Today I wired up an industrial mixer. It was 1.5 hp, 3 phase, 208v. I used an Allen-Bradley size 0 starter with a 120v coil. I pulled a neutral along with the circuit to use for my control circuit. For my control wiring I connected one wire to the line side of the starter, hit the limit switches (so the mixer won't start without the kettle being in place), hit the stop/start, and then came back and connected to the holding contact, o/l relay, etc. and then to the coil. I landed the neutral directly on the other side of the coil. The in-house maintenance man at the facility suggested I use a 208 to 120 transformer to originate my control circuit. When I asked him why he said "That's the way it's done". He was so convincing, I decided to go ahead and do it my way. But of course I'm wondering, is there any reason to do it his way? What do you guys think? Also, should I have fused the control wiring? There is no load on it other than the coil (no indicator lights or buzzers, etc.). I installed 10amp FRN-R fuses upstream of the starter. The nameplate rating of the mixer is 5.8 amps at 208v.
Thanks for any input.
John
Thanks for any input.
John