1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSubject 120101March 31, 2017SUMMARY OF TOPICSThe following changes in requirements to the Standard for Safety for Definitions and InformationPertaining to Electrical Equipment in Hazardous Locati
2、ons, UL 120101, are being proposed forpreliminary review and comment only:1. For Preliminary Review Only: Proposed Second Edition of the Standard for Definitionsand Information Pertaining to Electrical Equipment in Hazardous Locations, UL 120101COMMENTS DUE: MAY 15, 2017This proposal is for review a
3、nd comment only (no ballot at this time). Please note that comments on apreliminary review document will not receive a response from the proposal author through CSDS.Instead, the proposal author will be asked to review the comments and adjust the proposals and/orsupporting rationale as the author de
4、termines to be appropriate. The preliminary review process is aninformal mechanism that provides authors with the opportunity to refine their proposals before theyadvance to the next stage in ULs standards development process.In some cases, the author of the proposals may choose to discontinue them.
5、 In this case, the authorneed not do anything after preliminary review has ended. Normally, the next step in the process is themore formal STP ballot and stakeholder review process. Only comments posted during the STP ballotand stakeholder review process will be provided with a response in CSDS.For
6、your convenience in review, proposed additions to existing requirements are shown underlined andproposed deletions are shown lined-out.1. For Preliminary Review Only: Proposed Second Edition of the Standard for Definitions andInformation Pertaining to Electrical Equipment in Hazardous Locations, UL
7、120101BACKGROUNDThis document was developed by ISA12 and is now being maintained by UL STP 60079.RATIONALEProposal submitted by: Brad Zimmermann, STP 60079 Chair on behalf of the TG79X-1R CommitteeMembersThis proposed new edition is to provide an update to the most recent information in the related
8、field.It is the proposal submitters opinion that this proposal affects the following topics/sections of theStandard: instruction requirement.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPROPOSALMARCH 31, 2017SUBJECT 120101 -2-UL COPYRIGHTED
9、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1 PurposeThis document provides definitions and information pertaining to protection techniques, terminology, andthe installation of electrical equipment in hazardous (classified) locations and provides an int
10、roduction andbasic background to the ISA 12, Electrical Safety, series of publications and committee activities. Itreplaces ANSI/ISA-12.01.01-2009, Definitions and Information Pertaining to Electrical Instruments inHazardous (Classified) Locations, published in 2009.This document provides a general
11、review of applicable codes and standards, and it should not be usedin lieu of those codes and standards for equipment design, manufacture, installation, maintenance andtest criteria.2 Scope2.1 This document provides general guidance for safe design, installation, and maintenance of electricalequipme
12、nt in hazardous (classified) locations using appropriate means to prevent ignition of flammablegases and vapors, flammable liquids, combustible dusts, or ignitable fibers or flyings.2.2 This document covers only locations made hazardous, or potentially hazardous, due to the presenceof flammable gase
13、s or vapors, flammable liquids, combustible dusts, or ignitable fibers or flyings. Thedocument is not necessarily relevant to the hazards posed by pyrophoric materials, explosives orpropellants containing their own oxidizers.2.3 This document is concerned only with design, manufacture, installation,
14、 maintenance, and test criteriarelated to arcs, sparks, or hot surfaces produced by electrical and non-electrical* equipment that maycause ignition of flammable gas or vapor-in-air mixtures, clouds or blankets of combustible dust, or easilyignitable fibers or flyings. Equipment should also comply wi
15、th the applicable ordinary locationrequirements (e.g., ANSI/ISA- UL 61010-1).* Under development (Mechanical and ESD for example). Some equipment may produce static electricity or cause hightemperatures or sparks due to mechanical failure. The materials of construction of parts in such equipment wil
16、l be an importantconsideration for application in hazardous locations.2.4 This document does not cover mechanisms of ignition from external sources, such as static electricityor lightning. Some equipment may produce static electricity. The materials of construction of parts in suchequipment will be
17、an important consideration for application in hazardous locations. The extra precautionsnecessary for this are beyond the scope of this document.2.5 This document does not consider the effects of installation in corrosive atmospheres and the resultingdeleterious conditions to the original design int
18、egrity of the equipment. The additional precautionsnecessary for these conditions are outside the scope of this document.2.6 This document is not an instruction manual. However, it is intended to provide introductory guidanceto those involved with the design, manufacture, installation, and maintenan
19、ce of equipment used inhazardous (classified) locations. It is also intended to promote uniformity of practice among those skilledin the art. Nothing contained in this document is to be construed as a fixed rule without regard to soundengineering judgment.MARCH 31, 2017SUBJECT 120101 -3-UL COPYRIGHT
20、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.7 For hazardous location equipment, atmospheric conditions are generally considered to bea) an ambient temperature range of -20 C (-4 F) to 40 C (104 F) for zones and to -25 C (-13 F) to+40 C (104 F) for d
21、ivisions;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); andNOTE Equipment specified for atmospheric conditions beyond the above is generally permitted but may be subjected to additionalrequirements.2.8 Specialized industrie
22、s such as, but not limited to, mining and shipping may be regulated by thespecific authority having jurisdiction. This document does not include specific requirements or the rulesand regulations unique to any specific industry.2.9 Various organizations have developed codes, guides, and standards tha
23、t have substantialacceptance by industry and governmental bodies. Codes, guides, and standards useful in the design andinstallation of electrical instruments in hazardous (classified) locations are listed in Annex C. These arenot considered to be a part of this document except for those specific sec
24、tions of documents referencedelsewhere in this document.2.10 In accordance with the purpose of this document, an attempt was made to avoid originality inprinciples whenever possible, but rather to utilize definitions, explanations, etc., from acceptedpublications. As a result, much of the material,
