1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60079-18Standard for Explosive Atmospheres - Part 18: Equipment Protection by Encapsulation mUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUT
2、ION WITHOUT PERMISSION FROM ULNational Differences ForUL 60079-18Standard for Explosive Atmospheres - Part 18: Equipment Protection by Encapsulation mEdition: 4Edition Date: December 14, 2015Adoption of IEC 60079-18, Explosive Atmospheres Part 18: Equipment Protection byEncapsulation “m”, (fourth ed
3、ition issued December 2014) as a new IEC-based UL standard, UL60079-18 (IEC 60079-18:2014) with US National Differences.This document provides a single listing of the National Differences included in the UL adoption ofthe corresponding IEC standard.All rights reserved. No part of this publication ma
4、y be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.UL provides this standards document as is without warranty of any kind, either expressed or implied,including but not limi
5、ted to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to
6、use this standards document, even if UL or an authorized UL representative has been advisedof the possibility of such damage. In no event shall ULs liability for any damage ever exceed the pricepaid for this standards document, regardless of the form of the claim.Users of the electronic versions of
7、ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonableattorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers
8、computer system.Copyright 2015 Underwriters Laboratories Inc.DECEMBER 14, 2015NATIONAL DIFFERENCES FOR UL UL 60079-182UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPrefaceThis document provides a single listing of the technical National Diff
9、erences included in the UL adoptionof the corresponding IEC standard.In its IEC-based standards, UL uses the notations indicated below to identify national difference type, andthese types are additionally noted in this document. The standard may not use all types of thesedeviations.D1 - These are de
10、viations which are based on basic safety principles and requirements, elimination ofwhich would compromise safety for U.S. consumers and users of products.D2 - These are deviations based on safety practices. These are deviations for IEC requirements that maybe acceptable, but adopting the IEC requir
11、ements would require considerable retesting or redesign on themanufacturers part.DC - These are deviations based on the component standards and will not be deleted until a particularcomponent standard is harmonized with the IEC component standard.DE - These are deviations based on editorial comments
12、 or corrections.DR - These are deviations based on the national regulatory requirements.Each national difference contains a description of what the national difference entails. Typically one of thefollowing words is used to explain how the text of the national difference is to be applied to the base
13、 IECtext:Addition / Add - An addition entails adding a complete new numbered clause, subclause, table,figure, or annex. Addition is not meant to include adding select words to the base IEC text.Deletion / Delete - A deletion entails complete deletion of an entire numbered clause, subclause,table, fi
14、gure, or annex without any replacement text.Modification / Modify - A modification is an altering of the existing base IEC text such as theaddition, replacement or deletion of certain words or the replacement of an entire clause,subclause, table, figure, or annex of the base IEC text.DECEMBER 14, 20
15、15 NATIONAL DIFFERENCES FOR UL UL 60079-18 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences1DV DR Modification of Clause 1 to replace with the following:This part of IEC 60079 standard gives the specific requirements for t
16、he construction,testing and marking of electrical equipment, parts of electrical equipment and Excomponents with the type of protection encapsulation “m” intended for use in explosivegas atmospheres or explosive dust atmospheres.This part standard applies only for encapsulated electrical equipment,
17、encapsulated partsof electrical equipment and encapsulated Ex components (hereinafter always referred to as“m” equipment) where the rated voltage does not exceed 11 kV.The application of electrical equipment in atmospheres, which may contain explosive gasas well as combustible dust simultaneously, m
18、ay require additional protective measures.This standard does not apply to dusts of explosives, which do not require atmosphericoxygen for combustion, or to pyrophoric substances.This standard does not take account of any risk due to an emission of flammable or toxicgas from the dust.This standard su
