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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...

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....

Visible Isolation of High Voltage Disconnecting Means

Why is visible isolation required for high voltage circuits? High voltage visible isolation has been required in Canada since the fifties. Visible isolation is the...

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...

Article 705.12(A) — Point of Connection Supply Side Connections

I still remember the day when a fellow inspector tapped me on the shoulder and said: “Be ready to leave in 20 minutes; we’re...

Wiring Requirements in Hazardous Locations

One common way of minimizing possibilities of electrical wiring and equipment becoming an ignition source in hazardous (classified) locations is to locate the equipment...

Electric utility/supply authority requirements in conjunction with electrical work performed in...

The subject of jurisdictional demarcation between electrical design of installations required to be performed in accordance with the CE Code, Part I and work...

PV System and Utility Interconnects

The increase in size of solar photovoltaic (PV) systems in recent years has made it more and more difficult to install the AC output...

Transformer Fire in a Substation

If a fire occurs as a result of a failure in a transformer, then the transformer is nearly always a total write off. However,...

Inspecting Power Generating Substations

I remember many years ago working at a nuclear generating facility and being surprised that there was very little of the NEC being applied...