a0128958
Member
- Location
- Plano, TX, USA
We are replacing 180 quantity 1000W metal halide 480 VAC fixtures at a car dealership,
on a one to one basis using 240W LED 277 VAC fixtures.
Each existing 480 VAC circuit for the existing lighting is two #10 wires plus a #10 ground, using 30 amp 2 pole breakers.
The panel board has a 4-wire 480/277 VAC feed (i.e. with a neutral and a neutral bus). The panel board provides inside lighting circuits too, at 277 VAC using single pole breakers.
The existing ground wire is connected to the existing metal poles at the access hatch, and travels upward to a connection to the existing fixtures.
For the existing outside 480 VAC lighting circuits, the electrician is proposing to change the panelboard wiring in order to change these circuits' voltage to 277 VAC to accommodate the new fixtures. The proposal including appropriate labeling/marking of the wires at the panelboard end and at the pole/fixtures end.
No change is proposed to the actual (#10) wiring or actual (30 Amp 2-pole) circuit breakers.
Is this an NEC compliant change that we can be comfortable with?
Many thanks!
Best regards,
Bill
on a one to one basis using 240W LED 277 VAC fixtures.
Each existing 480 VAC circuit for the existing lighting is two #10 wires plus a #10 ground, using 30 amp 2 pole breakers.
The panel board has a 4-wire 480/277 VAC feed (i.e. with a neutral and a neutral bus). The panel board provides inside lighting circuits too, at 277 VAC using single pole breakers.
The existing ground wire is connected to the existing metal poles at the access hatch, and travels upward to a connection to the existing fixtures.
For the existing outside 480 VAC lighting circuits, the electrician is proposing to change the panelboard wiring in order to change these circuits' voltage to 277 VAC to accommodate the new fixtures. The proposal including appropriate labeling/marking of the wires at the panelboard end and at the pole/fixtures end.
No change is proposed to the actual (#10) wiring or actual (30 Amp 2-pole) circuit breakers.
Is this an NEC compliant change that we can be comfortable with?
Many thanks!
Best regards,
Bill