formula

[jfplaniczka]

I would like to know the formula to figure out wire size and overcurrent size for a particular situation. 460 volt 3 phase bus duct feeding a 64 kva piece of machinery.

 

[tom baker]

Re: formula

Do you have a code book?
If its a motor follow the rules for ampacity of conductors in Art 430. Conductors are sized per Table 310.16.
Or are you asking how to convert 64 kva into a ampere load?

 

[lady sparks lover]

Re: formula

Originally posted by jfplaniczka:
I would like to know the formula to figure out wire size and overcurrent size for a particular situation. 460 volt 3 phase bus duct feeding a 64 kva piece of machinery.

I would be happy to help you for a fee of 110 dollars an hour for the calcs...

just kidding...

Lady

 

[ctrider]

Re: formula

As already asked, what specifically is the equipment? It should have a nameplate & on that nameplate is an ampere rating. According to code this information is what you need to use.

[ January 21, 2004, 06:35 PM: Message edited by: ctrider ]