UPS power to a flush-mounted structured wiring enclosure

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jstjohnz

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I need to provide 120V to a flush-mounted wiring enclosure inside of a wire closet that will contain some 120VAC powered equipment for satellite/catv distribution. The enclosure has provisions for mounting 2 duplex receptacles to the bottom of the enclosure.

The catch is that it needs to be powered from a UPS. If it was a surface mounted enclosure I would just run SO cord from the receptacle box on the enclosure to a receptacle on the UPS. But, since it's a flush mount enclosure the box for the receptacles is inside of a wall.

So, it looks like I will run NM in the wall from the enclosure to a junction box near the UPS, then transition to SO to go to the UPS. Can I just bring SO out of a cable gland on the wall plate of the junction box, or do I need a female inlet?

Is there an easier/better method? Seems like overkill to run 6-8 feet.
 
I'm not aware of a code compliant method to make a field assembled extension cord to be permanently installed, which is essentially what you want to do.

BTW, don't repost in multiple forums, it becomes a mess.
 
ron said:
I'm not aware of a code compliant method to make a field assembled extension cord to be permanently installed, which is essentially what you want to do.
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You don't. The Op is on the right track with the NM. I know they (off hand I don't remember who*) make 5-15 male "inlet plugs" that mount in a box like a receptacle. The prongs are recessed kind of like the old clock receptacles. So NM from a handy box in the enclosure to the inlet box. After that you make up a short male/female extension cord to go from from the UPS to the inlet on the wall.

*I would check the AV suppliers as that is a common problem with powering AV equipment like powered speakers and projectors that are powered/switched by other equipment.

-Hal
 
jstjohnz said:
So, it looks like I will run NM in the wall from the enclosure to a junction box near the UPS, then transition to SO to go to the UPS. Can I just bring SO out of a cable gland on the wall plate of the junction box, or do I need a female inlet?

Is there an easier/better method? Seems like overkill to run 6-8 feet.
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You need an inlet. There is a company called Power Bridge that makes a UL listed "extension cord" kit to plug equipment into a remote ups.
 
hbiss said:
You don't. The Op is on the right track with the NM. I know they (off hand I don't remember who*) make 5-15 male "inlet plugs" that mount in a box like a receptacle. The prongs are recessed kind of like the old clock receptacles. So NM from a handy box in the enclosure to the inlet box. After that you make up a short male/female extension cord to go from from the UPS to the inlet on the wall.

*I would check the AV suppliers as that is a common problem with powering AV equipment like powered speakers and projectors that are powered/switched by other equipment.

-Hal
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There was a provision added to the 2011 or 2104 code to allow this. It used to be a violation to use SO from UPS to the inlet in the wall, and then to the receptacle via NM. The violation was using SO as part of the permanent wiring.
 
What brand cabinet?

Most make an extension ring for the cabinet that will allow you to install a UPS in the enclosure.

P&S requires it for warranty claims in intuity systems.


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jstjohnz said:
I need to provide 120V to a flush-mounted wiring enclosure inside of a wire closet that will contain some 120VAC powered equipment for satellite/catv distribution. The enclosure has provisions for mounting 2 duplex receptacles to the bottom of the enclosure.

The catch is that it needs to be powered from a UPS. If it was a surface mounted enclosure I would just run SO cord from the receptacle box on the enclosure to a receptacle on the UPS. But, since it's a flush mount enclosure the box for the receptacles is inside of a wall.

So, it looks like I will run NM in the wall from the enclosure to a junction box near the UPS, then transition to SO to go to the UPS. Can I just bring SO out of a cable gland on the wall plate of the junction box, or do I need a female inlet?

Is there an easier/better method? Seems like overkill to run 6-8 feet.
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Food for thought, what if the inspector feels using a portable UPS to supply permanent building wiring is outside the listing of the UPS?

I am not saying they should, just that IMO they could.
 
iwire said:
Food for thought, what if the inspector feels using a portable UPS to supply permanent building wiring is outside the listing of the UPS?

I am not saying they should, just that IMO they could.
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Yup, that thought has crossed my mind.
 
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