ISO INTERNATIONAL STANDARD 8846 First edition 1990-12-01 Small craft --- Electrical devices --. Protection against ignition of surrounding flammable gases Navires de plaisance - Equipements électriques --- Protection contre I'inflammation des gaz inflammables environnants Reference number ISO 8846:1990(E) nfor Standardizatior Noreproductionor networking permited without license from IHS Provided by IHS und Not for Resale ISO8846:1990(E) Foreword iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- work. Iso collaborates closely with the International 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 Inter- bodies casting a vote. International Standard Iso 8846 was prepared by Technical Committee ISO/TC 188, Small crafft. Annex A of this International Standard is for information only C ISO 1990 or by any means, electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. InternationalOrganizationforStandardization Case Postale 56. CH-1211 Geneve 20 Switzerland Printed in Switzerland No reproduction or networking permitted without license from IHS Not for Resale ISO 8846:1990(E) INTERNATIONAL STANDARD Small craft -- Electrical devices -- Protection against ignition of surrounding flammable gases Scope 2.4 normal operating conditions: Any operating 1 conditions of the device, including the maximum This International Standard describes test methods achievable overload up to 400 % of the rated current and requirements for the design of electrical devices (circuitbreakers,switchesandthelike)andastailed to be used on small craft so that they may be oper- rotor condition for any motor with the circuit pro- tected by an overcurrent protective device specified ated in an explosive atmosphere without igniting surrounding flammable gases. It does not require by the product manufacturer. explosion-proof or explosion-protected electrical apparatus as defined in IEC 79-0. [1] Test programme This International Standard does not cover ignition protection procedures for products or components 3.1 The external surface temperature test shall be that may operate: in hydrogen and air mixtures. Nor carried out according to clause 4. does it cover mechanisms of ignition from external sources, such as static electricity, lightning or other factors not related to the apparatus under test. 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- 2 Definitions sidered sealed and according to clause 6 if they are non-sealed For the purposes of this International Standard, the following definitions apply. 3.3 Electrical devices showing an increase of the external surface temperature of more than 100 °C 2.1 flammable hydrocarbon mixture: Mixture of above ambient under operation shall be tested ac- propane and air (per cent by volume) between the cording to clause 4. Eiectrical devices not rated for Lower Explosive Limit (LEL) and Upper Explosive continuous operation and wired with momentarily Limit (UEL) that will explode if ignited by any means. operated switches, such as engine-cranking motors Tests usingpropaneand airare consideredtocover propulsion unit trim motors and other intermittently marine fuel and air mixtures between the LEL and operated devices, are exempt from this test. UEL 2.2 ignition-protected device: Device that