hennemark
Member
- Location
- Lansing, Michigan, USA
I?m putting in a geothermal system where the power company allows separate metering of the power usage, and a reduced rate for the ?furnace,? blower, well pump, auxiliary resistance heat, and electric water heater.
I?ll need to run about 200 feet of cable from the service drop to the 125 amp breaker box that only powers the above geothermal equipment. The power supply is 240V, single phase, and at full load the system will draw about 96 amps. I plan to use 2/0 aluminum or #1 copper feeders with a #4 aluminum or #6 copper grounding cable attached to grounding rods. All of the equipment from the breaker box is 240V, thus the load is fully balanced. The neutral carries no current, and is only there for ground fault protection.
My question is: since the load is balanced, do I size the neutral the same size as the grounding cable? Where is this addressed in the NEC?
I?ll need to run about 200 feet of cable from the service drop to the 125 amp breaker box that only powers the above geothermal equipment. The power supply is 240V, single phase, and at full load the system will draw about 96 amps. I plan to use 2/0 aluminum or #1 copper feeders with a #4 aluminum or #6 copper grounding cable attached to grounding rods. All of the equipment from the breaker box is 240V, thus the load is fully balanced. The neutral carries no current, and is only there for ground fault protection.
My question is: since the load is balanced, do I size the neutral the same size as the grounding cable? Where is this addressed in the NEC?