Automatic electrical controls for household and similar use -- Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements

This part of IEC 60730 applies to automatic electrical pressure sensing controls with a minimum gauge pressure rating of -60 kPa and a maximum gauge pressure rating of 4,2 MPa, for use in, on or in association with, equipment for household and similar use that may use electricity, gas, oil, solid fuel, solar thermal energy, etc. or a combination thereof, including heating, air-conditioning and similar applications. This standard applies to inherent safety, operating values, operating sequences where such are associated with equipment protection, and to the testing of automatic electrical pressure sensing controls used in, on or in association with, household and similar equipment. This standard does not apply to pressure sensing controls intended exclusively for industrial applications. This standard is also applicable to individual pressure sensing controls utilized as part of a control system or pressure sensing controls which are mechanically integral with multi-functional controls having non-electrical outputs. Automatic electrical pressure sensing controls for equipment not intended for normal household use, but which nevertheless may be used by the public, such as equipment intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. This standard is also applicable to controls for appliances within the scope of IEC 60335-1. See also Annex J. This standard applies to automatic electrical controls, mechanically or electrically operated, responsive to or controlling a pressure or vacuum. This standard applies to manual controls when such are electrically and/or mechanically integral with pressure sensing controls. This standard applies also to pressure sensing controls incorporating electronic devices, requirements for which are contained in Annex H. This standard applies also to pressure sensing controls using NTC or PTC thermistors, requirements for which are contained in Annex J.

Automatische elektrische Regel- und Steuergeräte für den Hausgebrauch und ähnliche Anwendungen -- Teil 2-6: Besondere Anforderungen an automatische elektrische Druckregel- und Steuergeräte einschließlich mechanischer Anforderungen

Dispositifs de commande électrique automatiques à usage domestique et analogue -- Partie 2-6: Règles particulières pour les dispositifs de commande électrique automatiques sensibles à la pression y compris les exigences mécaniques

S'applique aux dispositifs de commande électrique automatiques sensibles à la pression avec une caractéristique de pression effective minimale de -60 kPa et une caractéristique de pression effective maximale de 4,2 Mpa, destinés à être utilisés dans, sur, ou avec des matériels à usage domestique et analogue qui peuvent utiliser l'électricité, le gaz, le pétrole, un combustible solide, l'énergie thermique solaire, etc. ou une combinaison de ces énergies, y compris des applications de chauffage, climatisation et usages analogues. S'applique à la sécurité intrinsèque, aux valeurs et aux séquences de fonctionnement dans la mesure où elles interviennent dans la protection des matériels, ainsi qu'aux essais des dispositifs de commande électrique automatiques sensibles à la pression utilisés dans, sur ou avec des matériels à usage domestique et analogue. Cette deuxième édition constitue une révision technique, qui reprend les exigences modifiées pour les commandes électroniques de l'Annex H.

Avtomatske električne krmilne naprave za uporabo v gospodinjstvu in za podobno uporabo - 2-6. del: Posebne zahteve za avtomatske električne, na tlak občutljive naprave, vključno z mehanskimi zahtevami (IEC 60730-2-6:2007)

General Information

Status
Published
Publication Date
30-Nov-2008
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
14-Nov-2008
Due Date
19-Jan-2009
Completion Date
01-Dec-2008

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Automatische elektrische Regel- und Steuergeräte für den Hausgebrauch und ähnliche Anwendungen -- Teil 2-6: Besondere Anforderungen an automatische elektrische Druckregel- und Steuergeräte einschließlich mechanischer AnforderungenDispositifs de commande électrique automatiques à usage domestique et analogue -- Partie 2-6: Règles particulières pour les dispositifs de commande électrique automatiques sensibles à la pression y compris les exigences mécaniquesAutomatic electrical controls for household and similar use -- Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements97.120Avtomatske krmilne naprave za domAutomatic controls for household useICS:Ta slovenski standard je istoveten z:EN 60730-2-6:2008SIST EN 60730-2-6:2009en,fr,de01-januar-2009SIST EN 60730-2-6:2009SLOVENSKI

