Pipe in pull box

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marissa2

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Connecticut
I need some help. Some time ago someone posted a picture of a pull box that had a length of pipe passing through the box unbroken. Some replies said that they have done this to seperate low voltage from the high voltage wires. I was on a walk through inspection for a fire alarm system today and the contractor installed the 120 volt wires in this way to seperate them fron the alarm circuit conductors. The inspector asked where in the NEC does it say you can or cannot do this. I hope someone remembers this and can help with this with any code reference that might answer one way or the other.
Lou
 

This one?

IMG_1494_edited.jpg
 
marissa2 said:
I was on a walk through inspection for a fire alarm system today and the contractor installed the 120 volt wires in this way to seperate them fron the alarm circuit conductors. The inspector asked where in the NEC does it say you can or cannot do this.
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Does this work for you?


760.136 Separation from Electric Light, Power, Class 1, NPLFA, and Medium-Power Network-Powered Broadband Communications Circuit Conductors.

(D) Associated Systems Within Enclosures. Power-limited fire alarm conductors in compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be installed with electric light, power, Class 1, non?power-limited fire alarm, and medium power network-powered broadband communications circuits where they are introduced solely to connect the equipment connected to power-limited fire alarm circuits, and comply with either of the following conditions:
(1) The electric light, power, Class 1, non?power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are routed to maintain a minimum of 6 mm (0.25 in.) separation from the conductors and cables of power-limited fire alarm circuits.
(2) The circuit conductors operate at 150 volts or less to ground and also comply with one of the following:
a. The fire alarm power-limited circuits are installed using Type FPL, FPLR, FPLP, or permitted substitute cables, provided these power-limited cable conductors extending beyond the jacket are separated by a minimum of 6 mm (0.25 in.) or by a nonconductive sleeve or nonconductive barrier from all other conductors.
b. The power-limited fire alarm circuit conductors are installed as non?power-limited circuits in accordance with 760.46.
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chris
Thanks, but I don't think that will help, I havent read the spec sheet for this job but I think it doesn't allow the two circuits in the same enclosuer and the fire alarm circuits are THHN wire run in EMT.
Lou
 
chris kennedy said:
Rick, it appears to me the enclosures in both these pictures are bonded.
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In the wireway picture, the 3/4" raceways are not bonded to the wireway. If the feeder phase conductor in the wireway rubs through into the 3/4" raceway where is the ground path back to the source of the feeder.
 
RUWired said:
In the wireway picture, the 3/4" raceways are not bonded to the wireway. If the feeder phase conductor in the wireway rubs through into the 3/4" raceway where is the ground path back to the source of the feeder.
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I see your point.
 
I would think, if wired correctly, it would be from the box back through the raceways that are connected to the box and which should be connected to the grounding conductor.
Lou
 
realolman
What seems stupid to you, the raceway through the pull box or the lack of bonding. This has been talked about before and it was said by some that they have done it to seperate the different systems. I think myself that there might be a better way, but what I would likt tyo know if someone can help with a code section that can answer the question if it is legal or not.
Lou
 
The raceway through the pull box.

I can't see any reason for the setup 480 sparky posted, and not much more for the larger box... except poor planning.
 
How about this..

(A) Wiring done in this manner shall in the future be done in someone else's facility and for the installation of which shall not be paid by me.

:smile:
 
He was told yesterday that it will be replaced. Also I don't remember what artical but in 314 it states that all raceways will be secured to the box.
Lou
 
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