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The arc flash task tables were introduced in the 2000 edition of NFPA 70E(1). They have remained basically unchanged since then. The 2015 edition of NFPA 70E(2) presents arc flash task tables that follow a “clean sheet” approach and do not resemble the previous edition's tables at all. This paper covers the new Table Method in detail, as well as some of the thought process behind it.
Electrical power systems maintenance is recognized by NFPA 70E and NFPA 70B as critical to being able to work safely on or near electrical systems and equipment. Even though many upper-level managers think of maintenance as strictly an overhead function, the costs involved with a lack of maintenance can far exceed the outlay required to maintain power systems properly.
This paper reviews some of the more common electrical safety myths and misconceptions field electrical workers often have. Many of these misconceptions continue in spite of training and education. Some are handed down from worker to worker, similar to tribal knowledge. The real danger from these misconceptions is that they impede the truth and cause electrical workers to misjudge hazards and risks.
This paper reviews factors that should be considered when determining maintenance intervals for overcurrent protective devices and switchgear. Performing maintenance on a regularly scheduled basis is good, but how do you determine those intervals? This paper provides some guidance on that question.
This paper reviews factors that should be considered when determining maintenance intervals for overcurrent protective devices and switchgear. Performing maintenance on a regularly scheduled basis is good, but how do you determine those intervals? This paper provides some guidance on that question.
This paper looks at the most common issues causing circuit breaker malfunctions. Power circuit breakers protect electrical power systems from damage and people from injury or death if a fault were to occur during maintenance or operation of the system. If the circuit breakers are not maintained they cannot be depended upon to function in accordance with the manufacturer's specifications. This paper...
Titan Pulse Sciences Division (Titan) has developed and extensively tested a scaled down version of the rotating arc gap (RAG) switch that had been previously considered for the National Ignition Facility laser system capacitor banks at Lawrence Livermore National Laboratory. The new switch is a candidate for the French CEA mega-Joule laser (LMJ) power conditioning system; switching 250 kA and <...
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