I was recently asked this question by a group of electrical engineers in conjunction with the NFPA 20 requirement for an overcurrent device protecting feeder conductors to the fire pump controller from the normal power supply source to carry a fire pump locked rotor current indefinitely.
Since its invention nearly 60 years ago, the GFCI has undergone numerous design iterations and technological advances that have enhanced its personnel protection features.
Two significant code revisions recommended by the Professional Electrical Apparatus Reconditioning League (PEARL) were adopted for inclusion into the latest version of the 2017 NEC.
Section 8 is a general section of the CE Code. It provides the information you need to select the conductor ampacities and equipment ratings for consumer’s services, feeders, and branch circuits.
A transfer switch (automatic or manual) is a key component for switching between the normal and alternate power source.
Section 8 is a general section of the CE Code. It provides the information you need to select the conductor ampacities and equipment ratings for consumer’s services, feeders, and branch circuits
The Code is a comprehensive document. Sometimes it can seem quite daunting to quickly find the information you need. Part 4 provides a guide to help users find their way through this critical document.
UL Certifies/Lists energy storage systems for use in accordance with new Article 706 in the 2017 NEC. UL Certifies/Lists these systems under the product category Energy Storage Systems and Equipment (FTBW).
The Code is a comprehensive document. Sometimes it can seem quite daunting to quickly find the information you need. This series of articles provides a guide to help users find their way through this critical document.
I’ve got my top picks for this new edition of NFPA-70. I like to think of them as the “Top Ten Electrical Code Changes.” Sure, there are a bunch of changes, but I always feel obligated to pick out the “Top Ten” as I see them