Certification

UL 48 lists the finished sign, UL 879 its components, UL 879A retrofit kits. What NEC Article 600 asks of LED neon signs and what to ask the neon supplier.

Stair lighting code for LED strip: 10 fc on stairs in use, the emergency 0.1/1 fc rules, controls, glare-free nosing placement, theaters and UL 1994 marking.

LED strip in a shower niche: the NEC 410.10(D) zone, wet marking vs IP67, the 30 V dc wet-contact limit, where GFCI comes from and where the driver goes.

Does cutting LED strip void its UL listing? What sources say on marked cut points, soldering, driver swaps and retrofits, and what to keep on file for the AHJ.

What an LM-79 report proves for LED strip, how to check it against the model you buy, and why LM-80 and TM-21 answer a different question about aging.

Flexible LED strip is usually not a DLC category. See what the DLC lists, how to sort a rebate project, what to ask the utility and the private-label route.

A framework for LED strip compliance beyond UL: FCC Part 15 for drivers and controllers, Prop 65 for cable and components, labeling and the document pack.

Mixing LED strip, driver and controller brands works when voltage, control protocol and listings match. What breaks, what the inspector asks and a quick table.

LED strip counts toward lighting power density. How codes count tape watts, which allowance it uses, the controls it needs and what the reviewer wants to see.

Read the file number and model on the label, search UL Product iQ or the Intertek directory, and match holder, model, category and status for strip and driver.

IP68 is an ingress test, not a pool listing. What LED strip in pools and fountains needs: an underwater listing, a compliant supply, sealed joints and distance.

No NEC section we found requires a metal channel under LED tape. See what the instructions, heat and adhesive require, and how to answer an inspector who asks.