Show-window lighting load measurement can be expressed as which of the following?

• A. 200 volt-amperes/linear foot
• B. Horizontally along all sides of the window
• C. Horizontally along the base of the window
• D. Either A or B

Answer: (A)

Show-window lighting load is estimated using a fixed load density per unit length of the window opening. The standard rule is 200 volt-amperes per linear foot of window frontage. This means you multiply the window width (in feet) by 200 VA to obtain the assumed load, independent of fixture count or arrangement. It keeps calculations simple and scalable with how wide the display is. Describing the load as along a path on the sides or along the base would focus on where the load is measured rather than how much load to assign, which isn’t how this measurement is defined. Therefore, the expression is 200 VA per linear foot of window frontage.