Title :
Determination of electrical clearances for permissible equipment operating in gassy mines and tunnels
Author_Institution :
Mine Safety & Health Admin., US Dept. of Labor, Triadelphia, WV, USA
Abstract :
A design algorithm is derived for calculating the minimum allowable electrical clearances in alternating and direct current “permissible” equipment, which are authorized to operate in gassy mines and tunnels under Part 18 of Title 30, Code of Federal Regulations. The calculated clearances apply to operations at altitudes ranging up to 12000 ft (3658 m) above sea level. The minimum allowable clearance values are tabulated for typical nominal mining machine voltages and maximum operating temperatures within explosion-proof enclosures. An equation is provided for increasing the clearances when the listed maximum temperatures are exceeded
Keywords :
AC machines; DC machines; design engineering; explosions; mineral processing industry; mining; safety; sparks; standards; AC machines; DC machines; design algorithm; electrical clearance; explosion-proof enclosures; gassy mines; gassy tunnels; machine voltages; minimum allowable clearance values; mining safety; operating temperatures; standards; Algorithm design and analysis; Breakdown voltage; Dielectric breakdown; Dielectrics and electrical insulation; Fault location; Gas insulation; Ocean temperature; Sea level; Solids; Sparks;
Journal_Title :
Industry Applications, IEEE Transactions on
