tricard
Electrical
- Jul 9, 2008
- 38
Hello all,
I am wondering if there are any advantages to using a 4-pole contactor when switching 3 single phase loads that operate phase to ground. I have a lighting circuit branch that is fed by a contactor. The lights are connected phase to ground on a 600V three phase system (e.g. lights operate 347V). From each contactor is a 5/C #10 cable, where three of the conductors feed the lights at 347V (phase to ground, one for each phase), one conductor is the neutral return and one conductor is the bonding wire. I know that a circuit like this would typically just be connected to a 3-pole contactor and the neutral would be brought back to a neutral bus in the panel, however would there be an increase in safety or any advantage if the neutral was completely switched off with the phase circuits via a 4-pole contactor instead of a 3-pole?
Thanks for the help
I am wondering if there are any advantages to using a 4-pole contactor when switching 3 single phase loads that operate phase to ground. I have a lighting circuit branch that is fed by a contactor. The lights are connected phase to ground on a 600V three phase system (e.g. lights operate 347V). From each contactor is a 5/C #10 cable, where three of the conductors feed the lights at 347V (phase to ground, one for each phase), one conductor is the neutral return and one conductor is the bonding wire. I know that a circuit like this would typically just be connected to a 3-pole contactor and the neutral would be brought back to a neutral bus in the panel, however would there be an increase in safety or any advantage if the neutral was completely switched off with the phase circuits via a 4-pole contactor instead of a 3-pole?
Thanks for the help