When determining the spacing of general-use receptacles, what type of elements on exterior walls do not count as wall space?

When determining the spacing of general-use receptacles on exterior walls, sliding panels do not count as wall space because they do not provide a solid vertical surface that can accommodate a receptacle. Per the National Electrical Code (NEC), wall space is defined as the area where a receptacle can be installed, which excludes openings such as windows and doors that do not provide a continuous vertical surface.

Sliding panels, although they may occupy wall space, do not serve as mounting points for receptacles due to their operational design and movement, limiting practical placement of outlets. This is in contrast to elements like windows and doors, which, while they create interruptions in the wall surface, can still be considered when counting wall space. Electrical service panels also represent areas where receptacles cannot be installed directly, but they are specifically addressed differently within the NEC guidelines.

Thus, the determination that sliding panels do not count as wall space is consistent with the NEC's intent to ensure receptacles are placed in areas that provide sufficient access and usability.