Allowability of Changing Panelboard circuits from 480 to 277 VAC

[petersonra]

And you'd be free to do so, but, who would want to go and do something like that?


JAP>

it is a code legal option. it might even be cost effective.

personally, I like the idea to just use 480V LEDs as another poster suggested.

 

[jap]

it is a code legal option. it might even be cost effective.

personally, I like the idea to just use 480V LEDs as another poster suggested.

Me too.

 

[JFletcher]

you are free to do so for future installs.

btw - it has occurred to me that one could add a small single phase 480-277V xfmr for each circuit and not ground the secondary as it would not be required, so no need to change the wire colors. no idea cost wise how this works out.

what about using a 480V/277V auto xfmr for each lamp? $22ea, tho the 480V LED lights I saw were ~$37 more each than the 277V models.

Maybe not through red clay, but way back when I was an apprentice we pulled out some aluminum THW that was directly buried across a high school football field. It was replaced with one size smaller copper. We dug up the existing conductors at each side line, served the new conductors to the old ones at one side line, and connected the other end to a the winch line of a large wrecker. Worked great and as far as I know the conductors we pulled in some 40 years ago are still in use.

Interesting! Thanks for the story/ideas.

 

[petersonra]

what about using a 480V/277V auto xfmr for each lamp? $22ea, tho the 480V LED lights I saw were ~$37 more each than the 277V models.



Interesting! Thanks for the story/ideas.

would likely need fuses for the transformers that would add cost.

 

[crysmarye]

yes it is true