Fish On
Hot Rolled
- Joined
- Feb 23, 2014
- Location
- Foley, Alabama
I've got an American Rotary ADX-20 (digital series 20 hp idler, rated to start 10 hp). It's fed from a 70 amp single phase breaker, and 4 gauge wire, per AR's spec sheet. No issues there.
For awhile,it's just been powering a CNC press brake with a 7.5 hp motor, 20.2 amp nameplate. Knowing that I would later add additional machines, I wired the brake with a 60 amp panel mount breaker and 6 AWG wire, so that I could later run a 3 phase subpanel off that breaker/wire, then run branch circuits to the machines.
That time has come.
I've since acquired an old Niagara flywheel mechanical shear with a 5 hp motor (15 amp nameplate rating). I've had it temporarily wired into the phase converter for a short time, and it's a hard starting SOB. Despite being a 5 hp motor on a 20 hp idler, it actually triggers the start light and you can hear the start capacitor in the panel engage when starting it.
Also just purchased a Geka ironworker with a 7.5 hp motor, nameplate rating of 20.3 amps.
I started to order 30 amp breakers and 10 gauge wire for the two 7.5 hp machines, but given that they are hydraulic loads, I'm not sure if that's adequate for starting.
Likewise, the flywheel load on the 5 hp shear seems like a 20 amp/12 gauge might not be happy.
Can anyone give an idea of how much I should upsize these branch circuits?
For awhile,it's just been powering a CNC press brake with a 7.5 hp motor, 20.2 amp nameplate. Knowing that I would later add additional machines, I wired the brake with a 60 amp panel mount breaker and 6 AWG wire, so that I could later run a 3 phase subpanel off that breaker/wire, then run branch circuits to the machines.
That time has come.
I've since acquired an old Niagara flywheel mechanical shear with a 5 hp motor (15 amp nameplate rating). I've had it temporarily wired into the phase converter for a short time, and it's a hard starting SOB. Despite being a 5 hp motor on a 20 hp idler, it actually triggers the start light and you can hear the start capacitor in the panel engage when starting it.
Also just purchased a Geka ironworker with a 7.5 hp motor, nameplate rating of 20.3 amps.
I started to order 30 amp breakers and 10 gauge wire for the two 7.5 hp machines, but given that they are hydraulic loads, I'm not sure if that's adequate for starting.
Likewise, the flywheel load on the 5 hp shear seems like a 20 amp/12 gauge might not be happy.
Can anyone give an idea of how much I should upsize these branch circuits?