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Stray voltage -- Catching what we cannot see IAEI Magazine Share     In this article, Jonathan Cadd takes a look at some of the effects of stray voltage and how we can try to mitigate those effects through a good understanding of the many sources of stray voltage and of how those voltages interact, along with the different degrees of sensitivity of not only animals but also humans to the flow of electrical current. We need to continue to apply sound electrical principles, provide quality code-compliant installations, and study and monitor the situation in an attempt to stay ahead of the curve so that future operations can learn from our experiences and continue down the path towards, perhaps one day, the complete capture and removal of stray voltages. More
Maryland adopts current editions of NFPA codes Fire Engineering Share
Maryland is keeping its codes current with the implementation of the 2009 editions of National Fire Protection Association (NFPA) Standard 101, Life Safety Code and NFPA 1, Fire Code, and the 2008 edition of NFPA 70, National Electrical Code. The state has also brought several other NFPA codes and standards up to date with the most recent editions available. All adoptions became effective as of January 1, 2010. “Maryland ’s implementation of the latest editions of NFPA 1, NFPA 101 and several other documents provides us with the tools necessary to continue providing the highest level of protection for the people of our state,” said William E. Barnard, Maryland state fire marshal. More Managing your cable infrastructure Buildings via Interiors and Sources Share
Because your building’s cabling and wiring lie quietly out of sight, they should not be out of mind. Your cable infrastructure adds value for tenants and occupants, and, like all building systems, it requires ongoing attention and management, from installation to removal, disposal, and recycling of cables. Cable that is rated but unused may also require removal. Due to fire safety concerns, since 2002 the National Electrical Code (NEC) has called for removal of abandoned cable, which is defined as any cable that is not terminated at both ends at equipment or a connector, and that is not tagged for future use. The 2008 edition of the NEC clarifies that audio cable is included in the “installed supply circuits and interconnecting cables” to which the removal requirements apply, says Mark Earley, NFPA chief electrical engineer. More
Australian taxpayers face $100m billion to fix insulation mess The Sydney Morning Herald Share
Taxpayers will pay up to $100 million to remove foil insulation or install electrical safety switches in 50,000 homes in a bid to fix the government's suspended insulation scheme. The Assistant Climate Change Minister, Greg Combet, said yesterday removing insulation or installing the switches were now the only ways to ensure safety in homes fitted with foil insulation under the rebate scheme. The government had promised safety checks for the 50,000 homes to test for ceilings live with electricity because of poor installation of foil insulation, at a cost of $19 million. More The NEC and commercial loads EC&M Share
The electrical load requirements for commercial installations result in a great deal of diversity in usage. In other words, while some types of equipment and electrical loads are in use for extended periods, others are only used occasionally or for short periods of time. In addition, there are often two different types of electrical loads on the same service or feeder that will not be brought into service simultaneously by their very nature, such as heating and air conditioning. For this reason, we apply demand factors when calculating service and feeder loads. Different sets of demand factors apply for different types of electrical loads -- and even for different types of commercial buildings. More
Ensuring long life for electrical equipment Plant Engineering Share
A key action to help ensure the reliability of your electrical system is conducting appropriate grounding. Resistance grounding systems have many advantages over solidly grounded systems including arc-flash hazard reduction, limiting mechanical and thermal damage associated with faults, and controlling transient overvoltages. High resistance grounding systems may also be employed to maintain service continuity and assist with locating the source of a fault. Generally, there are two types of resistors used to tie an electrical system's neutral to ground: low resistance and high resistance. More Can you fit a wind turbine in a housing estate? BBC News Share
How many people are actually going to be able to install renewable energy-generating technology in their homes? That is the burning question which goes unanswered in the U.K. government's strategy document called "Warm Homes, Greener Homes", which outlines how it plans to cut carbon emissions from homes by 29 percent by 2020. The plan includes helping as many households as possible install loft and cavity wall insulation within the next five years, and fitting seven million homes with solid wall insulation or renewable energy-generating technology such as solar panels or wind turbines by 2020. More
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