EN 437 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM April 2021 ICS 27.060.20; 91.140.40 Supersedes EN 437:2018 English Version Test gases - Test pressures - Appliance categories Gaz d'essais - Pressions d'essais - Categories Prufgase - Prufdrucke - Geratekategorien d'appareils This European Standard was approved by CEN on 19 January 2021. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by Centre has the same status as the official versions. CEN members are the national standards bodies of Austria,Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEENDENORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels @2021CEN All rights of exploitation in any form and by any means reserved Ref.No.EN437:2021E worldwideforCENnational Members. EN 437:2021 (E) Contents Page European foreword.. 3 1 Scope 2 Normative references 3 Terms and definitions .. .4 4 4.1 Classification in gas families and groups.. 4.2 Test gases... 5 Test pressures. 12 6 Classification of appliances .... 6.1 Appliance categories. 14 6.1.1 General.. 14 6.1.2 Category I. 14 6.1.3 Category II. 6.1.4 Category III 16 6.2 Operations permitted for a change of gas or pressure, adjustment and regulating devices. 16 7 Choice of test gases and test pressures .17 8 Marking.... .18 Annex A (normative) Conditions for preparation of the test gases . Annex B (informative) National situations ... ..20 B.1 General... ..20 B.2 Categories listed in the body of the standard marketed in the different countries.... 2o B.3 Appliance supply pressures corresponding to the categories given in B.1 and B.2.... 23 B.4 Special categories marketed nationally or locally... ....27 B.4.1 General B.4.2 Categories .33 B.5 Test gases and test pressures corresponding to the special categories given in B.4... 40 B.6 Special conditions. 47 B.7 Nationai and locai gas distribution specifications relevant for defining appliance categories given in B.4.. .54 Annex C (informative) Guidelines for extension to other categories ....55 Annex D (informative) Relationship between the distributed gases and the corresponding test 56 Bibliography. 57 2 EN 437:2021(E) European foreword pressures, appliance categories and gas appliance types", the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2021, and conflicting national standards shall be withdrawn at the latest by 0ctober 2021. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 437:2018. EN 437 is intended to provide all the CEN Technical Committees preparing standards on gas appliances with definitions for test gases, test pressures and categories of appliances for use by these committees within the limits of the scope defined in Clause 1. The document seeks to clarify the present situation with respect to test gases, test pressures and appliance categories. The concern for clarity has led to the elucidation of numerous categori