Which statement is true about show window lighting load?

Which statement is true about show window lighting load?

• A. It is calculated per linear foot
• B. It is calculated per square foot
• C. It is calculated per square meter
• D. It is a fixed value regardless of length

Answer: (A)

The key idea is that show window lighting load is sized using a per-linear-foot basis because the lighting along a storefront window runs continuously across its length. The total load grows in direct proportion to how long the window is, since fixtures are typically distributed along that length in a continuous strip. So you take the wattage (or VA) per foot of window and multiply by the window’s length to get the total load for that display. This approach makes sense here because the physical arrangement is along a line, not a defined area inside a room. If you tried to use per-square-foot (area) calculations, you’d ignore how many fixtures are actually installed along the window’s length and would either under- or over-size the feeder and service based on the window’s height or other dimensions that don’t drive the lighting load in this case. A fixed value would also be inappropriate because a longer window clearly adds more lighting load. So, the correct concept is that show window lighting load is calculated per linear foot of window.

The key idea is that show window lighting load is sized using a per-linear-foot basis because the lighting along a storefront window runs continuously across its length. The total load grows in direct proportion to how long the window is, since fixtures are typically distributed along that length in a continuous strip. So you take the wattage (or VA) per foot of window and multiply by the window’s length to get the total load for that display.

This approach makes sense here because the physical arrangement is along a line, not a defined area inside a room. If you tried to use per-square-foot (area) calculations, you’d ignore how many fixtures are actually installed along the window’s length and would either under- or over-size the feeder and service based on the window’s height or other dimensions that don’t drive the lighting load in this case. A fixed value would also be inappropriate because a longer window clearly adds more lighting load.

So, the correct concept is that show window lighting load is calculated per linear foot of window.