How far must at least one receptacle outlet be installed from the top of a show window for 812 linear feet or major fraction thereof?

In the context of the National Electrical Code (NEC) and its application to show windows, the requirement for receptacle outlet placement is primarily focused on safety and accessibility. Specifically, the code mandates that at least one receptacle outlet must be installed within a certain distance from the top of the show window to ensure that it is easily accessible when needed.

The correct distance is 18 inches. This measurement provides a balance between accessibility for power supply while minimizing the risk of water damage or other hazards that can occur from placing electrical outlets too close to the top edge of the window. By having the receptacle at 18 inches, it allows for practical use in a display area without interfering with the aesthetic or structural integrity of the show window.

Choosing this measurement also aligns with typical installations for similar scenarios in commercial settings, further justifying its use. It is designed to ensure that the electrical needs of a show window can be met without compromising safety standards.