SIST EN 28846:2000

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kleine Wasserfahrzeuge - Elektrische Geräte - Zündschutz gegenüber entflammbaren Gasen (ISO 8846:1990)Navires de plaisance - Equipements électriques - Protection contre l'inflammation des gaz inflammables environnants (ISO 8846:1990)Small craft - Electrical devices - Protection against ignition of surrounding flammable gases (ISO 8846:1990)47.080ýROQLSmall craft47.020.60Electrical equipment of ships and of marine structures13.220.20Fire protectionICS:Ta slovenski standard je istoveten z:EN 28846:1993SIST EN 28846:2000en01-april-2000SIST EN 28846:2000SLOVENSKI
STANDARD



SIST EN 28846:2000



SIST EN 28846:2000



SIST EN 28846:2000



8846 First edition 1990-l 2-01 Small craft - Electrical devices - Protection against ignition of surrounding flammable gases &wires de plaisance - k!Cquipements 6lectriques --- Protection contre I’inflamma tion des gaz inf7ammables environnan ts -- -__I Reference number IS0 8846: 1990(E) SIST EN 28846:2000



IS0 8846:1990(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been establishetl has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the InternatL3nal Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an lnter- national Standard req:lires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 8846 was prepared by Technical Committee ISO/TC 188, Small craft. Annex A of this International Standard is for information only. 0 IS0 1990 All rights reserved. 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 Organization for Standardization Case Postale 56 @ Cl-l-1241 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN 28846:2000



-- INTERNATIONAL §TANDARD IS0 8846:1990(E) Small craft - Electrical Protection against ignition of surrounding flammable gases 1 Scope This International Standard describes test methods and requirements for the design of electrical devices to be used on small craft so that they may be oper- ated in an explosive atmosphere without igniting surrounding flammable gases. It does not require explosion-proof or explosion-protected electrical apparatus as defined in IEC 79-O. [II This International Standard does not cover ignition protection procedures for products or components that may operate in hydrogen and air mixtures. Nor does it cover mechanisms of ignition from external sources, such as static electricity, lightning or other factors not related to the apparatus under test. 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 flammable hydrocarbon mixture: Mixture of propane and air (per cent by volume) between the Lower Explosive Limit (LEL) and Upper Explosive Limit (UEL) that will explode if ignited by any means. Tests using propane and air are considered to cover marine fuel and air mixtures between the LEL and UEL. 2.2 ignition-protected device: Device that complies with the requirements of one of the test programmes given in clause 3. 2.3 ignition source (1) Any electrical contacts, commutator or brush assembly, or collector ring and brushes that may produce electrical arcs of ignition-capable energy. (2) Resistor or other component or surface that may operate at a temperature sufficient to ignite a flammable mixture. 2.4 normal operating conditions: Any operating conditions of the device, including the maximum achievable overload up to 400 % of the rated current (circuit breakers, switches and the like) and a stalled rotor condition for any motor with the circuit pro- tected by an overcurrent protective device specified by the product manufacturer. 3 Test programme 3.1 The external surface temperature test shall be carried out according to clause 4. 3.2 Electrical devices which can generate sparks or arcs under operation (switches, relays, gener- ators, fuses, distributors, cranking motors, etc.) shall be tested according to clause 5 if they can be con- sidered sealed and according to clause 6 if they are non-sealed. 3.3 Electrical devices showing an increase of the external surface temperature of more than 100 “C above ambient under operation shall be tested ac- cording to clause 4. Electrical devices not rated for continuous operation and wired with momentarily operated switches, such as engine-cranking motors, propulsion unit trim motors and other intermittently operated devices, are exempt from this test. 4 External surface temperature test 4.1 The electrical device shall be placed in a closed, thermally insulated air-circulating oven hav- ing an initial temperature of 60°C If: 2 OC. Suitable heating shall be provided in addition to that gener- ated by the component in order to keep the tem- perature in the oven constant at 60°C + 2 OC. - 4.2 The test voltage supply shall be adjusted within the range of 80 % to 120 % of the nominal system voltage giving the greatest temperature increase. SIST EN 28846:2000



iS0 8846:1990(E) 4.3 The electrical device shall be operated con- tinuously for a minimum of 7 h in the mode in which it draws its maximum current. 4.4 The maximum allowable surface temperature is 200 OC, measured at any point on the electrical device exterior. 5 Test method - Sealed devices Electrical devices which under operation can pro- duce sparks or arcs shall be tested according to 5.1 and 5.2 if they are considered so tight that no sur- rounding gases can penetrate into them. 5.1 Equipment A water chamber, as shown in figure 1, is needed. 5.2 Test procedure 52.1 Submerge the electrical device to be tested in a water chamber at ambient temperature, chang- ing its attitude if necessary so that all possible sources of leaks are at the top and are 340 mm to 370 mm below the waler surface. Submerged time is 15 min for each attitude change. Device under test Figure 1 - Water chamber for sealed devices 5.2.2 Observe the electrical device under test carefully throughout the test duration for a leak as evidenced by the generation of a bubble or stream of bubbles. 5.2.3 If bubbles are observed coming out of the electrical portion of the device, the electrical device shall not be considered sealed and shall be tested under clause 6. 52.4 If no bubbles are observed, remove the elec- trical device from the water chamber and dry its exterior. 5.2.5 Dismantle the electrical device for internal inspection. 5.2.6 If no water is found inside the electrical de- vice, it shall be accepted as a sealed ignition- protected device. If water is found, it shall be tested according to clause 6. 6 Test method - Non-sealed devices Testing according to 6.1 to 6.4 shall be carried out on electrical devices which under operation can produce sparks or arcs and are considered to be open so that surrounding gases can penetrate into them. Electrical devices which after testing accord- ing to clause 5 have been found to be non-sealed shall also be tested as in 6.1 to 6.4. 6.1 Equipment A test assembly as shown in figure 2 for large non- sealed electrical devices or figure 3 for small non- sealed electrical devices is needed. The test chamber shall be equipped with a pressure-relief lid. 6.2 Electrical device preparation 6.2.1 Provide means of allowing a combustible mixture of propane and air into the electr
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