1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60079-1Standard for Explosive Atmospheres - Part 1: Equipment Protection by Flameproof EnclosuresdUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDIST
2、RIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60079-1Standard for Explosive Atmospheres - Part 1: Equipment Protection by Flameproof Enclosures dEdition: 7Edition Date: September 18, 2015Adoption of IEC 60079-1, Explosive Atmospheres Part 1: Equipment Protection by FlameproofEnclosur
3、es “d” (seventh edition, issued June 2014) as a new IEC-based UL standard, UL 60079-1(IEC 60079-1:2014), 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
4、publication may 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,includin
5、g but not limited 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 th
6、einability to 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 electroni
7、c versions of 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 t
8、he purchasers computer system.Copyright 2015 Underwriters Laboratories Inc.SEPTEMBER 18, 2015NATIONAL DIFFERENCES FOR UL UL 60079-12UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPrefaceThis document provides a single listing of the technical
9、 National Differences 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
10、- These are deviations 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
11、the IEC requirements 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 edit
12、orial comments 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 appli
13、ed to the base 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, subcl
14、ause,table, figure, 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.S
15、EPTEMBER 18, 2015 NATIONAL DIFFERENCES FOR UL UL 60079-1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences1DV.1 DR Modification of Clause 1, first paragraph to replace with the following:1DV.1.1 This part of IEC 60079 stand
16、ard contains specific requirements for theconstruction and testing of electrical equipment with the type of protection flameproofenclosure “d”, intended for use in explosive gas atmospheres.1DV.2 DR Addition of 1DV.2.11DV.2.1 Where references are made to IEC 60079 standards, the referenced requireme
17、ntsfound in these standards shall apply as modified by any applicable U.S. NationalDifferences.2DV D1 Modification of Clause 2 references to replace with the following:The following documents, in whole or in part, are normatively referenced in this documentand are indispensable for its application.
18、For dated references, only the edition citedapplies. For undated references, the latest edition of the referenced document (includingany amendments) applies.IEC 60061 (all parts), Lamp caps and holders together with gauges for the control ofinterchangeability and safetyIEC 60079-0, Explosive atmosph
19、eres Part 0: Equipment General requirementsIEC 60079-7, Explosive 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 ofprotect
20、ion nIEC 60127 (all parts), Miniature fusesISA 60079-0, Explosive atmospheres Part 0: Equipment General requirementsISA 60079-7, Explosive atmospheres Part 7: Equipment protection by increased safety“e”ISA 60079-11, Explosive atmospheres Part 11: Equipment protection by intrinsic safety“i”ISA 60079-
21、15, Explosive atmospheres Part 15: Equipment protection by type ofprotection nSEPTEMBER 18, 2015NATIONAL DIFFERENCES FOR UL UL 60079-14UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULISO 965-1, ISO general-purpose metric screw threads Toleranc
22、es Part 1: Principles andbasic dataISO 965-3, ISO general-purpose metric screw threads Tolerances Part 3: Deviations forconstructional screw threadsISO 2738, Sintered metal materials, excluding hardmetals Permeable sintered metalmaterials Determination of density, oil content and open porosityISO 40
23、03, Permeable sintered metal materials Determination of bubble test pore sizeISO 4022, Permeable sintered metal materials Determination of fluid permeabilityANSI/ASME B1.20.1, Pipe threads, general purpose (inch)UL 94 Tests for Flammability of Plastic Materials for Parts in Devices and AppliancesUL
24、2225 Metal-Clad Cables and Cable-Sealing Fittings for Use in Hazardous (Classified)LocationsUL 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 11: Equipment P
25、rotection by Intrinsic Safety iUL 60079-15 Explosive Atmospheres Part 15: Equipment Protection by Type ofProtection n3.7DV DE Modification of Clause 3.7 to replace with the following:maximum experimental safe gap (for an explosive mixture) MESG maximum gap of a jointof 25 mm in width which prevents
26、any transmission of an explosion during 10 tests madeunder the conditions specified in IEC 60079-20-1 2NOTE 1 to entry: ANSI/NFPA 497 also includes information on (MESG) including a table of values.SEPTEMBER 18, 2015 NATIONAL DIFFERENCES FOR UL UL 60079-1 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
27、FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3.16DV DR Modification of Clause 3.16 to replace with the following:3.16.1DV Ex equipment blanking element threaded blanking elements for Group I or II,and non-threaded blanking elements for Group I, that are intended to close unused entr
28、ies, are tested separately from the equipment enclosure, have an equipment certificate, and are intended to be fitted to the equipment enclosure without further considerationNote 1 to entry: This does not preclude a component certificate for Ex component blanking elements inaccordance with IEC UL 60
29、079-0. Examples of blanking elements are shown in Figure C.1.Note 2 to entry: Non-threaded blanking elements are not equipment for Group II applications.5.1DV.1 DR Modification of Clause 5.1, to replace with the following:All flameproof joints, whether permanently closed or designed to be opened fro
