Exsisting 3phase 100amp 240v delta system.
Upgrade 3phase 150amp 240v delta system.
This service is underground and I have already requested a work order with the Utility Company. It appears the exsisting underground feeders are of a sufficient size and
will confirm with them.
The exsisting panel is rated for 150amps. There are:
2 pole 240v arc welder 30amp
3 phase 240v air compressor 50amp
3 phase 240v sub panel 60amp
The equipment from the
subpanel is feeding a
paint booth and uses
approximately 23amps
Interviewing the owner of the Auto Body Shop I was able to determine the typical use of the equipment on this service.
I used an amp probe to take readings at different times during the day to find out what the actual load was on the service. The load averaged between 20 and 60 amps evenly distributed between phases.
The new equipment will be 3 phase 230v 50amp breaker.
Would anyone be able to give me some feed back on whether or not I am correct on thinking this upgrade will handle the exsisting load and the new load. I am assuming 60amp exsisting plus 50amp max on new for a total of 110amps on the 150 amp service. 80% being 120amps.
Thanks for any help in advance.
