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AC Voltage Drop 1
- Thread starter dougjl
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resqcapt19
Electrical
There is an online voltage drop calculator at:
However, because the NEC requires that the motor branch circuit conducotrs have an ampacity of at least 125% of the full load current in Table 430-150, it takes a very long run before the voltage drop becomes a problem. If your motor is 3 phase 460 volt it will have a FLA of 156 amps and require a minimum conductor ampacity of 195. A 3/0 copper with a 156 amp load and 300' run would give you a 1.3% voltage drop.
Don(resqcapt19)
However, because the NEC requires that the motor branch circuit conducotrs have an ampacity of at least 125% of the full load current in Table 430-150, it takes a very long run before the voltage drop becomes a problem. If your motor is 3 phase 460 volt it will have a FLA of 156 amps and require a minimum conductor ampacity of 195. A 3/0 copper with a 156 amp load and 300' run would give you a 1.3% voltage drop.
Don(resqcapt19)
jbartos
Electrical
- Jan 15, 2000
- 6,440
Suggestion: Reference:
1. IEEE Std 141-1993, "IEEE Recommended Practice for Electric Power Distribution for Industrial Plants," e.g. Table 3-12 on page 100
2. Check with larger manufactures of cables and wires, e.g.
1. IEEE Std 141-1993, "IEEE Recommended Practice for Electric Power Distribution for Industrial Plants," e.g. Table 3-12 on page 100
2. Check with larger manufactures of cables and wires, e.g.
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