19、pplements and modifies the general requirements of IEC 60079-0. Wherea requirement of this standard conflicts with a requirement of IEC 60079-0, the requirementof this standard takes precedence.Where references are made to other IEC 60079 standards, the referenced requirementsfound in these standard
20、s shall apply as modified by any applicable U.S. NationalDifferences.2DV DR Modification of Clause 2 references to replace with the following:ASTM-11, Specification for Wire Cloth and Sieves for Testing PurposesIEC 60079-0, Explosive atmospheres Part 0: Equipment General requirementsIEC 60079-7, Exp
21、losive atmospheres Part 7: Equipment protection by increased safety “e”IEC 60079-11, Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i”IEC 60079-15, Explosive atmospheres Part 15: Equipment protection by type of protection nIEC 60079-26, Explosive atmospheres Part 26: Equipm
22、ent with equipment protection level(EPL) GaIEC 60079-31, Explosive atmospheres Part 31: Equipment dust ignition protection byenclosures “t”IEC 60127 (all parts), Miniature fusesDECEMBER 14, 2015NATIONAL DIFFERENCES FOR UL UL 60079-184UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
23、DISTRIBUTION WITHOUT PERMISSION FROM ULIEC 60243-1, Electrical strength of insulating materials Test methods Part 1: Tests at powerfrequenciesIEC 60691, Thermal-links Requirements and application guideIEC 60730-2-9, Automatic electrical controls for household and similar use Part 2-9: Particularrequ
24、irements for temperature sensing controlsIEC 60738-1, Thermistors Directly heated positive temperature coefficient Part 1: GenericspecificationIEC 61140, Protection against electric shock Common aspects for installation and equipmentIEC 61558-1, Safety of power transformers, power supplies, reactors
25、, and similar products Part1: General requirements and testsIEC 61558-2-6, Safety of transformers, reactors, power supply units and similar products forsupply voltages up to 1 100 V Part 2-6: Particular requirements and tests for safety isolatingtransformers and power supply units incorporating safe
26、ty isolating transformersIEC 62326-4-1, Printed boards Part 4: Rigid multilayer printed boards with interlayerconnections Sectional specification Section 1: Capability detail specification Performancelevels A, B and CIPC-A-600, Acceptability of Printed BoardsIPC-6012, Qualification and Performance S
27、pecification for Rigid Printed BoardsISA 60079-26, Explosive atmospheres Part 26: Equipment for Use in Class 1, Zone 0Hazardous (Classified) LocationsISA 60079-31, Explosive atmospheres Part 31: Equipment Dust Igniton Protection by EnclosuretANSI/UL 248 (all parts), Standard for low-voltage fusesANS
28、I/UL 746B, Standard for polymeric materials Long term property evaluationsANSI/UL 796, Printed-Wiring BoardsUL 60079-0 Explosive Atmospheres Part 0: Equipment General RequirementsUL 60079-7 Explosive Atmospheres Part 7: Equipment Protection by Increased Safety eUL 60079-11 Explosive Atmospheres Part
29、 11: Equipment Protection by Intrinsic Safety iUL 60079-15 Explosive Atmospheres Part 15: Equipment Protection by Type of Protection nUL 60691, Thermal-links Requirements and application guideUL 60730-2-9, Automatic electrical controls for household and similar use Part 2-9: Particularrequirements f
30、or temperature sensing controlsDECEMBER 14, 2015 NATIONAL DIFFERENCES FOR UL UL 60079-18 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.3.1DV DR Modification of Clause 5.3.1 to replace with the following:Either the compound shall be tested
31、 in accordance with 8.1.1 or, if this test is notperformed, the certificate number for the equipment shall include the “X” suffix be markedto indicate the specific conditions of use in accordance with the specific conditions ofuse marking requirements of IEC UL 60079-0 and the specific conditions of
32、 use listed onthe certificate shall detail the precautions necessary.7.1DV DR Modification of Clause 7.1 to replace with the following:Where the compound forms part of the external enclosure it shall comply with therequirements of IEC UL 60079-0 for non metallic enclosures and non metallic parts ofe
33、nclosures.If the surface of the compound is totally or partly surrounded by an enclosure and theenclosure is part of the protection, the enclosure or parts of the enclosure shall complywith the enclosure requirements of IEC UL 60079-0Additional protective measures may be required to be provided by t
34、he user in theinstallation in order to comply with the requirements of this standard. For example,additional mechanical protection may be required to protect the equipment from a directimpact. In such cases, the certificate number for the equipment shallbe marked include the“X” suffix in accordance
