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amount of energy apparatus approved atmospheric mixture break-spark breakdown British Standard capacitance capacitor cause ignition Chapter Class combustion wave concentration considered construction contacts determined devices diameter discharge Division 1 area Division 2 location dust hazards easily ignited effect Electrical Instrumentation electrodes enclosure energy required equipment and wiring explosion-proof housing factor of safety failure ferromagnetic flame sphere flammable flammable material flanges fuse gas or vapor gases and vapors Hazardous Areas hazardous atmospheric hazardous locations hermetically sealed hot-wire ignition hydrogen hydrostatic test ignition current ignition source ignition temperature increase inductance inductor installation Instrumentation in Hazardous insulation intrinsically safe mechanism methane minimum ignition energy National Electrical Code nonhazardous nonincendive normally operating Pentane platinum pressure probability purge system quenching distance Recommended Practice reduce reference curves required for ignition resistors safe gap sealed devices shunt element sparks specific stored energy tungsten Underwriters United Kingdom volume Zener diodes zero