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#55765 - 09/06/05 09:15 AM Undergrd pull boxes  
cgw  Offline
Member
Joined: Jul 2004
Posts: 133
Rochester NY
It may depends on the conduit and cable size but:
How far can you go and/or how many 90's before a hand hole/pull box is required for pulling wire?
(3)350kcmil for an underground service lateral from a pole to a meter on the side of a building.


Work Gear for Electricians and the Trades

#55766 - 09/06/05 12:16 PM Re: Undergrd pull boxes  
GovtVoltage  Offline
Member
Joined: Apr 2003
Posts: 20
Sudbury,MA
352.26 Bends-Number in One Run. There shall not be more than 4 quarter bends, 360 total between pull points.

That is for RNC.........



[This message has been edited by GovtVoltage (edited 09-06-2005).]


#55767 - 09/06/05 02:18 PM Re: Undergrd pull boxes  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
The NEC does not limit the distance between pull points.

The only NEC limitation is the 360 degrees of bend.

After that common sense needs to be applied, how far can you pull with out damaging the insulation on the conductor.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#55768 - 09/06/05 05:26 PM Re: Undergrd pull boxes  
VAElec  Offline
Member
Joined: Jul 2005
Posts: 49
Sterling, Virginia, US
As a general rule, I agree with iwire, common sense. [Linked Image] Now I thought that I had read that you can run a max of 600' underground between manhole/handhole, but I am starting to think that is a local PoCo regulation, bacuase I can't find it again in the NEC...

The only other limitation I can think besides conductor damage is the pulling method. If you have a 240' fishtape in a 250' run...

I try not to rely on breaking the run at a coupling to pull in a rope of string, it's just not fun! Easier (I think) to set a box as you run the conduit.


Pete

#55769 - 09/06/05 06:45 PM Re: Undergrd pull boxes  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,826
Brick, NJ USA
VA:
Our utilities limit the length of UG runs; IF they are pulling primaries, or if the secondaries belong to them.

They also have stringent specs for the hand holes/pull boxes which must be followed. Also, large radius sweeps are utility specs.

Basically, PSE&G says ...'two 90's, and keep the rest straight.
PS: That's not an NEC thing.

John


John

#55770 - 09/06/05 06:56 PM Re: Undergrd pull boxes  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,080
Estero,Fl,usa
The utility (actually their contractor) is the worst about "pullable" laterals around here. I watched them put one together 20' at a time as they pulled the wire in and there is no way it is ever coming out.
They dropped the wire in the trench and threaded the pipe over it, gluing as they went, sand and all.

I was not there in any official capacity so I could just shake my head.


Greg Fretwell

#55771 - 09/06/05 07:36 PM Re: Undergrd pull boxes  
cgw  Offline
Member
Joined: Jul 2004
Posts: 133
Rochester NY
How about 130 feet with four 90's including the 90 at the pole and at the meter?


#55772 - 09/06/05 07:44 PM Re: Undergrd pull boxes  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
130 feet with four 90's sounds doable to me. Just don't plan on doing it by hand.

There are online pulling calculators available, try this one by Gerald Newton
http://www.electrician.com/electa1/ductwirepull.html

Tom


Few things are harder to put up with than the annoyance of a good example.

#55773 - 09/06/05 08:02 PM Re: Undergrd pull boxes  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
cgw I also agree 130' and four 90s is not a problem. I will say that to do that they better be steel sweeps even if the run is PVC. And as Tom said forget about hand pulling it.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#55774 - 09/06/05 08:06 PM Re: Undergrd pull boxes  
VAElec  Offline
Member
Joined: Jul 2005
Posts: 49
Sterling, Virginia, US
We put in a primary once that was (don't yell at me, we followed Dominion VA drawings) 540' of 6" PVC with 5-90's and 1-45. Some of these guys live by rules than make me want to cry! We tied a pull-string to a 20' piece of dead fishtape and pushed through the conduit as we ran it. Made sure to pull the string line back and forth as we lay conduit. If it gets stuck in a glue joint, GOODBYE!

To top it off, we trenched 48" to lay the primary and three weeks later the site guys dropped 36" of fill on top (before the PoCo pulled the feeders)! They got their lines in no problem, and we all wept for joy. [Linked Image]


Pete

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