NF Panelboards, E-frame breakers

[jim dungar]

I think we posted the same time, but take the application in post number 16. Just seems like Overkill to use I-line, at least from a size and space perspective.

In the old days, they offered an HCN I-Line panel that was closer in size to NF than to the large I-Line. This was their go to lighting and branch circuit panel before they introduce the NEHB panel and its successor the NF

If they dont still have it, the market didn't warrant making it any more. You can't be everything to everyone.

 

[kwired]

But say I had an application where I needed 12 3 pole 20A 480 straight rated breakers. I would have to use I-line?

With Square D products yes. NF is slash rated only.

 

[kwired]

How often do you find this need on ungrounded or corner grounded 480V systems? As long as the source is 277V to ground you can use NF panel even if you do not pull a neutral.

Ungrounded and corner grounded tend to only supply limited loads in most instances. We even see high leg delta on 480 for irrigation services around here. Typically only see it for under 20kVA where the POCO doesn't want to put three transformers on the pole and they supply it via open delta. There are existing older open delta that were fed by single phase (different phase) from two different directions, but they don't tend to do that anymore unless it is a rather small load being served - like under 20-30 kVA. I know of at least one that is supplying a 100 HP well though, but been there a long time.

 

[norcal]

Understood. I think all of our applications will be solidly grounded 460Y/277 systems. We are still using the iLine full of 400A breakers that will feed down to the NF boards with the 30s.

How can you have 460Y/277? I can see 480Y/277, 460Y/265, but not 460Y/277.

 

[electrofelon]

How can you have 460Y/277? I can see 480Y/277, 460Y/265, but not 460Y/277.

Prolly a typo