1、 AMERICAN NATIONAL STANDARD ANSI/ISA-12.01.01-2013 Definitions and Information Pertaining to Electrical Equipment in Hazardous (Classified) Locations Approved 29 May 2013 ANSI/ISA-12.01.01-2013, Definitions and Information Pertaining to Electrical Equipment in Hazardous (Classified) Locations ISBN:
2、978-0-876640-24-1 Copyright 2013 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 by any means (electronic mechanical, photocopying, recording, or otherwise
3、), 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-12.01.01-2013 Preface This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-12.01
4、.01-2013. This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and
5、 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-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need fo
6、r 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 benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metri
7、c 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, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the I
8、nternational System of Units (SI): The Modern Metric System, published by the American Society for Testing and Materials as IEEE/ASTM SI 10-97, and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conversion factors. It is the policy of ISA to encourage and
9、welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports. Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual, of ISA, or
10、of any of the standards, recommended practices, and technical reports that ISA develops. CAUTION ISA DOES NOT TAKE ANY POSITION WITH RESPECT TO THE EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS ASSERTED IN CONNECTION WITH THIS DOCUMENT, AND ISA DISCLAIMS LIABILITY FOR THE INFRINGEMENT OF ANY PATENT RES
11、ULTING FROM THE USE OF THIS DOCUMENT. USERS ARE ADVISED THAT DETERMINATION OF THE VALIDITY OF ANY PATENT RIGHTS, AND THE RISK OF INFRINGEMENT OF SUCH RIGHTS, IS ENTIRELY THEIR OWN RESPONSIBILITY. PURSUANT TO ISAS PATENT POLICY, ONE OR MORE PATENT HOLDERS OR PATENT APPLICANTS MAY HAVE DISCLOSED PATEN
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13、ETTERS OF ASSURANCE, CONTACT ISA OR VISIT WWW.ISA.ORG/STANDARDSPATENTS. OTHER PATENTS OR PATENT CLAIMS MAY EXIST FOR WHICH A DISCLOSURE OR LETTER OF ASSURANCE HAS NOT BEEN RECEIVED. ISA IS NOT RESPONSIBLE FOR IDENTIFYING PATENTS OR PATENT APPLICATIONS FOR WHICH A LICENSE MAY BE REQUIRED, FOR CONDUCT
14、ING INQUIRIES INTO THE LEGAL VALIDITY OR SCOPE OF PATENTS, OR DETERMINING WHETHER ANY LICENSING TERMS OR CONDITIONS PROVIDED IN CONNECTION WITH SUBMISSION OF A LETTER OF ASSURANCE, IF ANY, OR IN ANY LICENSING AGREEMENTS ARE REASONABLE OR NON-DISCRIMINATORY. ANSI/ISA-12.01.01-2013 - 4 - ISA REQUESTS
15、THAT ANYONE REVIEWING THIS DOCUMENT WHO IS AWARE OF ANY PATENTS THAT MAY IMPACT IMPLEMENTATION OF THE DOCUMENT NOTIFY THE ISA STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER. ADDITIONALLY, THE USE OF THIS DOCUMENT MAY INVOLVE HAZARDOUS MATERIALS, OPERATIONS OR EQUIPMENT. THE DOCUMENT
16、CANNOT ANTICIPATE ALL POSSIBLE APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN HAZARDOUS CONDITIONS. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USERS PARTICULAR CIRCUMSTANCES. THE USER MUST ALSO CONSIDE
17、R THE APPLICABILITY OF ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL
18、ISSUES IN THIS VERSION. The following members of ISA subcommittee ISA12.1 contributed to the development of this document: NAME COMPANY M. Coppler, Chair Det Norske Veritas Certification Inc. D. Ankele UL LLC K. Boegli Phoenix Contact C. Bombria Consultant D. Jagger Bifold Fluid Power G. Kozinski GE
19、 Infrastructure Sensing J. Kuczka Killark C. Kurtzman Rosemount Inc. E. Leubner Cooper Crouse-Hinds R. Masek CSA Group W. Mostia SIS-Tech Solutions A. Page Consultant R. Seitz Artech Engineering D. Wechsler American Chemistry Council G. Weisenburger Adalet PLM B. Zimmermann R Stahl The following mem
20、bers of ISA committee ISA12 contributed to the development of this document: NAME COMPANY T. Schnaare, Chair Rosemount Inc. W. Lawrence, Vice Chair FM Approvals LLC M. Coppler, Managing Director Det Norske Veritas Certification Inc. R. Allen Honeywell Inc. D. Ankele UL LLC K. Boegli Phoenix Contact
