Thorne & Derrick -
Leading UK Supplier Of Hazardous Area Equipment
Thorne & Derrick UK are specialist Hazardous Area Electrical Equipment Distributors. We distribute Flameproof, Explosion Proof and Intrinsically Safe electrical equipment for Zone 1, 2, 21 and 22 hazardous areas.
T&D service the global oil, gas and petrochemical industries with LV-HV hazardous area electrical equipment.
Zone 1 - where flammable atmosphere is likely to occur during normal operation.
Zone 2 - where flammable atmosphere is not likely to occur during normal operation and if it does will only exist for short period of time, typically less than 10 hours per year.
Zone 21 - a place in which an explosive atmosphere, in the form of a cloud of combustible dust in air, is likely to occur occasionally in normal operation.
Zone 22 - 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 but, if it does occur, will persist only for a short period
Hazardous Area Zones Classification