STANDARDSIST EN 60730-2-6:1997/A2:1998SIST EN 60730-2-6:1997/A1:1998SIST EN 60730-2-6:19971DGRPHãþD

SIST EN 60730-2-6:2009
EUROPEAN STANDARD EN 60730-2-6 NORME EUROPÉENNE
EUROPÄISCHE NORM September 2008

CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC -

All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60730-2-6:2008 E
ICS 97.120 Supersedes EN 60730-2-6:1995 + A1:1997 + A2:1998
English version
Automatic electrical controls for household and similar use -
Part 2-6: Particular requirements for automatic electrical pressure

sensing controls including mechanical requirements (IEC 60730-2-6:2007, modified)

Dispositifs de commande électrique automatiques à usage domestique
et analogue -
Partie 2-6: Règles particulières pour
les dispositifs de commande électrique automatiques sensibles à la pression
y compris les exigences mécaniques (CEI 60730-2-6:2007, modifiée)

Automatische elektrische Regel- und Steuergeräte für den Hausgebrauch und ähnliche Anwendungen -

Teil 2-6: Besondere Anforderungen an automatische elektrische Druckregel- und Steuergeräte einschließlich mechanischer Anforderungen (IEC 60730-2-6:2007, modifiziert)

This European Standard was approved by CENELEC on 2008-07-01. CENELEC 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 Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

SIST EN 60730-2-6:2009

EN 60730-2-6:2008 - 2 - Foreword The text of the International Standard IEC 60730-2-6:2007, prepared by IEC TC 72, Automatic controls for household use, together with the common modifications prepared by the Technical Committee CENELEC TC 72, Automatic controls for household use, was submitted to the CENELEC formal vote and was approved by CENELEC as EN 60730-2-6 on 2008-07-01. This European Standard supersedes EN 60730-2-6:1995 (+ corr. March 2001) + A1:1997 (+ corr. March 2001) + A2:1998 (+ corr. March 2001). It incorporates amended requirements for electronic controls in Annex H. The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement

(dop)

2009-07-01 – latest date by which the national standards conflicting with the EN have to be withdrawn

(dow)

2011-07-01 This Part 2-6 is to be used in conjunction with EN 60730-1:2000 + A1:2004, Automatic electrical controls for household and similar use – Part 1: General requirements, and any subsequent amendments. This Part 2-6 supplements or modifies the corresponding clauses in EN 60730-1 so as to convert that publication into the European Standard: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements. Where this Part 2-6 states "addition", "modification" or "replacement", the relevant requirement, test specification or explanatory matter in Part 1 should be adapted accordingly. Where no change is necessary, this Part 2-6 indicates that the relevant clause or subclause applies. In this publication, the following print types are used: – Requirements proper: in roman type. – Test specifications: in italic type. – Explanatory matter: in smaller roman type. Subclauses, notes, tables or figures which are additional to those in Part 1 are numbered starting from 101. This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive EMC (2004/108/EC). See Annex ZZ. Annex ZZ has been added by CENELEC. __________ SIST EN 60730-2-6:2009

- 3 - EN 60730-2-6:2008 Endorsement notice The text of the International Standard IEC 60730-2-6:2007 was approved by CENELEC as a European Standard with agreed common modifications as given below. COMMON MODIFICATIONS 10 Terminals and terminations 10.1 Terminals and terminations for external copper conductors Delete Subclause “10.1.4 Addition:”.

18 Mechanical strength 18.101 Medium leakage Delete “Under consideration.” In paragraph 4 delete the text of a) and b) and replace with “the leakage rate is 70 l/h;” in both cases.

