop with GRC conduit. But of course, you can't screw an EMT box connector into a GRC coupling cause it makes Incognito get Diarrhea. So forget I said I did it, I didn't really did it, I was joking and making it up. Everybody know's you can't screw an emt box connector into a grc coupling . Everybody knows. ..............

Best part: instead of those pricey "rain tight" emt couplings I went to Hardware Hawaii and found the right size o rings to slip up next to the compression couplings and siliconed em in place real nice. Inspector saw the o rings and complemented me for using proper raintite fittings.....lol.
You can screw a male metal into a female metal or plastic. It’s the male plastic into female metal that causes dysentery
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Last edited by Incognito; 06-27-2019 at 08:17 AM.
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Old 06-27-2019, 08:24 AM   #20
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Quote:
Originally Posted by emtnut View Post
An EMT mast ??

Whud I missin' here
I dunno. It’s one of those things that’s so obviously wrong I thought maybe it was right.
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