There has been a substantial controversy raging throughout the electrical industry for a considerable time now, and hopefully, changes made for the 2008 National Electrical Code (NEC) will finally resolve this debate.
Recently, an electrical contractor and his foreman visited my office to talk about electrical equipment installed in hazardous locations, specifically about explosion-proof, intrinsically safe and nonincendive equipment as well as purged and pressurized systems.
Almost every owner or manager of a contracting firm brings up the challenging problem of finding and keeping qualified technicians. Some of the old-timers complain they can’t seem to figure out what motivates the younger technicians entering today’s marketplace.
Protection for transformers rated 600 volts or less is determined by selecting one of three levels of full load current (FLC) found in Table 450.3(B) of the National Electrical Code (NEC). Levels are based on either primary protection only or by providing both primary and secondary protection.
Article 110—Requirements for Electrical Installations; Article 210—Branch Circuits; Article 250—Grounding and Bonding; Article 392—Cable Trays; Article 408—Switchboards and Panelboards; Article 517—Health Care Facilities; Article 680—Swimming Pools, Fountains, and Similar Installations; The 2006 ed
There were 3,688 proposals for changes to the National Electrical Code (NEC) and approximately 2,500 comments processed by National Fire Protection Association staff at NFPA headquarters in Quincy, Mass. The following is part two in a series of significant changes for the 2008 NEC.
There are times when an idea seems to take on a life of its own, and bonding of swimming pool water seems to be one of those. This idea was proposed for the 2005 National Electrical Code (NEC), passed at the proposal stage and was soundly rejected at the comment stage.
Recently, I received a call from an electrician friend who wanted to know how to determine the difference between a raceway, nipple and sleeve, and this individual has been an electrician for 20-plus years.
Article 517 in the National Electrical Code (NEC) applies to electrical construction and installation criteria in healthcare facilities. Part II of Article 517 provides the requirements for wiring and protection in healthcare facilities and is applicable to all patient care areas.
The overcurrent protection (OCP) for Class 2 and 3 circuits is inherent because it is equipped in their power supply. Separate OCP when used for these circuits only applies to the supply side of the power source.
Article 250—Grounding and Bonding; Article 517—Health Care Facilities; Article 680—Swimming Pools, Fountains, and Similar Installations; Article 700—Emergency Systems; Article 702—Optional Standby Systems; Various parts of the 2006 edition of Guide Information for Electrical Equipment (White Book) p