We would like to install a fused disconnect between the motor controller and the transformer (4160V side) with an emergency shut off switch. The problem we are having is proving that this is a necessary item as required by the code. Our GM thinks the fuses on the high line pole on the 24.9kV...
Can fuses on a 24.9kV line satisfy the requirements of the NEC 230.204 code? Here is the setup:
250 Hp 3P/60H/4160V motor with motor controller and a 4160V/24.9kV 300KVA padmount transformer
Thanks in advance for any help on this.
Sherry
Thank you PWR and RalphChristie for your help. You have been helpful to our site wide power study.
Davidbeach - No help.
Thanks again and if you or anyone else has information that can help, it would be greatly appreciated.
Sherry :-)
We have a GE M-90 Register being used on a VM-65-S meter to monitor power usage in our Lithium Carbonate mill (4160V power and it is transformed down to 480V for the meter/register). Our billing personnel are taking the numbers from this meter and multiplying them by 288 to get a cumulative Kwh...
We have a GE M-90 Register being used on a VM-65-S meter to monitor power usage in our Lithium Carbonate mill (4160V power and it is transformed down to 480V for the meter/register). Our billing personnel are taking the numbers from this meter and multiplying them by 288 to get a cumulative Kwh...
How do I calculate the cost of power ($0.085/kWh) for a 600hp, 3-phase, 2300V, 1775rpm, 60hz, 81.6% efficient, 95%pf motor? I am also trying to calculate the cost of power for a 600hp, 3-phase, 460V, 1775rpm, 60hz, 81.8% efficient, 95%pf motor. I have calculated the amps as 144.7 and 723.3...