H.26 Electromagnetic compatibility (EMC) requirements - immunity H.26.10.5.101 Delete this additional subclause and replace by “Void”. ____________ SIST EN 60730-2-6:2009

EN 60730-2-6:2008 - 4 - Annex ZZ (informative)

Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers all relevant essential requirements as given in Article 1 of Annex I of the EC Directive EMC (2004/108/EC). Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned. WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard. ___________

SIST EN 60730-2-6:2009

NORME INTERNATIONALECEIIEC INTERNATIONAL STANDARD 60730-2-6Deuxième éditionSecond edition2007-02 Dispositifs de commande électrique

automatiques à usage domestique et analogue – Partie 2-6: Règles particulières pour les dispositifs de commande électrique automatiques sensibles

à la pression y compris les exigences mécaniques Automatic electrical controls for household and similar use – Part 2-6: Particular requirements for automatic electrical pressure sensing

controls including mechanical requirements Pour prix, voir catalogue en vigueur For price, see current catalogue© IEC 2007

Droits de reproduction réservés

Copyright - all rights reserved Aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission,

3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch

Web: www.iec.ch CODE PRIX PRICE CODE T Commission Electrotechnique InternationaleInternational Electrotechnical CommissionSIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
AUTOMATIC ELECTRICAL CONTROLS FOR
HOUSEHOLD AND SIMILAR USE –

Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements

FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60730-2-6 has been prepared by IEC technical committee 72: Automatic controls for household use. This second edition cancels and replaces the first edition published in 1991, Amendment 1 (1994) and amendment 2 (1997). This second edition constitutes a technical revision, which incorporates amended requirements for electronic controls in Annex H. SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 5 –
The text of this standard is based upon the following documents:

FDIS Report on voting 72/729/FDIS 72/737/RVD Full information on the voting for the approval of this part can be found in the Report on Voting indicated in the above table. This publication has been drafted in accordance with ISO/IEC Directives, Part 2. This Part 2-6 is intended to be used in conjunction with IEC 60730-1. It was established on the basis of the third edition of that standard (1999) and its amendment 1 (2003). Consideration may be given to future editions of, or amendments to, IEC 60730-1. This Part 2-6 supplements or modifies the corresponding clauses in IEC 60730-1 so as to convert that publication into the IEC standard: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements. Where this Part 2-6 states "addition", "modification" or "replacement", the relevant requirement, test specification or explanatory matter in Part 1 should be adapted accordingly. Where no change is necessary, this Part 2-6 indicates that the relevant clause or subclause applies. In the development of a fully international standard it has been necessary to take into consideration the differing requirements resulting from practical experience in various parts of the world and to recognize the variation in national electrical systems and wiring rules. The

“in some countries” notes regarding differing national practice are contained in the following subclauses: 10.1.4 and 18.101. In this publication, the following print types are used: – Requirements proper: in roman type. – Test specifications: in italic type. – Explanatory matter: in smaller roman type. Subclauses, notes, tables or figures which are additional to those in Part 1 are numbered starting from 101. A list of all parts of the IEC 60730 series, under the general title Automatic electrical controls for household and similar use, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be

• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended.
SIST EN 60730-2-6:2009
60730-2-6 © IEC:2007 – 7 –
AUTOMATIC ELECTRICAL CONTROLS FOR
HOUSEHOLD AND SIMILAR USE –

Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements

1 Scope and normative references This clause of Part 1 is applicable except as follows: 1.1 Replacement: This part of IEC 60730 applies to automatic electrical pressure sensing controls with a minimum gauge pressure rating of –60 kPa and a maximum gauge pressure rating of 4,2 MPa, for use in, on or in association with, equipment for household and similar use that may use electricity, gas, oil, solid fuel, solar thermal energy, etc. or a combination thereof, including heating, air-conditioning and similar applications. 1.1.1 Replacement: This standard applies to inherent safety, operating values, operating sequences where such are associated with equipment protection, and to the testing of automatic electrical pressure sensing controls used in, on or in association with, household and similar equipment. Throughout this standard, the word "equipment" means "appliance and equipment". This standard does not apply to pressure sensing controls intended exclusively for industrial applications. This standard is also applicable to individual pressure sensing controls utilized as part of a control system or pressure sensing controls which are mechanically integral with multi-functional controls having non-electrical outputs. Automatic electrical pressure sensing controls for equipment not intended for normal household use, but which nevertheless may be used by the public, such as equipment intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. This standard is also applicable to controls for appliances within the scope of IEC 60335-1. See also Annex J. 1.1.2 Replacement: This standard applies to automatic electrical controls, mechanically or electrically operated, responsive to or controlling a pressure or vacuum.

