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UK DSEAR Regulations 2002 & EC Chemical Agents(C.A.D.)

In the United Kingdom, the Dangerous Substances in ExplosibleAtmospheres Regulations (DSEAR) which came into force onDecember 9th 2002, requires operators, under a Statutory Instrument(S.I. 2002 Number 2776) of the UK government, to make use of theATEX 137 and the EC Chemical Agents (CAD) 98/24/EC directives toensure safety in the work place.

The ultimate object of the legislation is to ensure that as a minimum,the Essential Health and Safety requirements of the new approachdirectives are met.

Further information can be obtained from :-

Safety Policy Directorate of the UK Health & Safety Executive -http://www.hse.gov.uk/spd/The official publication of the European Communities ATEX Directives– found at Europa –http://europa.eu.int/comm/enterprise/atex/guide/index.htmList of European Standardisation Organisations -http://europa.eu.int/comm/enterprise/newapproach/standardization/harmstds/Standards & Technical Regulations Directorate of the UK GovernmentDepartment of Trade & Industry - http://www.dti.gov.uk/strd/atex.htm

NON ELECTRICAL EQUIPMENT

The need for non electrical apparatus to be assessed, tested, rated,labelled and certified for use in potentially explosive atmospheres wasintroduced for the first time as part of the implementation of the

ATEX Directives 94/9/EC & 1999/92/EC. Here is a summary of thestandards that have been established against which the non electricalapparatus should be tested.

EN 13463-1:2001 Non electrical equipment for use in potentially explosive atmospheres – Basic method and requirements

EN 13463-2:2004 Non electrical equipment for use in potentially explosive atmospheres – Protection by flow restricting enclosure(symbol: fr) - The explosive atmosphere is prevented from reaching the ignition source by the tight seals of theenclosure. The seals restrict the breathing of the enclosure as internal air heats and cools through operation of

the equipment.

EN 13463-3:2005 Non electrical equipment for use in potentially explosive atmospheres – Protection by flemeproof enclosure(symbol: d) - An ignition inside the equipment does not propagate the external atmosphere. This type of

protection relies on closely machined joints and a robust enclosure.

prEN 13463-4 Non electrical equipment for use in potentially explosive atmospheres – Protection by inherent safety(symbol: g) - low potential energy

EN 13463-5:2003 Non electrical equipment for use in potentially explosive atmospheres – Protection by by constructional safety(symbol: c) - Ignition hazards are eliminated by the specification of the equipment.

EN 13463-6:2005 Non electrical equipment for use in potentially explosive atmospheres – Protection by control of ignitionsources (symbol: b) - sources of ignition are only present in the event of a malfunction. The equipment is fitted

with control equipment to detect malfunctions and prevent ignition sources arising.

prEN 13463-7 Non electrical equipment for use in potentially explosive atmospheres – Protection by pressurisation (symbol:p) - draft not yet available. In general, the enclosure is purged with a protective gas (air) and pressurised to

ensure that an external atmosphere cannot re-enter the enclosure.

EN 13463-8:2003 Non electrical equipment for use in potentially explosive atmospheres – Protection by liquid immersion(symbol: k) - The enclosure has a suitable liquid to prevent the explosive atmosphere reaching the ignition

source or to cool a hot surface

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