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EXPLOSIVE ATMOSPHERES - PART 25: INTRINSICALLY SAFE ELECTRICAL SYSTEMS
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Superseded date: 21-06-2023
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Published date: 12-01-2013
Publisher: Bureau of Indian Standards
NATIONAL FOREWORD1 Scope2 Normative references3 Terms, definitions and abbreviations4 Descriptive system document5 Grouping and classification6 Levels of protection7 Ambient temperature rating8 Interconnecting wiring/cables used in an intrinsically safe electrical system9 Requirements of cables and multi-core cables10 Termination of intrinsically safe circuits11 Earthing and bonding of intrinsically safe systems12 Protection against lightning and other electrical surges13 Assessment of an intrinsically safe system14 Marking15 Predefined systemsAnnex A (informative) - Assessment of a simple intrinsically safe systemAnnex B (normative) - Assessment of circuits with more than one source of powerAnnex C (informative) - Interconnection of non-linear and linear intrinsically safe circuitsAnnex D (normative) - Verification of inductive parametersAnnex E (informative) - A possible format for descriptive systems drawings and installation drawingsAnnex F (informative) - Surge protection of an intrinsically safe circuitAnnex G (normative) - Testing of cable electrical parametersAnnex H (informative) - Use of simple apparatus in systemsAnnex I (normative) - FISCO systemsBibliography
Describes the specific requirements for construction and assessment of intrinsically safe electrical systems, type of protection 'i', intended for use, as a whole or in part, in locations in which the use of Group I, II or III apparatus is required.
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