1.1.3 Not applicable. SIST EN 60730-2-6:2009
60730-2-6 © IEC:2007 – 9 –

1.1.4 Replacement: This standard applies to manual controls when such are electrically and/or mechanically integral with pressure sensing controls. Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1. Addition: 1.1.101

This standard contains requirements for electrical features of pressure sensing controls and requirements for mechanical features that affect their intended operation. NOTE Subclause 18.101, as it pertains to gas and/or oil controls, is under consideration pending review or revision by ISO/TC 109 and ISO/TC 161. 1.1.102

In general, these pressure sensing controls are integrated or incorporated with the equipment or are intended to be integrated in, or on the equipment. This standard also covers these controls when they are independently mounted. In-line cord controls are not covered by this standard. 1.4 Replacement: This standard applies also to pressure sensing controls incorporating electronic devices, requirements for which are contained in Annex H. This standard applies also to pressure sensing controls using NTC or PTC thermistors, requirements for which are contained in Annex J. 2 Definitions This clause of Part 1 is applicable except as follows: 2.2 Definitions of types of control according to purpose 2.2.19 Add the following explanatory note: See 2.2.102. 2.2.20 Add the following explanatory note: See 2.2.103. Additional definitions: 2.2.101 pressure limiter pressure sensing control which is intended to keep a pressure below or above a predetermined value during normal operating conditions and which may have provision for setting by the user A pressure limiter may be of the automatic or of the manual reset type. It does not make the reverse operation during the normal duty cycle of the equipment. SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 11 –

2.2.102 pressure operating control pressure sensing control set at a high or low pressure, or both, between which limits the equipment is normally intended to operate 2.2.103 pressure cut-out pressure sensing control intended to keep a pressure below or above one particular value during abnormal operating conditions of the equipment and which has no provisions for setting by the user A pressure cut-out may be of the automatic or of the manual reset type. Normally a pressure cut-out will provide a Type 2 action. A pressure cut-out may have an adjustable stop intended to be set by the control manufacturer, the equipment manufacturer or the installer. 2.3 Definitions relating to the function of controls Additional definitions: 2.3.101 pressure medium the medium used to transmit the pressure to the pressure sensing element Pressure medium as used in this standard refers to either gases or liquids.

2.3.102 differential pressure the difference in a pressure between any two points in a system, between two systems or between a system and a reference pressure such as atmospheric pressure An example is the difference in static pressure between the upstream side of an orifice and the downstream side. 2.8 Definitions relating to component parts of controls Additional definitions: 2.8.101 vent limiting means a means which limits the flow of air from or to the atmospheric side of the diaphragm chamber 2.8.102 vent that opening from the atmospheric side of a diaphragm to the atmosphere through which air is discharged or drawn in when the control is functioning 3 General requirements This clause of Part 1 is applicable. 4 General notes on tests This clause of Part 1 is applicable except as follows: SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 13 –

