Rule 4-006 introduced into Table 39 into the 2012 edition of the CE Code has certainly created lots of buzz among the Code users.
Are there “UL Authorized Service People” who can modify UL Listed equipment in the field with no need of a UL field inspection or a field evaluation?
Requirements for audibility of a fire alarm system (FAS) are governed by Article 3.2.4.19. of the National Building Code of Canada (NBCC). So, why is this subject being discussed in a purely electrical publication?
There are two options for certifying engine generator enclosures. In the first option, the generator enclosure or weather housing alone is Classified/Certified. In the second option, a generator and enclosure are Listed/Certified together as a stationary engine generator assembly.
As we prepare for the 2016 Section Meetings, the sections and chapters hosting the meetings have been very busy planning the education programs, networking activities, trade shows, and lining up the most knowledgeable speakers and subject matter experts in the electrical industry.
PV ac system output currents for the larger systems are usually too high for connection on the load side of the service disconnect and must be connected on the supply side of the service disconnect. The NEC allows such connections, but the existing service must be examined carefully to determine where the connection can be made and what type of equipment must be used to make the connection.
This article will explore the need for overcurrent protection for current-carrying tap conductors. CE Code Rule 14-100 requires overcurrent protection where a conductor receives a supply of current and at each point where the size of conductor is decreased.
To play this game, you need a sharp eye, a quick mind and a 2014 National Electrical Code book. (Fill-in-the-blank questions are looking for the exact word(s) used in the NEC.)
My main concern for this particular installation is in reference to 690.64(B)(2). The new 400-amp subpanel is being supplied by 400-amp disconnect which is fed by a line side tap ahead of the service-main disconnect.