GB/T 12476.10-2010 Electrical apparatus for use in the presence of combustible dust—Part 10:Test methods—Method for determining minimum ignition energy of dust/air mixtures

Scope

This part of GB 12476 specifies the method for determining the minimum ignition energy required for a dust-air mixture to be ignited by a high-voltage direct current spark. This test method aims to establish data to determine whether electrical discharges have the ability to ignite combustible dust-air mixtures. The state of the tested dust (particle size, moisture content, etc.) should represent the actual use state, so that the actual hazard can be evaluated. The ignition energy determined by this method can be compared with the ignition energy of other dusts to assess the corresponding ignition hazard caused by electrical or electrostatic discharges, and thus determine whether electrical equipment is suitable for installation in areas where combustible dust exists.
This test method is not applicable to recognized explosives, black powder, yellow explosives, oxygen-free combustion explosives, self-igniting substances, or substances or mixtures of these substances that exhibit similar characteristics under certain conditions. If the presence of a hazard is suspected due to explosive properties, a small amount of the above-mentioned dust can be placed on the heating surface of the equipment described in GB 12476.8—2010 and heated to 400 °C to obtain an indicator.
Note: It is advisable to take some measures to protect the test personnel from the risks of fire, explosion, and/or combustion, including the toxic gases formed by combustion. Compliance with this national standard does not exempt them from their legal responsibilities.
Appendix B of this part includes guidelines for the minimum effective ignition energy of related electrostatic discharges.

Development Information

Same series standard

Superseded by the following standards

Referenced Standards

Adopt standards

Related Standards