We have a machine here with a label that says 220 Volts and 139.9 FLA. The largest motor is 30kw, continuous duty. There is one other motor that is really small so probably only adds about 5 amps at the max, not continuous duty. Would 1/0 suffice for the supply conductors? I'm looking at 670.4. Is there somewhere else that i should just take the machine FLA and 125%, which would tell me to use 2/0?
Industrial machinery supply conductors
- Thread starter Deetz
- Start date
- Status
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
If the machine has a label of 139.9 I'd say go with that, it should include all loads within the machine. 125% of that probably is necessary.
iceworm
Curmudgeon still using printed IEEE Color Books
- Location
- North of the 65 parallel
- Occupation
- EE (Field - as little design as possible)
D -
Curiousity Question:
220V and motor rated in "KW". Is this a European machine, possibly 50HZ. I know you didn't ask that. I'm just curious.
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Article 430.24
30kW = roughly 40HP, at 230V that would be 104A in the NEC chart. 104 x 1.25 = 130A, plus all other loads combined to size your conductors. Most likely if that other load is really small, i.e. fractional HP lube pump or something, the 139A was the MCA value already done for you. But it's worth checking to make sure.
.
30kW = roughly 40HP, at 230V that would be 104A in the NEC chart. 104 x 1.25 = 130A, plus all other loads combined to size your conductors. Most likely if that other load is really small, i.e. fractional HP lube pump or something, the 139A was the MCA value already done for you. But it's worth checking to make sure.
.
- Status