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Does this project need a Class 1 Division 2, Listed and...

his question comes up with surprising frequency when dealing with installations covered by the National Electrical Code (NEC). One possible reason for the confusion...

Electrical equipment and wiring in plenums and suspended ceilings

The approach to this subject appears to be inconsistent by many users of the Canadian Electrical Code, Part I (CE Code), including electrical designers,...

Back to Basics — The 480/277 V to 208/120 V Wye...

The most routinely encountered transformer installation is likely the common three-phase 480/277 volts (V) to 208/120 V wye dry-type transformer supplying a panelboard. Many...

Bonding electrical equipment on poles

A five-year-old girl was electrocuted; we don’t need another! Unfortunately, some Code changes are a direct result of a fatality. Canadian Electrical Code Rule 30-1024...

Knowledge-based product selection and enforcement of specifications are essential for long-term...

Understanding the costly effect of corrosion on water/wastewater facilities Billions of dollars from public and private agencies have been invested in water/wastewater infrastructure. Within these important...

How safe is electrical equipment that has been exposed to flood...

We live in uncertain times when it comes to natural disasters. The recent Category 4 and 5 hurricanes that impacted Texas, Florida, and Puerto...

Air-Conditioning Equipment Installations

Recently, while teaching a class on residential electrical requirements, I opened the class up to the participants to decide which subject matter we would...

Reconditioned Electrical Equipment Now Included in the NEC — Revisions underscore...

Two significant code revisions recommended by the Professional Electrical Apparatus Reconditioning League (PEARL) were adopted for inclusion into the latest version of the National...

Service Equipment Labeling [ NEC 2017 100.16(B)] Part 2

Practical Example The following is a real-life example of a church supplied from a 208Y/120 VAC, 300 KVA, 3-phase pad mount utility transformer. The published...

Service Equipment Labeling — NEC 2017 110.16(B)

Prior to the 2002 version of the National Electrical Code® (NEC®), incident energy and arc flash requirements were found in NFPA 70E, “Standard for...
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