Arc on the human body hazards and protection knowledge

First, the arc of the harm to the human body mainly involves what aspects?

· Causes burns to the eyes, face, hands, chest and other parts, and can cause disability or even death in severe cases.
Blind or blind eyes.
Hearing loss as well as toxic gases at high temperatures.
High-energy arc release can produce blast shock wave, resulting in physical loss of body.
· NFPA report shows that the United States every day there will be 5-10 arc accidents, each year more than 2000 people were severely burned by the electric arc or cause death. Of the annual electrical accidents in France, 77% are electric arc accidents, of which 21% result in permanent disability. Electric arc damage to the human body is huge, how many lives are killed because of the arc, the country thus suffered a significant loss, then what about the arc standards? Here to take everyone to find out

1. OSHA Standard 29-CFR 1910 section.
Occupational safety and health standards.
3.1910 Chapter S (Electronics) Standard No. 1910.333 Specifically speaking standards for work practice and reference NFPA 70E.
4. National Fire Protection Association (NFPA) Standard 70 - The 2002 National Electronic Code (NEC) contains the warning symbol NFPA 70E 2000.
5. Institute of Electrical and Electronics Engineers (IEEE) 1584-2002 Guide to Perform Arc Flash Danger Calculations.

Second, on the arc of protection knowledge

NFPA 70E arc safety protection requirements and requirements:
Hazard level 0
Requires no droplet, flammable materials (such as cotton, wool, viscose or silk and blended materials, not less than 4.5oz). Electric arc equivalent amount 0cal / cm2.
Hazard level 1
Flame retardant shirts and fire-retardant pants, or flame-resistant piece suit. Electric arc equivalent amount 4-8cal / cm2.
Hazard class 2
Cotton underwear, fire-retardant tops and pants. Arc equivalent amount of 8-25cal / cm2.
Hazard class 3
Cotton underwear, flame-retardant tops, pants or cotton underwear plus two pieces of flame-retardant piece suit. Arc equivalent 25-
40cal / cm2.
Hazard class 4
Cotton underwear, fire-retardant shirt, fire-retardant pants, multi-layer anti-arc clothing. Arc equivalent value> 40cal / cm2.
* cal / cm2 (cal / cm2) - thermal units.
1cal - 1 gram of energy so that the water temperature increased by 1 ℃ of heat.
1cal / cm2 - equivalent to the finger on the burning cigarette butts 1 second release of energy, 1-2cal / cm2 of energy can cause secondary burns.
* ATPV Arc Value (Arc Thermal Performance Value) Arc Protection Thermal Energy Value - A key metric used to characterize the material's ability to protect against arcs. Under normal circumstances when the arc accident energy is less than this value, the material can effectively block and reduce the energy through to avoid causing human body 2 and above burns.

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