Pressure points
BS EN 60079-2 specifies requirements for pressurised enclosures containing a limited release of a flammable substance. The standard details requirements for the design, construction, testing and marking of electrical apparatus for use in potentially explosive atmospheres in which:
– a protective gas maintained at a pressure above that of the external atmosphere is used to guard against the formation of an explosive gas atmosphere within enclosures that do not contain an internal source of release of flammable gas or vapour; and, where necessary,
– a protective gas is provided in sufficient quantity to ensure that the resultant mixture concentration around the electrical part is maintained at a value outside the explosive limit, appropriate to the particular conditions of use.
The standard includes requirements for apparatus and its associated equipment, including the inlet and exhaust ducts, and also for the auxiliary control apparatus necessary to ensure that pressurisation and/or dilution is established and maintained.
Pressure points
BSI British Standards has revised its guide to the construction and testing of electrical apparatus with pressurised p-type enclosures, intended for use in explosive gas atmospheres.
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