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36、uncilApproved on June 19, 2015 by ANSIApproved on June 26, 2015 by IGACEffective in Canada March 31, 2017Automatic valves for gas appliancesANSI Z21.21-2015 CSA 6.5-2015ANSI Z21.21-2015 CSA 6.5-2015Automatic valves for gas appliancesJuly 2015 2015 CSA Group 1ContentsInterprovincial Gas Advisory Coun
37、cil 3Technical Committee on Performance and Installation of Gas Burning Appliances and RelatedAccessories (Z21/83) 5CSA Technical Committee on Gas Appliances and Related Accessories 8Z21/CSA Joint Technical Sub-committee on Standards for Automatic Gas Controls 10Preface 131 Scope 162 Reference publi
38、cations 173 Definitions 194 Construction 214.1 General 214.2 Equipment and data to be furnished by the manufacturer 224.3 Assembly 234.4 Connections 234.5 Bolts, nuts, and screws 254.6 Adjustments 264.7 Electrical 264.8 Materials 264.9 Instructions 274.10 Marking 275 Performance 285.1 General 285.2
39、Test gases 295.3 Strength and deformation 295.4 Leakage 335.5 Mounting for testing 345.6 Capacity 355.7 Electrical operating characteristics 395.8 Dielectric strength 425.9 Integrity of operation 435.10 Gas cracking 485.11 Continued operation 485.12 Resistance to permanent damage at excessive supply
40、 pressures 505.13 Internal explosion resistance 515.14 Marking material adhesion and legibility 526 Commercial/industrial safety shutoff valves - construction 52ANSI Z21.21-2015 CSA 6.5-2015Automatic valves for gas appliancesJuly 2015 2015 CSA Group 27 Commercial/industrial safety shutoff valves - p
41、erformance 557.3 Continued operation 557.4 Closing time 567.5 Valve closure on gas pressure surge 567.6 Nonmetallic materials 568 Manufacturing and production tests 579 Items unique to the United States 589.1 Electrical 589.1.1 Insulating material 589.1.2 Conductors and connections 599.1.3 Current-c
42、arrying parts 599.1.4 Grounding 609.1.5 Bonding 609.1.6 Switches 609.1.7 Transformers 609.1.8 Spacing 609.1.9 Barriers 649.1.10 Enclosures 6510 Items unique to Canada 65Annex A (informative) Preferred graphic symbols of commonly used items, extracted from ANSI/IEEEStandard 315, Graphic Symbols for E
43、lectrical and Electronics Diagrams, andabbreviations for these items 67Annex B (informative) Table of conversion factors 73ANSI Z21.21-2015 CSA 6.5-2015Automatic valves for gas appliancesJuly 2015 2015 CSA Group 3Interprovincial Gas Advisory CouncilJ.R. Marshall Technical Standards b) relevant claus
44、e, table, and/or figure number;c) wording of the proposed change; andd) rationale for the change.6) To submit a request for interpretation of this Standard, please send the following information toinquiriescsagroup.org and include “Request for interpretation” in the subject line:a) define the proble
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46、ttee interpretations are processed in accordance with the CSA Directives and guidelines governingstandardization and are available on the Current Standards Activities page at standardsactivities.csa.ca.ANSI Z21.21-2015 CSA 6.5-2015Automatic valves for gas appliancesJuly 2015 2015 CSA Group 14History
47、 of the development of Automatic valves for gas appliancesNote: This history is informative and is not part of the standard.With the onset of the Free Trade Agreement between the United States and Canada on January 2, 1988,significant attention was given to the harmonization of the United States and
48、 Canadian safety standardsaddressing gas-fired equipment for residential, commercial and industrial applications. It was believedthat the elimination of the differences between the standards would remove potential trade barriersand provide an atmosphere in which North American manufacturers could ma
49、rket more freely in theUnited States and Canada. The harmonization of these standards was also seen as a step towardharmonization with international standards.With the formation of joint subcommittees, a Canadian Gas Association Standards Steering Committeeon Gas Burning Appliances and Related Accessories was established to parallel Accredited StandardsCommittees Z21 and Z83, and to support the formation of joint subcommittees. Operating procedures,in accordance with American National Standards Institute procedures, for joint subcommittees
