FLAMEPROOF headlights can exceed a surface temperature of 150 degree Celsius, according to a New South Wales Department of Primary Industries (DPI) safety bulletin.
The Bulletin (No. SB08-02) said variation in voltage, angle of inclination to the headlight, the type of lamp within the headlight and the ventilation all impact the surface temperature.
The report also discussed the premature failure of headlights due to excessive internal heat and the possibility of 12 volt lamps being supplied with 13.8 volts.
According to the Electrical apparatus for explosive gas atmospheres manual, all explosion protected equipment must be marked with an ‘X’ to indicate special conditions for safe use.
The DPI recommended these safety requirements be passed onto the purchaser and that headlights not be operated at a voltage greater than specified.
Mine Safety Operations Branch
NSW Department of Primary Industries