In the years working with design engineers for PQ instrumentation, occasionally all of the engineers would gather around a project that had a significant failure and resulted in a smoke cloud wafting up to the lab ceiling. We...

Take care when replacing circuit breakers and fuses in existing services and panelboards at single-, two- and multifamily homes. Older single- and two-family homes with 100A to 200A, 120/240V single-phase services were...

Switching out circuit breakers or fuses in existing homes Care must be taken when replacing circuit breakers and fuses in existing services and panelboards at single- family, two-family and multifamily dwellings. Older single...

Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC) , Jim will help you solve it. Send questions to codefaqs@gmail.com. Answers are based on the 2017...

In February, IEEE Access published an article outlining a study by Jesse Aronstein and David W. Carrier, “Molded Case Circuit Breakers—Some Holes in the Electrical Safety Net.” The study claims testing found certain brands of...