21、D. Burns Shell P ANSI/ISA-12.01.01-2013 - 10 - b) air with normal oxygen content, typically 21 percent by volume; c) a pressure of 80 kPa (11.6 psia) to 110 kPa (16 psia); and NOTE Equipment specified for atmospheric conditions beyond the above is generally permitted but may be subjected to addition
22、al requirements. 2.8 Specialized industries such as, but not limited to, mining and shipping may be regulated by the specific authority having jurisdiction. This document does not include specific requirements or the rules and regulations unique to any specific industry. 2.9 Various organizations ha
23、ve developed codes, guides, and standards that have substantial acceptance by industry and governmental bodies. Codes, guides, and standards useful in the design and installation of electrical instruments in hazardous (classified) locations are listed in Annex C. These are not considered to be a par
24、t of this document except for those specific sections of documents referenced elsewhere in this document. 2.10 In accordance with the purpose of this document, an attempt was made to avoid originality in principles whenever possible, but rather to utilize definitions, explanations, etc., from accept
25、ed publications. As a result, much of the material, except for minor changes, is directly as published by others. While specific credit is not given for each reference, all references are included in Annex B. 3 Definitions The following are terms and definitions commonly used for hazardous (classifi
26、ed) locations. NOTE The list is not intended to be all inclusive. Throughout this document, reference is made to areas, spaces, locations, and zones. These terms should be considered interchangeable terms designating a three-dimensional space. Additional definitions may be found in IEC 60050-426 (Th
27、e International Electrotechnical Vocabulary (IEV 426-04-07). 3.1 accessible surface a surface to which a flammable or combustible mixture has access. 3.2 adequately ventilated area an adequately ventilated area is an area that has a ventilation system (natural or artificial) that, as a minimum, prev
28、ents the accumulation of gases or vapors to an explosive level. Most standards and recommended practices recommend preventing levels in excess of 25 percent of the Lower Flammable Limit, LFL. NOTE Adequate ventilation of an area alone is not an effective means for the prevention of dust explosions.
29、3.3 AEx required marking prefix for equipment meeting one or more types of protection in ANSI/ISA-60079-0 or ANSI/ISA-61241-0. 3.4 approved acceptable to the authority having jurisdiction. NOTE 1 See AUTHORITY HAVING JURISDICTION. - 11 - ANSI/ISA-12.01.01-2013 NOTE 2 In determining the acceptability
30、 of installations or procedures, equipment, or material, the AUTHORITY HAVING JURISDICTION may base acceptance on compliance with appropriate standards. In the absence of such standards, said authority may require evidence of proper installation, procedure, or use. The AUTHORITY HAVING JURISDICTION
31、may also refer to the listing or labeling practices of product-testing organizations. These organizations are in a position to determine compliance with appropriate standards for the current production of listed or labeled items. 3.5 arcing device an electrical make/break component, that is generall
32、y interpreted as capable of producing an arc with energy sufficient to cause ignition of a specific ignitable mixture. 3.6 associated apparatus apparatus in which the circuits are not intrinsically safe themselves but affect the energy in the intrinsically safe circuits and are relied upon to mainta
33、in intrinsic safety. Associated electrical apparatus may be either a) electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified) location, or b) electrical apparatus not so protected that shall not be used within a hazardous (classified) locatio
34、n. See also INTRINSIC SAFETY. 3.7 ATEX, ATEX Directive European Directive 94/9/EC (also referred to as ATEX 95 or 100a Directive) for electrical and mechanical equipment used in hazardous locations. A parallel directive for use, 1999/92/EC (also referred to as ATEX 137 Directive) requires zoning and
35、 risk assessment in the workplace. 3.8 authority having jurisdiction (AHJ) the organization, office, or individual that has the responsibility and authority for approving equipment, installations, or procedures. NOTE The term AUTHORITY HAVING JURISDICTION is used in a broad manner since jurisdiction
