Show-window lighting minimum feeder load is 200 VA per linear foot.

Show-window lighting minimum feeder load is 200 VA per linear foot.

• A. 100
• B. 150
• C. 200
• D. 250

Answer: (C)

Show-window lighting uses a fixed minimum demand based on the length of the display opening. The NEC sets this minimum at 200 VA for each linear foot of window. This ensures the feeder is sized to handle the typical lighting demands of a display, even if the exact fixture count or wattage isn’t known or if additional lamps are added later. The calculation is straightforward: multiply 200 VA by the length of the window in feet to get the minimum feeder load. For instance, an 8-foot-long show window would require at least 1,600 VA. This is why the per-foot value is 200 VA—the standard used for sizing show-window lighting feeders.

Show-window lighting uses a fixed minimum demand based on the length of the display opening. The NEC sets this minimum at 200 VA for each linear foot of window. This ensures the feeder is sized to handle the typical lighting demands of a display, even if the exact fixture count or wattage isn’t known or if additional lamps are added later. The calculation is straightforward: multiply 200 VA by the length of the window in feet to get the minimum feeder load. For instance, an 8-foot-long show window would require at least 1,600 VA. This is why the per-foot value is 200 VA—the standard used for sizing show-window lighting feeders.