25、except for minor changes, is directly as published byothers. While specific credit is not given for each reference, all references are included in Annex B.3 DefinitionsThe following are terms and definitions commonly used for hazardous (classified) locations.NOTE The list is not intended to be all i
26、nclusive. Throughout this document, reference is made to areas, spaces, locations, andzones. These terms should be considered interchangeable terms designating a three-dimensional space. Additional definitions maybe found in IEC 60050-426 (The International Electrotechnical Vocabulary (IEV 426-04-07
27、).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, prevents the accumulation of gases or vapors to an explosivelevel
28、. Most standards and recommended practices recommend preventing levels in excess of 25 percentof the Lower Flammable Limit, LFL.NOTE Adequate ventilation of an area alone is not an effective means for the prevention of dust explosions.3.3 AEx required marking prefix for equipment meeting one or more
29、 types of protection in ANSI/ISA- UL60079-0 or ANSI/ISA-61241-0.MARCH 31, 2017SUBJECT 120101 -4-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3.4 approved acceptable to the authority having jurisdiction.NOTE 1 See AUTHORITY HAVING JURISDICTI
30、ON.NOTE 2 In determining the acceptability of installations or procedures, equipment, or material, the AUTHORITY HAVINGJURISDICTION may base acceptance on compliance with appropriate standards. In the absence of such standards, said authoritymay require evidence of proper installation, procedure, or
31、 use. The AUTHORITY HAVING JURISDICTION may also refer to thelisting or labeling practices of product-testing organizations. These organizations are in a position to determine compliance withappropriate standards for the current production of listed or labeled items.3.5 arcing device an electrical m
32、ake/break component, that is generally interpreted as capable ofproducing 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 affectthe energy in the intrinsically safe circ
33、uits and are relied upon to maintain intrinsic safety. Associatedelectrical apparatus may be eithera) electrical apparatus that has an alternative type of protection for use in the appropriate hazardous(classified) location, orb) electrical apparatus not so protected that shall not be used within a
34、hazardous (classified) location.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 Dire
35、ctive) requires zoning and risk assessment in theworkplace.3.8 authority having jurisdiction (AHJ) the organization, office, or individual that has the responsibilityand authority for approving equipment, installations, or procedures.NOTE The term AUTHORITY HAVING JURISDICTION is used in a broad man
36、ner since jurisdiction and approval agencies vary, asdo 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 i
37、nspector, or othershaving statutory authority. An insurance inspection agency, rating bureau, or other insurance company representative may be theauthority having jurisdiction. An owner or his designated agent may also assume the role. At government-owned installations, thecommanding officer, depart
38、mental official, 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 Connecting
39、to establish electrical continuity and conductivity.the permanent joining ofmetallic parts to form an electrically conductive path that will ensure electrical continuity and the capacityto conduct safely any current likely to be imposed.MARCH 31, 2017SUBJECT 120101 -5-UL COPYRIGHTED MATERIAL NOT AUT
40、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3.11 cable gland a device permitting the introduction of an electric cable into electrical equipment.3.12 certificate document that assures the conformity of a product, process, system, person, ororganization with specified re
41、quirements3.12 certified generic term referring to equipment that has been evaluated by a recognized testingagency and confirmed to be in compliance with the applicable standard(s).NOTE Some agencies use the terms approved, listed,orlabeled equipment to indicate compliance with the applicable standa
42、rd.3.13 Class I location a location in which flammable gases or vapors are or may be present in the air inquantities sufficient to produce explosive or ignitable mixtures. See 3.117, 3.119, and 3.121 for definitionsof Class I, Zones 0, 1, and 2.3.14 Class I, Division 1 location a location (1) in whi
43、ch ignitable concentrations of flammable gases orvapors can exist under normal operating conditions; (2) in which ignitable concentrations of such gases orvapors may exist frequently because of repair or maintenance operations or because of leakage; or (3) inwhich breakdown or faulty operation of eq
44、uipment or processes might release ignitable concentrations offlammable gases or vapors and might also cause simultaneous failure of electrical equipment that couldact as a source of ignition.Note: In some Division 1 locations, ignitible concentrations of flammable gases or vapors may be present con
45、tinuously or for longperiods of time. Examples include the following:(1) The inside of inadequately vented enclosures containing instruments normally venting flammable gases or vapors to the interiorof the enclosure(2) The inside of vented tanks containing volatile flammable liquids(3) The area betw
46、een the inner and outer roof sections of a floating roof tank containing volatile flammable fluids(4) Inadequately ventilated areas within spraying or coating operations using volatile flammable fluids(5) The interior of an exhaust duct that is used to vent ignitible concentrations of gases or vapor
47、sExperience has demonstrated the prudence of avoiding the installation of instrumentation or other electrical equipment in theseparticular areas altogether or where it cannot be avoided because it is essential to the process and other locations are not feasible,using electrical equipment or instrume
48、ntation approved for the specific application or consisting of intrinsically safe systems.3.15 Class I, Division 2 location a location (1) in which volatile flammable liquids or flammable gasesare handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined withi
49、nclosed containers or closed systems from which they can escape only in case of accidental rupture orbreakdown of such containers or systems, or in case of abnormal operation of equipment; or (2) in whichignitable concentrations of gases or vapors are normally prevented by positive mechanical ventilation andmight become hazardous through failure or abnormal operation of the ventilating equipment; or (3) that isadjacent to a Class I, Division 1 location and to which ignitable concentrations of gases or vapors mightoccasionally be communicated unless such communication is preven
