Channel
Front illumination
A letter shape or artform fabricated from plastic, metal, or other material recognized as suitable as an enclosure; depending on the face, to be used exposed, as a sign body or as an enclosure.

Reverse
Rear illumination 
A letter shape or artform fabricated from plastic, metal, or other material recognized as suitable as an enclosure; depending on the face, to be used exposed, as a sign body or as an enclosure. 

Skeleton Tubing
Neon tubing that is itself the sign or outline lighting. Skeleton tubing may be either attached to an enclosure, “sign body”, or building components.


Exposed 
Channel letters without face or reverse channel letters with an open back. 
Plastic 
(Sign Body) 

Channel letters or reverse channel letters with plastic (typically acrylic) translucent sign face. The addition of the plastic face creates a sign body. 
Recognized
(Enclosure Rated)

Channel letters or reverse channel letters with recognized component (typically polycarbonate) enclosure rated sign face. Addition of enclosure rated sign face creates a complete enclosure which allows enclosure rated connections. 

 



Remote
Installations with transformers located behind the exterior mounting wall or surface 
Direct
Installations with transformers or power supplies located inside a channel letter, fitted with a suitable sign face. 
Raceway
Installations with transformers or power supplies located within a raceway. 


Wet Location 

A location subject to saturation with water or other liquids (such as vehicle washing areas), or unprotected locations exposed to weather. 

Note: All installations that meet requirements for Wet Locations can be used in Damp or Dry Locations. 

Damp or Dry Location 

DRY: A location not normally subject to dampness or wetness. May be temporarily subject to dampness or wetness, as in the case of a building under construction. 

DAMP: Partially protected locations under canopies, marquees, roofed open porches, and similar locations; as well as interior locations subject to moderate degrees of moisture, such as basements, barns, and cold storage warehouses.
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