High-Efficiency Transformers and the Electrical Distribution System

The transformer is one of the most basic of electrical equipment found in a power distribution system, and just when you thought that a...

Hazardous Location? Confusion still exists

Two years ago this journal published my article titled, “Hazardous Location: How Do We Know That It Actually Is?” and I received a number...

Disconnecting Means for Generators: Are we consistent on this subject?

There is no doubt that in electrical installations disconnecting means and overcurrent protective devices are required for electrical equipment and for ungrounded conductors. This...

Electrical Power Quality and Harmonic Concerns

The Problem of Harmonics Harmonics are generated by nonlinear components in electrical systems, which distort the sine wave. Increasing usage of power electronics causes a...

O Disconnect, Disconnect, wherefore art thou Disconnect?

Somewhat like Juliette looking for Romeo, PV installers and a few inspectors have trouble looking for, finding, and interpreting the numerous disconnect requirements in...

UL Question Corner: Line Side Power Distribution Blocks

Question I seem to recall that UL does not certify (List) power distribution blocks for use on the line side of a service. Is that...

Recommended Surge Protection for Emergency Power Panels

As emergency power systems increase in complexity, increased immunity to power surges is essential in maintaining electrical sustainability. Surge protective devices (SPDs) are a...

Energy Management Safety Implications

Energy use reduction and management are common in electrical systems of today. Automatic or even manual control of utilization equipment, managed energy storage, and...

Electrical Safety for Motor Fuel Dispensing Facilities

Perhaps the number one rule in advertising is for your advertisement to be seen. Thus, it is no surprise that electronic advertisements are placed...

Evolution of the High Voltage Station

The current Canadian Electrical Code Part I (CE Code) has special terminology for a high voltage station that states, “Station – an assemblage of...