Basically, when shooting in combustable locations, like gas or oil plants, sometimes the client will ask for an ignition test certificate for all equipment.
Interesting notes Publimix. I've had my camera tested onsite by technicians who have passed it, though I've never had a certificate of any kind. Wondering if anyone has...
Passing by technicians is very well possible in certain situations because there are different zones in the Atex zone classification:
Zone 0 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapor or mist is present continuously or for long periods or frequently
Zone 1 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapor or mist is likely to occur in normal operation occasionally.
Zone 2 - A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapor or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
Hazard - Dusts
Zone 20 - A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently.
Zone 21 - A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.
Zone 22 - A place in which an explosive atmosphere in the form or a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
Effective ignition sources are:
Electric sparks. For example, a bad electrical connection.
Electrostatic discharge. Static electricity can be generated by air sliding over a wing (the fan in the FS7).