An area in which a hazardous explosive atmosphere consisting of a mixture of air and flammable gases, vapours or mists is present continuously, for long periods or frequently.
An area in which, during normal operation, a hazardous explosive atmosphere consisting of a mixture of air and flammable gases, vapours or mists may occasionally form.
An area in which, during normal operation, a hazardous explosive atmosphere consisting of a mixture of air and flammable gases, vapours or mists does not normally occur, and if it does, then only rarely and for a…
An area in which a hazardous explosive atmosphere in the form of a cloud of combustible dust suspended in the air is present continuously, for long periods or frequently.
An area in which, during normal operation, a potentially hazardous explosive atmosphere in the form of a cloud of combustible dust suspended in the air may occasionally form.
An area in which, during normal operation, a hazardous explosive atmosphere in the form of a cloud of flammable dust suspended in the air does not normally occur, and if it does, then only rarely and for a short…