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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...

PV Power Plants

Large-scale PV plants have become commonplace in the desert southwest with plants routinely exceeding 100 MW in size. The largest plants in the U.S....

The 2007 NESC – Part 3

This article is a continuation of what I see as significant changes that are coming in the 2007 revision of the National Electrical Safety...

Transformer conductors and overcurrent protection

This article will focus on overcurrent protection and conductor sizing for low-voltage transformers. As a reminder, low voltage is defined in the Canadian Electrical...

Working in Dangerous Proximity to Overhead High Voltage Lines – OSHA,...

There are two sets of rules for work in proximity of overhead high voltage lines: The rules for qualified persons and the rules for...

The 2002 NESC Strength and Loading $$

The most significant change to the 2002 National Electrical Safety Code (NESC) is in the strength and loading requirements for aerial electric distribution and...

Are There Any Listed Energy Storage Systems

Question The 2017 NEC has a new article on energy storage systems, does UL List these systems? Yes. UL Certifies/Lists energy storage systems for use 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...

The Storage of Hazards

The excess space inside electrical supply stations (substations) is often considered for storage of construction materials. The National Electrical Safety Code® (NESC®) in Rule 110B2...

A Closer Inspection of the Growing Outdoor Power Trend

One of the biggest trends in the facility management industry is the desire for permanent power in outdoor spaces. People have smartphones on them at...