| Definition: | ignition source to be considered for the identification of ignition hazards Note 1 to entry: Possible ignition sources include: - hot surfaces;
- flames and hot gases (including hot particles);
- mechanically generated sparks;
- electrical source;
- stray electric currents, cathodic corrosion protection;
- static electricity;
- lightning;
- radio frequency (RF) electromagnetic waves from 104 Hz to 3 × 1012 Hz;
- electromagnetic waves including optical radiation from 3 × 1011 Hz to 3 × 1015 Hz;
- ionizing radiation;
- ultrasonics;
- adiabatic compression and shock waves;
- exothermic reactions, including self-ignition of dusts.
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