UL 48-2018 pdf free download.Electric Signs.
2.59 SCREW, MACHINE — A constant diameter screw intended for threading into a nut or threaded metal material.
2.60 SCREW, SELF-DRILLING THREAD-CUTTING — A screw that drills its own hole and cuts its threads as it is installed. A common type is called a TEK screw.
2.61 SCREW, SELF-TAPPING — A screw that drills its own pilot hole and forms its own threads.
2.62 SCREW. THREAD-CUTTING — A screw that cuts its own threads in a hole into which it is screwed.
2.63 SCREW, THREAD-FORMING — A screw that forms its own threads by deforming the metal on the edges of a hole into which it is screwed.
2.64 SCREW, WIRE BINDING — A screw used as a post around which a wire is to be wrapped.
2.65 SECTION SIGN — A sign shipped as subassemblies that requires field-wiring between the subassemblies to complete the overall sign.
2.66 SIGN — An electrically operated product that through illumination or mechanical means uses words. symbols, numbers, art, or other advertisement intended to convey information, attracts attention, provides information, or serves as decoration.
2.67 SIGN BODY — Portion of a sign that provides protection from the weather but is not an electrical enclosure.
2.68 SKELETON NEON TUBING — Neon tubing that is itself the sign or outline lighting and not attached to an enclosure or sign body.
2.69 SPLICE — Any point where one wire is connected to another wire. A wire terminating at a pressure wiring terminal or wire binding screw is not considered a splice.
2.70 STATIONARY SIGN — A cord-connected sign that meets all of the following:
a) Intended to be fastened in place or located in a dedicated space;
b) If fastened in place may be removed from its intended mounting with the use of no more than ordinary tools;
C) Does not meet one or more criteria for portable signs (e.g. size and weight limitations); and
d) Does not meet one or more criteria for mobile signs (e.g. provision for movement such as wheels or a trailer).
2.71 STRAIN-RELIEF — Knot, bushing, or equivalent intended to prevent strain from being transmitted through that portion of a wire or cord outside a product to the termination point of the wire or cord inside the product.
2.72 SUBASSEMBLY — Part or segment of a sign or outline lighting system that when assembled with all subassemblies forms a complete unit or product. For example, a sign subassembly is one part of an overall sign that when mechanically and electrically are assembled together form a complete sign.UL 48 pdf download.