panel boards

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mivalentina

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Hi, can NF panel board be used as power distribution for A/C units. I know NF are using for lighting loads. However can I use it instead of I line?.

Is there any restriction?. My new project is considering to add just to A/C units around 70 amp per unit.

thanks for your comments.

In addition I have a circuit breaker 3x70amp, the calculation for cable will be
70 amp x 1.25 or enough cable to support 70 amp?.
 
NF

NF

NF panelboard is a square d panel board 480/277V, the nqod is their 208/120V, the style breakers used is different if I remember correctly the NF accepts style E circuit breakers, and I don't see why not as in the catalog it states that all E breakers are ul listed as HACR circuit breakers as long as the inerruping rating is correct for the application.
 
I think the question is about Square D NF panel. NF is listed as a "Lighting and Appliance Panelboard" in the Square D cataloge. It has max 480/277, 800 Amp max main lugs, or 600 Amp max main breaker and 125A max branch breaker.

I see no reason you could not use it for HVAC units. Why do you spec the type of panel? I just spec the characteristics (voltage, main, branches, rating etc) and let the manufacturer determine the best panel (NF, NQOD, I-line)
 
anelboard

anelboard

mivalentina said:
........
In addition I have a circuit breaker 3x70amp, the calculation for cable will be
70 amp x 1.25 or enough cable to support 70 amp?.
Click to expand...

In regard to the NF panelboard. Likewise, I see no problem, assuming your system is 480/277 and not a 480 delta system.

The last sentence of your post confused me. The air unit should have a minimum circuit amps by which you size your conductor, and an maximum overcurrent protection rating for sizing the OCP. I don't see a situation where you would use a 70 amp braker with conductors at 1.25.....if I understand what you are saying.
 
NF

NF

I don;t have a catalog in front of me, but I believe the board and the associated breakers are rated 480/277. NEC 240.85 prohibits slash rated breakers being used on a delta system.
 
panelboard

panelboard

The E-frame breakers designed for use in the NF panelboard have a maximum phase-to-phase voltage rating of 480V and a phase-to-ground voltage rating of 277VAC, this is indicated on the breaker via the 480/277 rating. as such the panelboard interior also is published with this rating and listed with UL.

If the NF panel is utilized on a 480Y/277 system it can be utilized to feed 3-wire loads only and it is not necessary to pull a neutral to the panelboard as the system is a Y-system. It however cannot be utilized on any delta system with a voltage higher that 277V phase-to-ground. It can be utilized on a 240V Delta system without an issue.

The panelboard interior is actually rated for use on 600Y/347 systems, there is a 600Y/347 version of the E-frame breakers for use on these systems, however they carry a cUL listing for use in the Canadian market.
 
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