Columns

We hear only what we understand

A Critical Look at Load Side Utility-Interactive PV Inverter Connections 690.64(B) / 705.12(D)

Has UL investigated the effects of spray-on foam insulation on Type NM cable jackets or individual conductor insulation?

When is the 2011 UL White Book available, and what is new for 2011?

Risk comes from not knowing what you’re doing

What’s Wrong with Rule 14-100?

Safety and performance of Codes

Changes and Challenges

Is there anywhere I can get a repository of UL Question Corner columns in one place and organized by topic?

Consistency in requirements for electrically connected life safety systems in different Codes and Standards