The new Section 210-12 of the 1999 National Electrical Code (NEC) requires arc-fault circuit-interrupter protection for some branch circuits. Does ...
Can a UL Listed product be modified in the field if the manufacturer indicates that the revision is ok and ...
Large signs do. Electric signs so large that shipment in one carton or fully assembled is impractical may be divided ...
Flooding and other natural disasters prompt many questions about water-damaged electrical equipment. Can the equipment be dried out? Are the ...
Question: Letter of findings I recently encountered a lightning protection system on a water treatment plant that was certified by ...
Question: GTO cable Which GTO cable types may be used in electric signs? I am especially interested in the cable ...
Question: For outlet boxes that support ceiling suspended fans, does UL consider out-of-balance fans? Answer: Section 422.18(a) Section 422-18(a) of ...
Question: Exit Signs I’ve noticed that the color, size, and visibility of exit signs varies greatly. Do UL requirements permit ...