Skokian
Member
- Location
- Skokie, Illinois
A new compressor has a motor with an FLA of 10.5 at 230 Vac single phase. It trips upstream 20 amp time delay plug fuses.
Exception No. 2(b) would allow the time delay fuses to increase from 175% (18.375 amps -> 20 amps) to 225% (23.625 amps).
Exception No. 1 allows up-sizing to the next larger standard fuse. However, Exception No. 2(b) states said fuse "... shall in no case exceed 225 percent ..." of the motor FLA.
Can I up-size to 25 amp time delay fuses or am I still stuck with 20 amp time delay fuses?
This compressor is used with a dry-pipe fire sprinkler system in a church in a large city.
Tx. in advance for any assistance or opinions.
Exception No. 2(b) would allow the time delay fuses to increase from 175% (18.375 amps -> 20 amps) to 225% (23.625 amps).
Exception No. 1 allows up-sizing to the next larger standard fuse. However, Exception No. 2(b) states said fuse "... shall in no case exceed 225 percent ..." of the motor FLA.
Can I up-size to 25 amp time delay fuses or am I still stuck with 20 amp time delay fuses?
This compressor is used with a dry-pipe fire sprinkler system in a church in a large city.
Tx. in advance for any assistance or opinions.