Mine Safety and Health Administration May 17, 2006 – Federal Register Recent Federal Regulation Documents

MSHA reviewed the requirements of the International Electrotechnical Commission's (IEC) standards for Electrical Apparatus for Explosive Gas Atmospheres to determine if they are equivalent to the Agency's applicable product approval requirements or can be modified to provide at least the same degree of protection as those requirements. MSHA has determined that the IEC's standards for explosion-proof enclosures, with modifications, provide the same degree of protection as MSHA's applicable product approval requirements. Applicants may request that MSHA grant product approval for explosion- proof (flameproof) enclosures based on compliance with the IEC standards provided MSHA's specified list of modifications is also addressed in the submitted design.