4.1 Conditions of test 4.1.7 Replacement: The rates of pressure change declared in 7.2 and used in Clause 17 (i.e. α1, 1, α2, 2) shall have test tolerances as declared by the manufacturer. 4.3.1 Additional subclause: 4.3.1.101 The values in Annex AA apply for the testing of independently mounted pressure sensing controls in Clause 17. Values for integrated and incorporated controls are specified in the appropriate equipment standard. 5 Rating This clause of Part 1 is applicable. 6 Classification This clause of Part 1 is applicable except as follows: 6.3.9 Additional subclause: 6.3.9.101

pressure sensing; 6.4.3 Additional subclause: 6.4.3.101 For sensing actions, no increase in the operating value as a result of any leakage from the sensing element or from parts connecting the sensing element to the switch head (Type 2.N). 6.5.2 Modification: Instead of the second paragraph of the explanatory matter the following applies. Preferred degrees of protection provided by enclosures are: IP20, IP30, IP40, IP54 and IP65. Values differing from these values are allowed. 6.8.3 Replacement: For an independently mounted control or a control integrated or incorporated in an assembly utilizing a non-electrical energy source: 7 Information This clause of Part 1 is applicable except as follows: SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 15 –
Table 7.2 Information Clause or subclause Method
Modification:
Replace the following items by:
6 Purpose of control 2.2.101 to 2.2.103

4.3.5 6.3 D 26 Number of cycles of actuation (M) for each manual action 6.10, Annex AA X 27 Number of automatic cycles (A) for each automatic action 6.11, Annex AA X 34 Not applicable

44 Not applicable
48 Operating pressure
(or pressures) 2.3.11, 15, 18 D Additional items:
101 Pressure medium
2.3.101 X 102 Operating differential
2.3.26 D 103 Maximum working pressure 2.3.29 D Addtion to Note 4:

For pressure sensing controls, limits of activating quantity are specified either in the applicable household appliance part 2, by the appliance manufacturer or as declared by the pressure sensing control manufacturer (see 17.7 and 17.8). 8 Protection against electric shock This clause of Part 1 is applicable. 9 Provision for protective earthing This clause of Part 1 is applicable. 10 Terminals and terminations This clause of Part 1 is applicable except as follows: 10.1 Terminals and terminations for external copper conductors 10.1.4 Addition: In Canada and the USA, controls for operation above 50 volts shall be provided with suitable wiring terminals or leads for the connection of fixed wiring conductors having an ampere rating of no less than: – 1,25 times the ampere rating of a fixed electric space-heating equipment load; – 1,25 times the full-load motor current rating of a single motor; – 1,25 times the combination load of a full-load motor current and 1,25 times a fixed electric space-heating equipment load; SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 17 –

– 1,25 times the full load current of the largest motor plus the full load amperes of the other loads; – 1,0 times all other loads. 11 Constructional requirements This clause of Part 1 is applicable except as follows: 11.4 Actions Additional subclauses: 11.4.101 Type 2.N action A Type 2.N action shall be so designed that in the event of a leak in the sensing element, or in any other part between the sensing element and the switch head, the declared disconnection or interruption is provided before the sum of the declared operating pressure and drift is exceeded. Compliance is checked by the following test: The operating pressure of a Type 2.N control shall be measured under the conditions of Clause 15 of Part 1. If the control has means for setting, it shall be set to the highest value. After this measurement, a hole is artificially produced in the sensing element and the measurement of the operating pressure is repeated. No positive drift is allowed beyond the declared value. The test can be replaced by theoretical computations of the physical mode of operation. A separate shroud or sleeve may be employed for protection of the sensing element to achieve conformance with Clause 18. 11.11 Requirements during mounting, maintenance and servicing Additional subclauses: 11.11.101 Parts in contact with a diaphragm shall have no sharp burrs, projections or the like which might chafe or abrade the diaphragm. Compliance is checked by inspection before and after the tests of Clause 17. 11.11.102 An operating spring shall be retained and arranged to prevent abrasion, binding, buckling or interference with its free movement. Compliance is checked by inspection before and after the tests of Clause 17. 11.11.103 If failure of any part of the control would allow unsafe leakage of a hazardous fluid, that part shall be made of a material having a melting point (solidus temperature) of not less than 510 °C and a tensile strength of not less than 68 MPa at 204 °C. Such parts shall not sag, distort, melt, oxidize or show leakage of fluid during any of the tests specified herein. Compliance is checked by inspection and the tests of Clause 17. SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 19 –

