The EN ISO 1149 standard, based on a European standard and also published by the International Organization for Standardization (ISO), describes the electrostatic properties of protective clothing and defines test methods. Electrostatics is essentially the behavior of stationary electric charges. It is the phenomenon where objects acquire an electric charge through friction against each other. This can have uncomfortable consequences for humans.
This standard consists of the following sections under the heading "Protective clothing - Electrostatic properties":
The EN 1149-1 standard describes a test method for materials intended for use in the manufacture of protective clothing (or gloves) that consume electrostatic energy to prevent incendiary discharge. This test method is not applicable for materials to be used in the manufacture of protective clothing or gloves against mains voltages.
The EN 1149-2 standard describes a test method for measuring the electrical vertical resistance of protective clothing materials. This standard does not apply to specify protection against mains voltages. More information is provided in informative Appendix A.
The EN 1149-3 standard describes the electrostatic charge reduction requirements and the appropriate test method for protective clothing that consumes electrostatic energy to avoid combustible discharges for materials not covered by the first part, for example textile materials with core conductive fibers.
The EN 1149-5 standard describes the material and design requirements for electrostatic dissipative protective clothing, including hoods and caps, used as part of a total earthed system to prevent incendiary discharges where the minimum ignition energy of an explosive atmosphere is not less than 0,016 mJ. In the context of this standard, a total earthed system is one in which personnel and other conductors are connected to earth with a resistance of less than 108 Ω. Material and design requirements do not assume adequate grounding of, for example, respirators, and additional equipment worn or carried in contact with similar clothing. If such additional equipment must be grounded, other requirements beyond the scope of this standard may be required. The scope of this standard does not cover protective gloves or shoes that consume electrostatic energy, which are separate and not an integral part of clothing. Material and design requirements may not provide adequate protection in flammable atmospheres enriched with oxygen. Additional information on flammable atmospheres enriched with oxygen is contained in the CEN/CLC/TR 16832 standard. This standard does not apply to protection against mains voltages.
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