How many NEC violations?

[egurdian3]

Has anyone run into such a situation?
Apartment Bldg. 1000A, 208/120V, 3Phase, 4w fed by 480/277V, 3Phase, 4w and it has been in service since 1979, going on 40.

 

[jumper]

Okay, I am a bit slow.

Can you expand/elaborate the situation a little more?

Right now I am imagining 208/120V switchgear/MDP fed by 480/277V by the scant description.

 

[egurdian3]

Okay, I am a bit slow.

Can you expand/elaborate the situation a little more?

Right now I am imagining 208/120V switchgear/MDP fed by 480/277V by the scant description.

Jumper, It is that startling, ITE-Gould Switchboard, Type CDP, Rated:1000A, 208/120V, 3Phase MDP, on the 10th floor, feeds a 75kVA Xfmr for receptacle loads, among other loads. Fed with a minimum 800A, 480/277V, 3Phase, 4wire Feeder from the Main Distribution Switch Board in the Basement. I did not open the panel to verify feeder size.

 

[petersonra]

Okay, I am a bit slow.

Can you expand/elaborate the situation a little more?

Right now I am imagining 208/120V switchgear/MDP fed by 480/277V by the scant description.

I would say the only violation is using gear not rated for the actual voltage (unless you are leaving out information), if the presumption by this poster is correct.

Incidentally, in a lot of cases I am told that especially older switchgear that has a lower voltage rating on it is actually the same gear as the 480V stuff. maybe the wrong nameplate was put on it by mistake.

 

[egurdian3]

I would say the only violation is using gear not rated for the actual voltage (unless you are leaving out information), if the presumption by this poster is correct.

Incidentally, in a lot of cases I am told that especially older switchgear that has a lower voltage rating on it is actually the same gear as the 480V stuff. maybe the wrong nameplate was put on it by mistake.

Ok, thanks.

 

[Jraef]

I would say the only violation is using gear not rated for the actual voltage (unless you are leaving out information), if the presumption by this poster is correct.

Incidentally, in a lot of cases I am told that especially older switchgear that has a lower voltage rating on it is actually the same gear as the 480V stuff. maybe the wrong nameplate was put on it by mistake.

That is usually the case for the PANEL, but it's often the BREAKER ratings that are different. The old ITE CDP panels themselves were all made as 600V max panels. But if, when it was originally purchased, the panel was used for 240V and the breakers were 240V max, the label on the panel would say 240V. If so, technically you can't connect 480V to it unless maybe you can convince an AHJ to buy off on the fact that all of the breakers have been replaced with 480V versions.

Good luck with that...