35、with the marking requirements of IEC UL 60079-0 and the specificconditions of use listed in the certificate shall detail the precautions necessary.Appropriate action shall be taken to accommodate the expansion of components duringnormal operation and in the event of faults according to 7.2.In 7.2 to
36、 7.9 the requirements differ according to whether the compound adheres to theenclosure. Where adhesion is specified, the aim is to prevent the ingress of explosiveatmospheres and moisture at the boundary surfaces (for example enclosure-compound,compound-parts that are not completely embedded in the
37、compound, such as printedwiring boards, connection terminals, etc.). Where adhesion is required to maintain the typeof protection, it shall be maintained after completion of all the prescribed tests. The choiceof the compound(s) to be used for a specific application is dependent on the task eachcomp
38、ound has to perform. Testing a compound once for a given application will notqualify that compound for all applications.NOTE Tests for adhesion are under consideration.7.6.2DV DR Modification of Clause 7.6.2 to replace with the following:The Ex ma equipment shall either be supplied by a circuit in a
39、ccordance with level ofprotection “ia” according to IEC UL 60079-11 or have a connection in accordance with oneof the following requirements: for EPL Ga requirements of IEC 60079-26; for EPL Da, level of protection “ta” of IEC UL 60079-31.DECEMBER 14, 2015NATIONAL DIFFERENCES FOR UL UL 60079-186UL C
40、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.8.5DV DR Modification of Clause 7.8.5 to replace with the following:The maximum surface temperature shall be determined using the highest dischargecurrent permitted by the maximum load specified by
41、 the equipment manufacturer, or by theprotective device, see 7.9, for example 1,7 times the rating of the fuse, or at short circuit ifneither a load nor a protective device is specified.A resistor, a current limiting device or a fuse according to IEC 60127 or IEC UL 60691 orANSI/UL 248 series may be
42、 used to ensure the maximum discharge current specified bythe manufacturer of the cells or battery is not exceeded. If replaceable fuses are used theequipment shall be marked to show their rating and function.NOTE It is not a requirement of this standard that conformity to the manufacturers specific
43、ation of the resistor,current limiting device or fuse needs to be verified.7.9.1DV.1 DR Modification of Clause 7.9.1, fourth paragraph, Note 3 and Note 4 toreplace with the following:7.9.1DV.1.1 For level of protection “ma”, if the non resettable protective device complieswith IEC 60127 series or IE
44、C UL 60691 or ANSI/UL 248 series, only one device is necessary.This applies to 7.9.2 and 7.9.3.NOTE 3 It is not a requirement of this standard that conformity to the manufacturers specification of the nonresettable protective device needs to be verified.NOTE 4 ANSI/UL 248-1 contains the applicable g
45、eneral safety requirements for low-voltage fuses, including therequirements to establish breaking capacity or interrupting rating. The other parts of the ANSI/UL 248 seriesprovide additional specific safety requirements based on the intended application of the fuse, such as ANSI/UL248-14 for supplem
46、ental low-voltage fuses.7.9.3DV.1 DR Modification of Clause 7.9.3, fifth paragraph to replace with the following:7.9.5DV.1.1 Resettable thermal protective devices with switching contacts shall eithercomply with IEC UL 60730-2-9, or shall be tested according to 8.2.7.18.2.2DV DR Modification of Claus
47、e 8.2.2 to replace with the following:A sample of “m” equipment shall be subjected to a type test to ensure that:a) the temperature limits specified in 6.1 are not exceeded in normal operation;b) for level of protection “ma” and “mb” the maximum surface temperature is notexceeded under fault conditi
48、ons as defined in 7.2.1.For “m” equipment without an external load, the test shall be carried out in accordancewith the temperature measurements of IEC UL 60079-0 taking into account the supplyconditions given in 4.4.For “m” equipment with an external load, the test shall be carried out for level of
49、 protection“ma” and “mb” by adjusting the current to the highest value, which does not cause theprotective device to operate, and for level of protection “mc” at the specified loadparameters in normal operation and in the case of regular expected occurrences.DECEMBER 14, 2015 NATIONAL DIFFERENCES FOR UL UL 60079-18 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFor level of protection “ma” equipment, designed for EPL “Da” the maximum surfac
