Arc of Protective Clothing Knowledge
2016-01-04 08:26 | writer: admin
1. ASTM F1506 textile material standard performance specifications:
For the flame retardant textile materials used would be exposed to transient arc and other thermal hazard of electric power staff clothing, ASTM F1506 has developed a performance specification. The relevant requirements of ASTM F1506 protection including vertical combustion method (new material in after washing) and arc stage.
In addition, the standard requirements of fabric is not easy to ignite or lit to contain and extinguish burning. Flame retardant performance through FTM 5903.1 vertical combustion method (exposed to flame for 2 seconds after the maximum damage length of about 15 cm) test. Arc level set by ASTM F1959 test by ATPV or EBT value assessment.
2. ASTM F1891 arc proof standard specification of raincoat:
Waterproof and flame retardant materials this standard applies to a raincoat, fabric to produce clothing with flame retardant coating or lamination. The flame retardant performance through determination of ASTM D-6413 vertical burning method, ATPV value also need to record. Through the ASTM F1959 arc thermal performance test method for the determination of 5 and selects the minimum value of the EBT to record. In order to be more suitable for coating fabric, the present standards are being revised, in order to increase the fabric flammability test method.
3.NFPA 70 e electrical safety requirements in work environment standards:
The latest version released in 2004 USA National Fire Protection Association of the NFPA 70E standard contains various industries in the working environment of various aspects of electricity safety rules. NFPA 70E suggests that, in the case of generation of arc, arc protection, flame retardant of individual equipment, performance standards must meet ASTM F1506, ASTM F1891 and ASTM F2178 at the time of use, and the revised version request the enterprise to advance risk analysis to determine the arc arc safety limit. The standard in order to protect the safety of employees in the arc within the limits set by the use of dangerous risk classification, the ATPV values of the corresponding protective clothing to protect employees. The ATPV value of the unit is cal/cm2, represents arc thermal protection value, used to reflect the arc protective materials especially the maximum protection properties of arc protective clothing.
NFPA 70E with electric standard work for setting safety in charged equipment near the staff, specification and design the necessary steps to prevent serious injury resulting in the arc in the accident. In accordance with the provisions of NFPA 70E, each in the arc margin of safety (in the range, the release of energy greater than 1.2 cal/cm2) internal staff have to be qualified and wear appropriate flame retardant anti arc clothes. NFPA will risk risk classification is divided into 0~4 grade to represent different levels of risk. The minimum risk level is surely arc explosion suffered 4cal/cm2 energy to cause burns, namely NFPA 70E risk classification. In order to get adequate protection in the arc explodes, workers must wear NFPA certification ATPV value of thermal protection of not less than 4 grades of service.
Arc protection suit another important level set is HAF grade, HAF represents the thermal attenuation coefficient, which represents the size of the fabric to prevent heat.