pull box
- Thread starter snjeza
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Re: pull box
snjeza,
I'm not 100% certian but I think this refers to being able to take the cover off of the j-box without getting knocked off your ladder,in other words, tie wrap or similar method to conductors because of the long 6' span to contain them in the box.
frank
snjeza,
I'm not 100% certian but I think this refers to being able to take the cover off of the j-box without getting knocked off your ladder,in other words, tie wrap or similar method to conductors because of the long 6' span to contain them in the box.
frank
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Re: pull box
We usually mount a piece of strut with angle brackets above the conductors and lash them up with cable ties or 1/4" rope. Also, I have seen pieces of 3/4" or 1" galvanized pipe installed through holes punched in opposite sides of the box with the conductors supported on the pipe.
[ June 07, 2005, 06:19 PM: Message edited by: infinity ]
We usually mount a piece of strut with angle brackets above the conductors and lash them up with cable ties or 1/4" rope. Also, I have seen pieces of 3/4" or 1" galvanized pipe installed through holes punched in opposite sides of the box with the conductors supported on the pipe.
[ June 07, 2005, 06:19 PM: Message edited by: infinity ]
rcwilson
Senior Member
- Location
- Redmond, WA
Re: pull box
Many manholes have cable racks on the walls to hold and lash the cables. Otherwise the cables end up in a bird's nest mess. Typical racks look like wall-hung adjustable shelving except there are no shelves, just the support arms sticking out. I have also seen it done with unistrut framework.
Many manholes have cable racks on the walls to hold and lash the cables. Otherwise the cables end up in a bird's nest mess. Typical racks look like wall-hung adjustable shelving except there are no shelves, just the support arms sticking out. I have also seen it done with unistrut framework.
Re: pull box
The AHJ will give you the approval(or deny approval) on the method you select.
I have gotten approval from my local AHJs using various methods:
- strut
- closed eye bolts
etc...
Whatever means you use, it will generally result in a tie-wrap being used to "rack" the cables.
Here are a few types of racks for MANHOLES...but I suppose - if the box was large enough - these would be acceptable:
~ pictures from www.udevices.com.
The key is "..all conductors shall be cabled or racked up in an approved manner."
The AHJ will give you the approval(or deny approval) on the method you select.
I have gotten approval from my local AHJs using various methods:
- strut
- closed eye bolts
etc...
Whatever means you use, it will generally result in a tie-wrap being used to "rack" the cables.
Here are a few types of racks for MANHOLES...but I suppose - if the box was large enough - these would be acceptable:
mdshunk
Senior Member
- Location
- Right here.
Re: pull box
I've taken the cover off many an old pull box in which 2x4 lumber was wedged in to hold the conductors from popping out. I don't recall if the 2x4 had an Underwriter's stamp or not.
I've taken the cover off many an old pull box in which 2x4 lumber was wedged in to hold the conductors from popping out. I don't recall if the 2x4 had an Underwriter's stamp or not.
Re: pull box
Unistrut is not listed for wire management BUT what I like to use are telephone wire distribution spools. These are plastic white tapered posts that have a screw on the back that you can put onto the backside of a panelboard or pull box. These can be a real lifesaver and problem solver. There is nothing that says that you cannot use Bell System wire management techniques on 480 volts if done right.
One time when I was a plant electrician I changed a circuit breaker in the existing lighting panel without refitting it with telehone wire distribution spools similar to the new panels I had done. A few hours later a pinched 277 volt wire went off like a gunshot. Next day I stuck in 8 telephone wire distribution spools.
The advantage of these is that they come with a screw that will go into a 5/32nd inch hole in most woodwork and some metals. For some metals you need an 11/32nd inch hole. They are tapered so that your cable ties automatically push the firts bundle to the rear and the next bundle on top. If you use the rigyht width cable ties you automatically get wire bundle separation so that you only need to have 2 to 4 wires in each bundle.
Unistrut is not listed for wire management BUT what I like to use are telephone wire distribution spools. These are plastic white tapered posts that have a screw on the back that you can put onto the backside of a panelboard or pull box. These can be a real lifesaver and problem solver. There is nothing that says that you cannot use Bell System wire management techniques on 480 volts if done right.
One time when I was a plant electrician I changed a circuit breaker in the existing lighting panel without refitting it with telehone wire distribution spools similar to the new panels I had done. A few hours later a pinched 277 volt wire went off like a gunshot. Next day I stuck in 8 telephone wire distribution spools.
The advantage of these is that they come with a screw that will go into a 5/32nd inch hole in most woodwork and some metals. For some metals you need an 11/32nd inch hole. They are tapered so that your cable ties automatically push the firts bundle to the rear and the next bundle on top. If you use the rigyht width cable ties you automatically get wire bundle separation so that you only need to have 2 to 4 wires in each bundle.
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