210.6(D)

[Gary Sullivan]

What are the applications for 210.6(D) ? I'm running subpanels from a panelboard at 480/277. The owner says they want 480V lighting, I say that section 210.6(C) does NOT apply since it is worded for a single panel board. Earth grounds are isolated as the sub panels are in buildiings some distance away.

With isolated neutrals, section 210.6(D) applies and so a 277V lighting is needed to avoid the height restrictions of a 480V system.

 

[jumper]

What are the applications for 210.6(D) ? I'm running subpanels from a panelboard at 480/277. The owner says they want 480V lighting, I say that section 210.6(C) does NOT apply since it is worded for a single panel board. Earth grounds are isolated as the sub panels are in buildiings some distance away.

With isolated neutrals, section 210.6(D) applies and so a 277V lighting is needed to avoid the height restrictions of a 480V system.

210.6(D) would not apply to panelboards or lighting supplied by a 480Y/277 source, 210.6(C) would. 480V light fixtures would still be 277V to ground, so 210.6(D) height restrictions do not apply.

210.6(D) would apply if you had a 480V delta supply and the voltage to a light fixture was 480V to ground.

 

[tkb]

What are the applications for 210.6(D) ? I'm running subpanels from a panelboard at 480/277. The owner says they want 480V lighting, I say that section 210.6(C) does NOT apply since it is worded for a single panel board. Earth grounds are isolated as the sub panels are in buildiings some distance away.

With isolated neutrals, section 210.6(D) applies and so a 277V lighting is needed to avoid the height restrictions of a 480V system.

Per 210.6(C) you can use 480 volt lighting from your 480/277v system.
210.6(C) states that circuits over 120v between conductors and not more than 277v to ground can supply the lighting if you meet the rest of the requirements.