The 2015 Edition of NFPA 70E has been finalized. Significant revisions from the 2012 edition include: • Elimination of HRC 0 moving all electrical work into arc rated clothing (non melting clothing required under AR clothing). • New RISK BASED Assessment Tables with...
I regularly conduct NFPA 70E training courses. Listed below are two questions that may enhance your understanding of electric arcs with respect to receptacles as well as residential homes: 1. Is there an electric arc flash hazard from a 120 volt electrical receptacle?...
Trapped Under The Sea is an excellent book written by Neil Swidey that examines the 1999 Boston Harbor tunnel project confined space tragedy. Workers were required to descend 420 feet vertically into a tunnel and then travel 9 miles horizontally through the tunnel to...
On April 11, 2014 OSHA will publish the revised 1910.269 - Electric Power Generation, Transmission, and Distribution standard in the federal register. The effective date will be 90 days after publication. Among the changes, there will be PPE changes - specifically...
1910.146 (b) of OSHA's Permit-Required Confined Space standard defines a hazardous atmosphere as follows: "Flammable gas, vapor, or mist in excess of 10 percent of its lower flammable limit (LFL);". However, whenever I conduct onsite confined training courses for...
Electrically classified areas for flammable liquids (Class I), combustible dust (Class II), as well as fibers and flyings (Class III) require explosion proof electrical wiring within the classified area. You also need to be concerned about any workers who may attempt...
Over half of all electric arcs occur at 277 volts. There are a few reasons for this. One reason is 277 vac is a single phase circuit of a three phase 480 vac circuit. This circuit typically provides considerable fault current, in amps. A second reason is due to the...
During a recent presentation on flammable and combustible liquids, I was asked about grounding and bonding requirements while dispensing flammable liquids with a flashpoint of 99 degrees Fahrenheit and below. Stewart R. Browne Manufacturing (770.993.9600) has an...
It's been my experience that some of the most significant electric arcs occur during the racking of draw out circuit breakers; I have written on the potential hazards while performing this work task. See the picture below of the inside of a typical rackable circuit...
I have 12 students registered for the NFPA 70E course scheduled for May 10th. I have additional seats available. Please let me know if you're interested: Click here for more information. Jon