97.6 F
Richardson, TX
Thursday, July 27, 2017

Monthly Archives: May 2011

Changes and Challenges

For nearly a century from about 1897 to 1997, premises wiring systems in residences and commercial buildings have largely been collections of passive conductors,...

Is there anywhere I can get a repository of UL Question Corner columns in...

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

Can a manufacturer add labels to a UL Listed product in the field, even...

Question Can a manufacturer add labels to a UL Listed product in the field, even if the label is not a Listing Mark? Answer No, when you...

A sure way to win…

Technology seems to always start out huge and bulky and becomes smaller, streamlined and faster as it is refined; and because it seems to...

Performance Meter Socket Configurations

Because meter sockets are now being installed on the other side of a customer’s load center, as part of PV installations, it is important...

Basic Electrical Calculations

Electrical calculations generally fall within two categories: dc circuit analysis and ac circuit analysis. In a typical engineering curriculum dc circuit analysis is introduced...

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

In general, electrical designers, contractors and regulators are quite comfortable in applying the CE Code requirements for the electrically connected life safety systems. However, they...

Electrical Equipment Vaults

The Canadian Electrical Code defines a vault as "an isolated enclosure either above or below grade with fire-resisting walls, ceilings and floors for the...

“Hazardous Locations” Not Confined to Article 500 Installations

If you have been an inspector for any length of time, you already know that "hazardous locations” often exist in other than Article 500...

A Counterfeit Challenge

Our industry is experiencing a challenge that jeopardizes safety: growth of counterfeit products. The act of counterfeiting is not new to our society and...
- Advertisement -

MOST POPULAR

FLASHBACKS