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Supplementary protector — Is it really a circuit breaker?

Supplementary protectors have been recognised in Canada since the publication of the standard in 1989, CAN/CSA C22.2 No.235 Supplementary Protectors. Twenty-eight years later, misapplication...

100% vs 80%: Choosing the right OCPD solution

We make decisions every day, both personally and professionally, with our checkbook in mind.  When decisions are made to “value engineer” or cost out...

Selective Coordination with Circuit Breakers

Introduction Photo credit: enerprom.si Introduction to Selective Coordination Selective coordination is often referred to simply as coordination. Coordination is defined in NEC® 240.2 as: “The proper...

The Slash-Rated Breaker and Shared Neutral Applications

Think back one or maybe more years ago when you had to assemble that latest purchase in front of the Christmas tree; picture the...

Backfeeding Ground-Fault Circuit Breakers

The wording of the exception may introduce confusion as it states that the ground-fault protection device "shall be identified…for backfeeding,” which implies a specific...

Circuit breakers and old panelboard; will anything work?

Question I have an old panelboard made by a company that was sold and no longer produces panelboards or circuit breakers under their old name....

What Do the Markings on Circuit Breakers Mean?

Have you ever been confused about what the markings on circuit breakers mean? Understanding the markings on electrical equipment is a fundamental need to...

Molded-Case Circuit Breaker – Individual Pole Interrupting Capability

The 2002 National Electrical Code (NEC) has an added notation that can be confusing. The notion is a fine print note (FPN) to 240.85...

A Circuit Breaker or Not a Circuit Breaker…That is the Question

You start your day with your first inspection and upon entering the site the owner indicates, reluctantly, that there is some equipment that is...

Taking the Guesswork out of Selecting and Maintaining Molded Case Circuit...

The National Electrical Manufacturers Association has just what you need to answer your circuitbreaker application and preventive maintenance questions. NEMA publishes two standards that...
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