11.11.104 A part including a sheath, capillary tube, bellows or diaphragm shall be resistant to atmospheric corrosion and attack by the fluid it may normally contact in service, if failure of the part will permit external fluid leakage of a combustible fluid or cause the control to malfunction. Brass alloys containing less than 81 % copper and more than 9 % zinc are not considered resistant to the corrosive effects of fuel oils. 11.11.105 A control in which a flexible diaphragm, bellows or similar construction constitutes the only flammable gas or fluid seal shall have the atmospheric side of the diaphragm or bellows enclosed in a casing designed to limit external fluid leakage in the event of a diaphragm or bellows rupture or shall have provisions for connection of a vent pipe or tubing intended to be routed to the outdoors or other safe location. 11.11.106 A control designed to supervise the pressure of fuel oil of 1,00 mm2/s to 600 mm2/s viscosity is not required to conform to 18.101 and 18.102, provided three samples of the control, when subjected to a 100 000 cycle endurance test, show no evidence of leakage during the test and when subjected to a hydrostatic test of four times the maximum working pressure, following the endurance test, and the control conforms to one of the following: a) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or material of equivalent resistance to corrosion designated material Class A, if leakage from a ruptured element will be into the control enclosure, in which case such leakage is to be released to the exterior of the control before entering any opening provided for conduit connection, or b) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or material of equivalent resistance to corrosion designated material Class B, if leakage from a ruptured element will be to the exterior of the control enclosure only. Suitable Class A and B materials are shown in Annex BB. 1 mm2/s = 1 centistoke. Additional subclauses: 11.101 Construction requirements relating to operating mechanism 11.101.1 If screws and nuts serve to attach operating parts to movable members, they shall be swaged or otherwise locked. 11.101.2 The operating mechanism of a manually operated switch shall not subject parts to damage. 11.101.3 Operating parts shall be separated by barriers or by their physical location from conductors to be connected to the control to avoid interference with the movement of such parts by the conductors. Compliance with 11.101.1 to 11.101.3 inclusive is checked by inspection. 11.102 A pressure cut-out shall not reset, or be resettable manually or otherwise at a value above the maximum or below the minimum operating pressure, whichever is declared. 11.103 A pressure cut-out with a manually operated reset device shall be trip-free. Compliance with 11.102 and 11.103 is checked by inspection. SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 21 –

12 Moisture and dust resistance This clause of Part 1 is applicable except as follows: 12.1.1 Addition: The tests in this subclause are not intended to determine the suitability of the seal between the control and the equipment. 13 Electric strength and insulation resistance This clause of Part 1 is applicable. 14 Heating This clause of Part 1 is applicable except as follows: 14.4.3.1 Not applicable. 15 Manufacturing deviation and drift This clause of Part 1 is applicable except as follows: 15.1 Delete the explanatory matter. Additional subclause: 15.1.101 For pressure limiters, pressure cut-outs with a Type 2 action and pressure operating controls for refrigerant fluids with a Type 2 action, the values of manufacturing deviation and drift shall be as declared by the control manufacturer. 15.4 Replacement: The operating pressure shall be declared in 7.2. The allowable deviation and drift shall not be applied for the purpose of deliberately exceeding the maximum operating pressure. 15.5.5 Additional subclause: 15.5.5.101 For controls which have set points which can be set by the user, the initial operating pressure shall be determined at the maximum and minimum set points and at a set point approximately midway between the maximum and minimum. For such controls, the maximum variations as specified in 15.4 of this standard are applicable to the maximum set point. A 5 % scale error, based on the maximum setting, may be applied to the minimum and midway set points. This scale error may be in addition to the maximum variations. SIST EN 60730-2-6:2009

60730-2-6 © IEC:2007 – 23 –
...

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