Risk is a part of life, but it’s more immediate and apparent in some lives—including those spent in the construction industry. Every construction project starts with some uncertainties. Will anything prevent us from accomplishing what we promised? Will we make a reasonable profit?
One of the first steps in performing an arc flash calculation study is to request short-circuit data from the electric utility company. This kind of request is pretty routine, and utilities have been providing this type of data for short-circuit studies for years.
As the weather warms up, workers face many potential hazards, not all of which are directly work/task-related. In addition to traditional safety concerns on the job site, nature throws in hazards that endanger our employees.
Most of us take our hands for granted; we assume they’ll always be there and will function correctly whenever we need them. Although computerized technology rules much of our everyday life, construction is still a hands-on occupation.
As unpleasant as it is to say, the Occupational Safety and Health Administration (OSHA) contractor-related outlook for 2011 is bleak. This applies to every contractor, whether it is the most safety conscious or greatest of risk-takers.
When selective coordination is critical, e.g., minimizing the extent of an outage, a common design practice is to use a main circuit breaker without an instantaneous tripping function and feeder breakers with one.
Safety training is a fact of life for employers. It is essential for several reasons: the Occupational Safety and Health Administration mandates it, and more importantly, offering safety training is the right thing to do.
Electrical safety is a topic worth discussing repeatedly. Both government and private organizations cover it. The Occupational Safety and Health Administration (OSHA) has developed regulations addressing electrical hazards.
Conducting a fire alarm system acceptance test in front of a fire official can prove daunting, even when the system passes muster. But doing any form of fire alarm system testing without having the proper tools is downright foolish.
A lot can happen in two seconds. What may seem like the blink of an eye can feel like an eternity, especially during an arc flash. When calculating the incident energy as part of an arc flash study, sometimes the IEEE 1584 equations can produce unusually large values.
Every work site has flammable and combustible liquids. A flammable liquid is much more volatile than a combustible one, meaning its vapors or fumes can ignite at temperatures below 100°F and some even lower than 32°F.
There seems to be no end to studies and theories on education and training that focus on methodology and effectiveness. Yet, for the lay person who simply wants the basic questions on safety training answered, they offer much more than is needed.
One sentence in the IEEE 1584 Standard, IEEE Guide for Performing Arc-Flash Hazard Calculations, frequently has people scratching their heads: “Equipment below 240V need not be considered unless it involves at least one 125 kVA or larger low-impedance transformer in its immediate power supply.” Wha