With summer in full swing, the National Fire Protection Association (NFPA) and Electrical Safety Foundation International (ESFI) are joining forces to remind people about the potential electrical hazards in swimming pools, hot tubs and spas, on board boats and in the waters surrounding boats, marinas and launch ramps.
An arc flash at the Panda Power station in south Sherman, Texas, sent one employee to the hospital. An employee was de-energizing on a breaker when an arc flash occurred.
The accident happened around 7:30 a.m.
In the first case study, an electrician was working on a circuit breaker panel that he thought was deenergized. After completing the work, the electrician was closing one of the enclosure doors when an arc flash occurred.
An electric arc flash injured a worker at a power generating facility. When the arc flash occurred, a 48-year-old electrician was working on an electrical cabinet that was still powered. The wiring contractor employee suffered second and third-degree burns to his hands, arms and torso.
In general, the employer must:
Assess the workplace to identify employees exposed to hazards from flames or from electric arcs;
Make reasonable estimates of the incident heat energy of any electric-arc hazard to which an employee would be exposed;
It is estimated that 5 to 10 arc flash explosions occur in electric equipment every day in the United States.
In the mining industry the largest single injury category of electrical injuries are caused by non-contact electrical arcs.
A journeyman electrician and an electrical helper were at a worksite to install a new three-phase run of wire between an existing energized 480-volt circuit breaker panel and a new piece of machinery. During the process, the journeyman electrician attempted to install a missing bolt from a breaker mount on an energized 480-volt bus bar.
Electricity can cause two types of burns: electrical burns from direct contact with current and thermal burns from arc flashes and blasts. An arc flash occurs when powerful, high-amperage currents travel, or arc, through the air. This can occur when high voltage differences exist across a gap between conductors.
Arc flash generally refers to the dangerous exposure to thermal energy released by an arcing fault on an electrical power system. In recent years, arc flash hazards have become a prominent safety issue in many industries.