(4)Precautions against ignition. - Wherever there is danger of fire or explosion for accumulation of flammable or explosive substances in air-(a)all electrical apparatus shall either be excluded from the area of risk or they shall be such construction and so installed and maintained as to prevent the danger of their being a source of ignition;(b)effective measures shall be adopted for prevention of accumulation of static charges to a dangerous extent;(c)workers shall wear shoes without iron or steel nails or any other exposed ferrous materials which is likely to cause sparks by friction,(d)smoking, lighting or carrying of matches, lighters or smoking materials shall be prohibited;(e)transmission belts with iron fastness shall not be used; and(f)all other precautions, as are reasonably practicable, shall be taken to prevent initiation of ignition from all other possible sources such as open flammes, frictional spark overheated surfaces of machinery or plants, chemical or physical-chemical reaction and radiant heat.
