Relevance

Due to new technology, social networking and competition, individuals have many options as to where and from whom they can obtain information. Consequently, associations,...

Are there any practical guidelines available to installers and the enforement...

Question A continuous load is defined as "a load where the maximum current is expected to continue for 3 hours or more.” Are there any...

Are Type AC and Type MC cables considered pre-wired raceways?

Question Is the definition of a raceway applicable to Type AC cable and Type MC cable since these wiring methods are factory assembled with insulated...

UL Certifies First Stand-Alone Replacement LED Tube

Question  Does UL List (certify) stand-alone LED (light emitting diode) tubes for direct replacement of fluorescent tubes in fluorescent luminaires? Answer Yes, recently UL has certified (Listed)...

On the performance of arc flash analysis in DC power systems

Direct current (DC) arcing fault incident energy calculations are presented to assess the level of risk involved when working around high current DC apparatus....

LED Lighting for Hazardous Locations

Light-emitting diodes are not a particularly new technology. Affordable LEDs have been available since the late 1960s. From then until now, the technology has...

Introduction to PLCs

The programmable logic controller (PLC) is a microprocessor-based system that accepts input data from switches and sensors, processes that data by making decisions in...

Diversify Your Investment Risk

All investments carry risk. But, as an investor, one of the biggest risks you face is that of not achieving your long-term goals, such...

5 Methods of Protection

All three elements of the fire triangle — oxygen, ignition source, and fuel — must be present simultaneously and in specific quantities for a...

Appreciating Hazardous Areas

It was the turn of the century and after thirteen years working on the utility side of the transformer I took on the role...