30、m time totime, shall comply, in the absence of pressure, with the appropriate requirements of Clause5.The design of joints shall be appropriate to the mechanical constraints applied to them.The dimensions given in 5.2 to 5.5 specify the essential parameters of flamepaths. Ininstances where any of th
31、e following apply (for example, in order to comply with the testfor non-transmission of an internal ignition): the minimum length of the flameproof joint as stated by the documentation is greaterthan the relevant minimum; or the maximum gap of the flameproof joint as stated by the documentation is l
32、ess than therelevant maximum; or the minimum number of threads engaged for the flameproof joint as stated by thedocumentation is more than the relevant minimum;NOTE 1 IEC UL 60079-0 defines the documentation as the documents that give a full and correct specification ofthe explosion safety aspects o
33、f the electrical equipment.the equipment certificate number shall include the X suffix in accordance with the shallbe marked according to marking requirements of IEC UL 60079-0 to indicate that there areand the specific conditions of use listed in the instructions on the certificate and in the.The i
34、nstructions shall detail one of the following: dimensions of the flameproof joints shall be detailed; or specific drawing referenced that details the dimensions of the flameproof joints; or specific guidance noted to contact the original manufacturer for information on thedimensions of the flameproo
35、f joints; orSEPTEMBER 18, 2015NATIONAL DIFFERENCES FOR UL UL 60079-16UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL specific indication that the flameproof joints are not intended to be repaired.NOTE 2 IEC UL 60079-0 permits the use of an ad
36、visory marking on the equipment as an alternative to theconditions of use in the instructions for the requirements for the “X” marking.The surface of joints may be protected against corrosion.Coating with paint or powder-coat finish is not permitted. Other coating material may beused if the material
37、 and application procedure have been shown not to adversely affect theflameproof properties of the joint.Corrosion inhibiting grease, such as petrolatum or soap-thickened mineral oils, may beapplied to joint surfaces before assembly. The grease, if applied, shall be of a type thatdoes not harden bec
38、ause of ageing, does not contain an evaporating solvent, and does notcause corrosion of the joint surfaces. Verification of suitability shall be in accordance withthe grease manufacturers specifications.Joint surfaces may be electroplated. The metal plating, if applied, shall be in accordancewith th
39、e following: if not more than 0,008 mm thick, no additional consideration is necessary; if more than 0,008 mm thick, then the maximum gap without the plating shall still be inaccordance with the applicable joint requirements, and shall be tested for flametransmission based on the gap dimension that
40、would exist without the plating.Note: Anodizing of aluminum enclosures is not considered to be plating.A thread locking compound shall be permitted as a sealant on threaded joints that are notintended to be opened after assembly.SEPTEMBER 18, 2015 NATIONAL DIFFERENCES FOR UL UL 60079-1 7UL COPYRIGHT
41、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.2.9DV.1 DR Modification of Clause 5.2.9 to replace with the following:5.2.9DV.1.1 A multi-step joint shall consist of not less than 3 adjacent segments where thepath changes direction not less than two tim
42、es by 90 5.Multi-step joints need not comply with the requirements of Tables 2 or 3 but shall satisfythe test requirements of 15.3 with the test length of each segment reduced to not morethan 75 % of the manufacturers specified design minimum lengths.For flameproof enclosures that incorporate multi-
43、step joints, the equipment certificatenumber shall include the X suffix be marked in accordance with the markingrequirements of IEC UL 60079-0 and the specific conditions of use listed on the certificateinstructions shall detail one of the following: dimensions of the flameproof joints shall be deta
44、iled; or specific drawing referenced that details the dimensions of the flameproof joints; or specific guidance noted to contact the original manufacturer for information on thedimensions of the flameproof joints; or specific indication that the flameproof joints are not intended to be repaired.NOTE
45、 1 IEC UL 60079-0 permits the use of an advisory marking on the equipment as an alternative to theconditions of use in the instructions for the requirements for the “X” marking .NOTE 2 Multi-step joints are distinct from labyrinth joints on rotating shafts as addressed in this standard (see8.1.3).Ta
46、ble 5DV DR Modification of Table 5DV to replace with the following:Table 5DV Taper threaded jointsa, cThreads provided on each part 5baInternal and external thread shall have the same nominal size.bThreads shall conform to the NPT requirements of ANSI/ASME B1.20.1 and shall be made-up wrench tight.E
47、xternal threaded parts shall be provided with:1) an effective thread length not less than the “L2” dimension; and2) if a shoulder is provided, a length not less than the “L4” dimension between the face ofthe shoulder and end of the thread.Internal threads shall gauge at “flush” to “2 3-1/2 turns lar
48、ge” using an L1 plug-gauge.cWhere the tapered threaded joint consists of both the internal and external threaded parts with at least 4,5fully engaged threads, the requirements of footnote b in this table need not be applied.NOTE See Annex C for tapered thread requirements applicable to flameproof en
49、try devices.SEPTEMBER 18, 2015NATIONAL DIFFERENCES FOR UL UL 60079-18UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.2.1DV.1 DE Modification of Clause 6.2.1 to replace with the following:Fused glass joints are glass-to-metal joints formed by the application of molten glass intoa metal frame that results in either a chemical or physical bond between the glass and themetal frame.NOTE 1: Fused glass joints do not have a flamepath
