QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

FYI:

In the LIPA (POCO) territory on Long Island a Mast between 5' and 7' 6" above last support must be 3-1/2in Rigid minimum. If this was really 8 ft it would require 4in Rigid minimum.

Source: >> LIPA Drawings (PDF file)
(see page 9 Drawing D7)

Bill

(edited to add specific location of info referenced)

[ January 05, 2004, 06:05 PM: Message edited by: bill addiss ]

 

[iwire]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Bill that is what I expected to find in the Green book for this POCO.

Instead it seems they opted to stay out of it with a simple "it's your problem" statement.

So now it seems I could do what ever I want and they have to hook up to it. :roll:

 

[russ]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

By me it's 2&1/2 for 100amp and 3inch for long drops or 200amp.

PS
Bracket for overhead only allowed 4&1/2 foot above the highest anchor on the conduit.
So it would require a guide wire. (or is it guy wire)

[ January 05, 2004, 06:12 PM: Message edited by: russ ]

 

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

So now it seems I could do what ever I want and they have to hook up to it.

Bob,

I don't know if I'd believe that

It sounds like it's going to be up to someone's idea of solidly supported. I'd rather have it spelled out so I know what I have to do.

Bill

 

[iwire]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Originally posted by bill addiss:
I don't know if I'd believe that

It sounds like it's going to be up to someone's idea of solidly supported. I'd rather have it spelled out so I know what I have to do.

Yes and that would depend on what crew rolled up to the job.

I again agree with you, give me something clearly spelled out.

Here is all I could find in their Green Book

Service mast minimum 2 1/2" galvinized rigid or intermediate metal conduit as required by NEC

1. Customer is responsible for structural integrity of service mast.

2. Guy is required for service mast in excess of 1000 lbs or for increased mast height

 

[Ed MacLaren]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Just wondering if many of you guys use the kind of "mast kit" components illustrated below.

The kit consists of a 2 1/2" galvanized steel tubing, available in various lengths, a roof flashing kit, weatherhead and bottom conduit adapter, together with various support and guy wire items as required.

Ed

 

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Ed,

No kits here, but Items similar to 1, 3, 8, 11, (bolt & Lag versions) and 14B are commonly used. 14A not so much, Conduit threaded directly into Hub (14B) is preferrable way to go, but it's sometimes an easy way out on retrofits.

Bill

 

[iwire]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

What is 14A, some sort of swivel?

I have only built one mast that I can remember and I used 4" RMC (400 amp 3Ph) on strut no roof penetration, it was a commercial job with no roof overhang

 

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Bob,

There's a threaded connection on the bottom and a slip-on at the top. They come in different sizes and the one's that I've seen can adapt a 2-1/2 Rigid (with or without threads) down to a 1-1/4 hub, or any size in between.

Bill

 

[Ed MacLaren]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Bob, 14a is a conduit adaptor. It fits into the bottom of the mast tubing, fastens with a setscrew, and has a standard pipe thread on the bottom. It even has the offset built in so the threaded end lines up with the meter-can hub.

The mast tubing (the ones we use) isn't conduit, it's a standard structural steel tubing, easily cut to desired length.

You can put up a service in a few hours with this stuff. They are used here on most 1 storey buildings.

Ed

[ January 05, 2004, 07:11 PM: Message edited by: Ed MacLaren ]

 

[nift21]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

what's 14a called in that diagram??

lets say i want to use 2 ft of 2 1/2 and then a 10 ft length.

the little two foot piece would be on the bottom, and if i cut it there would be no threads, how does this work??....Job starts tomorrow morning so keep the advice coming!

thanks Guys =)

 

[wade1]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Could you use a threadless connector if you don't have access to a pipe threader?

 

[jimwalker]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Will it be water tight ?
Don't forget the cam.
And i do think i would run this past poco and AHJ before i did it.
I from reading the code see 8 feet. no idea where that 5 ft rule comes from

 

[rrrusty]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

How about some all thread and a turn buckle with an angle bracket; Use a 3 1/2"x3/8 Lag to go into the joist and use the left handed part of the turn buckle to go thru the 2nd hole of the angle bracket(it has a hole in each leg)Run the all thread into the right handed part of the turn buckle, use a "Mini" Grc clamp to secure to the mast with a couple of Nylon Lock Nuts with jam nuts to hold into place; If worried about leaks use a piece or rubber between the roof and the angle bracket to seal; Length of AT and how many is up to you

 

[Ed MacLaren]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

nift21,

lets say i want to use 2 ft of 2 1/2 and then a 10 ft length.

This is not conduit. Why not buy a 12 ft length instead.

If your supplier carries this product, they will likely have the guy-wire kit as well.

14a is a conduit adaptor - See my post above - Jan 5, 7:08 PM

Ed

 

[iwire]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Ed, our code will not allow the use of steel tubing as a raceway.

Even though for the application we are talking about it would make much more sense to use 12' of tubing with no coupling than a 10' and 2' piece of RMC. :roll:

344.6 Listing Requirements.
RMC, factory elbows and couplings, and associated fittings shall be listed.

 

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Ed,

There is a similar adapter sold here that I haven't been able to find a name or picture for yet. I will look more today.

Bill

 

[bill addiss]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY


No, it's not the prettiest thing in the world, but it sometimes serves a purpose.

[ January 06, 2004, 12:01 PM: Message edited by: bill addiss ]

 

[tshea]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

Hey nift21,
How did the job go? We are all curious. Here in WI the poco provides us with a guide book (first one free, next $5). It spells out the height of the mast, what type of conduit to use-EMT, IMC, GRC, or Al; the height of the mast based on the distantce to the pole, and what height on the riser to guy including nice diagrams.
In most cases we check with POCO before doing one of these in case of changes or other unknown factors. Services all require permits so the AHJ knows what is being done but not necessarily the specifics. Again, it's just a phone call away.
Hope your job went well.

 

[nift21]

Re: QUESTIONS ON A TRICKY SERVICE, JOB SCHEDULED FOR TUESDAY

ED MCLAREN,WHATS NOT CONDUIT?