36、 and approval agencies vary, as do their responsibilities. Where public safety is primary, the authority having jurisdiction may be a federal, state/provincial, local, other regional department, or an individual such as an inspector from a labor or health department, electrical inspector, or others
37、having statutory authority. An insurance inspection agency, rating bureau, or other insurance company representative may be the authority having jurisdiction. An owner or his designated agent may also assume the role. At government-owned installations, the commanding officer, departmental official,
38、or designated agent may be the authority having jurisdiction. 3.9 automatic self-acting, operating by its own mechanism when actuated by some impersonal influence, as for example, a change in current strength, pressure, temperature, or mechanical configuration. 3.10 bonding the permanent joining of
39、metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed. 3.11 cable gland a device permitting the introduction of an electric cable into electrical equipment. ANSI/ISA-12.01.01-2013 - 12 - 3.12
40、certificate document that assures the conformity of a product, process, system, person, or organization with specified requirements 3.12 certified generic term referring to equipment that has been evaluated by a recognized testing agency and confirmed to be in compliance with the applicable standard
41、(s). NOTE Some agencies use the terms approved, listed, or labeled equipment to indicate compliance with the applicable standard. 3.13 Class I location a location in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.
42、See 3.117, 3.119, and 3.121 for definitions of Class I, Zones 0, 1, and 2. 3.14 Class I, Division 1 location a location (1) in which ignitable concentrations of flammable gases or vapors can exist under normal operating conditions; (2) in which ignitable concentrations of such gases or vapors may ex
43、ist frequently because of repair or maintenance operations or because of leakage; or (3) in which breakdown or faulty operation of equipment or processes might release ignitable concentrations of flammable gases or vapors and might also cause simultaneous failure of electrical equipment that could a
44、ct as a source of ignition. 3.15 Class I, Division 2 location a location (1) in which volatile flammable liquids or flammable gases are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can esc
45、ape only in case of accidental rupture or breakdown of such containers or systems, or in case of abnormal operation of equipment; or (2) in which ignitable concentrations of gases or vapors are normally prevented by positive mechanical ventilation and might become hazardous through failure or abnorm
46、al operation of the ventilating equipment; or (3) that is adjacent to a Class I, Division 1 location and to which ignitable concentrations of gases or vapors might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air
47、 and effective safeguards against ventilation failure are provided. 3.16 Class II location a location that is hazardous because of the presence of combustible dust. 3.17 Class II, Division 1 location a location (1) in which combustible dust is in the air under normal operating conditions in quantiti
48、es sufficient to produce explosive or ignitable mixtures; or (2) in which mechanical failure or abnormal operation of machinery or equipment might cause such explosive or ignitable mixtures to be produced and might also provide a source of ignition through simultaneous failure of electrical equipmen
49、t, operation of protection devices, or from other causes; or (3) in which combustible dusts of an electrically conductive nature may be present in hazardous quantities. - 13 - ANSI/ISA-12.01.01-2013 3.18 Class II, Division 2 location a location in which combustible dust is not normally in the air in quantities sufficient to produce explosive or ignitable mixtures and dust accumulations are normally insufficient to interfere with the normal operation of electrical equipment or other equipment, but combustible dust may be in suspension in the air as a result of infrequent malfunctioning
