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Monthly Archives: March 2005

Photovoltaic Power Systems and 2005 NEC

The 2005 NEC has been published and Article 690 has some changes that will benefit the Photovoltaic (PV) Power Industry and electrical inspectors by...

Is it permitted to replace a sign face on a listed sign?

Question: Electric signs Is it permitted to replace a sign face on a listed sign?   Answer This question was addressed in the March/April UL Question Corner column...

Inspection Basics for Electrical Signs and Outline Lighting

When making an inspection on an electric sign or field-installed skeleton tubing installation, where does one begin? Well, there are undoubtedly several answers to...

New Requirements for Selective Coordination

For certain vital circuits, the 2005 NEC requires that all overcurrent protective devices be selectively coordinated with all supply side overcurrent protective devices in...

Risk Management, Measuring Benefit, and Costs of Safety

From a presentation at the Canadian Section meeting. Inspections—Necessity or Burden There is a constant movement towards decreasing the cost of doing business both in the...

Is Electrical Plan Review Really Needed?

This is a question many inspection departments ask as budgets for governmental agencies are scrutinized and cut back. It is the field inspector that...

AHJ’s Wanted

Standards Technical Panels (STPs) are the consensus bodies for ANSI/UL Standards and advisory bodies for UL Standards. The STP process provides input from all...

Emergency Systems and the Witness Test

Emergency systems in buildings or structures can vary in size and complexity. Some basic emergency systems provide illumination of the egress paths through unit...

Basic Electricity – Part 5

Up until now, I have been talking about dc, direct current, in which the current in the circuit travels in one direction. Batteries and...

Electrical Plan Review – Is It Worth the Time and Effort?

At one time or another most electrical plan reviewers have probably asked the question, "Is it worth the time and effort?” Electrical plan review...
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