ISA 60079-26-2011 Explosive atmospheres - Part 26 Equipment for Use in Class I Zone 0 Hazardous (Classified) Locations (12 00 03).pdf
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1、 AMERICAN NATIONAL STANDARD ANSI/ISA-60079-26 (12.00.03)-2011 Supersedes ANSI/ISA-60079-26 (12.00.03)-2008 Explosive atmospheres - Part 26: Equipment for Use in Class I, Zone 0 Hazardous (Classified) Locations Approved 11 July 2011 ANSI/ISA-60079-26 (12.00.03)-2011 Explosive atmospheres - Part 26: E
2、quipment for Use in Class I, Zone 0 Hazardous (Classified) Locations ISBN: 978-1-936007-98-1 Copyright 2011 by ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or
3、 by any means (electronic mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709- 3 - ANSI/ISA-60079-26 (12.00.03)-2011 Preface This preface, as well as all footnote
4、s and annexes, is included for information purposes and is not part of ANSI/ISA-60079-26 (12.00.03)-2011. This document has been prepared as part of the service of ISA towards a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be
5、subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 549-8288; E-m
6、ail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the ben
7、efits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards, recomm
8、ended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing requirements of a partition wall combined with an air-gap with natural ventilation; introduction
9、 of equipment protection levels (EPL) and substitution of the references to zones to corralte with the NEC. change of heading from “Mechanical connection” to “Process connection” together with a clarification of requirement for any release from zone 0 of explosive gas atmospheres. This page intentio
10、nally left blank. - 11 - ANSI/ISA-60079-26 (12.00.03)-2011 1 Scope This part of IEC 60079 standard specifies the particular requirements for construction, test and marking for electrical equipment that provides equipment protection level (EPL) Ga of Group II intended for use in Class I, Zone 0 as de
11、fined in the National Electrical Code, ANSI/NFPA 70. This electrical equipment, within the operational parameters specified by the manufacturer, ensures a very high level of protection that includes rare faults related to the equipment or two faults occurring independently of each other. NOTE 1 A ma
12、lfunction may result from a failure of the component parts of the electrical equipment or from anticipated externally applied influences. Two independent malfunctions which may occur more frequently and which, separately, would not create an ignition hazard but which, in combination, could create a
13、potential ignition hazard, should be regarded as occurring together to form a rare fault. Note 2 This electrical equipment is intended for use in Class I, Zone 0 hazardous areas, in which explosive gas atmospheres caused by mixtures of air and gases, vapours or mists under normal atmospheric conditi
14、ons are present continuously, for long periods or frequently. This standard also applies to equipment mounted across the boundary where different protection levels may be required. EXAMPLE: In the wall of a storage vessel containing zone 0 with an ambient defined as zone 1. This standard also applie
15、s to equipment installed in an area requiring a lower protection level, outside Class I, Zone 0, but electrically connected to equipment protection level (EPL) Ga inside Class I, Zone 0 (associated apparatus). This standard supplements the general requirements in IEC 60079-0 ANSI/ISA-60079-0 and the
16、 requirements of the standardized types of protection, in accordance with the IEC 60079 series, to adapt the level of safety provided by those standards in order to provide EPL Ga. NOTE 3 In designing equipment for operation in explosive gas atmospheres under conditions other than the atmospheric co
17、nditions given in IEC 60079-0 ANSI/ISA-60079-0, this standard may be used as a guide. However, additional testing is recommended related specifically to the intended conditions of use. This is particularly important when the types of protection Flameproof enclosure (IEC 60079-1 ANSI/ISA-60079-1) and
18、 Intrinsic safety (IEC 60079-11 ANSI/ISA-60079-11) are applied. NOTE 4 The classification of hazardous areas in zones is defined in IEC 60079-10 the National Electrical Code. NOTE 5 There may be other non-electrical sources of ignition (for example ultrasonic, optical or ionizing radiation) that are
19、 not addressed by this standard; these should also be taken into consideration (see, for example, EN 1127-1). NOTE 6 This concept provides equipment protection level (EPL) Ga. For further information, see Annex A ANSI/ISA-60079-0. 2 Normative references The following referenced documents are indispe
20、nsable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60079-0: Electrical apparatus for explosive gas atmospheres Part 0: General requirements AN
21、SI/ISA-60079-0 (12.00.01), Explosive atmospheres - Part 0: Equipment- General Requirements ANSI/ISA-60079-26 (12.00.03)-2011 - 12 - IEC 60079-1: Electrical apparatus for explosive gas atmospheres Part 1: Flameproof enclosures “d“ ANSI/ISA-60079-1 (12.22.01), Explosive Atmospheres - Part 1: Equipment
22、 Protection by Flameproof Enclosures “d” IEC 60079-10: Electrical apparatus for explosive gas atmospheres Part 10: Classification of hazardous areas ANSI/NFPA 70, National Electrical Code, IEC 60079-11, Electrical apparatus for explosive gas atmospheres Part 11: Intrinsic safety “i” ANSI/ISA-60079-1
23、1 (12.02.01), Explosive Atmospheres - Part 11: Equipment Protection by intrinsic safety “i” IEC 60079-14, Electrical apparatus for explosive gas atmospheres Part 14: Electrical installations in hazardous areas (other than mines) IEC 60079-18: Electrical apparatus for explosive gas atmospheres Part 1
24、8: Construction, test, and marking of type of protection encapsulation “m”electrical apparatus ANSI/ISA-60079-18, Electrical Apparatus for Use in Class I, Zone 1 Hazardous (Classified) Locations: Type of Protection Encapsulation “m” IEC 60695-11-10, Fire hazard testing Part 11-10: Test flames 50 W h
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