1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21975-8 SANS 8846:2008 Edition 1 ISO 8846:1990 Edition 1SOUTH AFRICAN NATIONAL STANDARD Small craft Electrical devices Protection against
4、ignition of surrounding flammable gases This national standard is the identical implementation of ISO 8846:1990, and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001
5、Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 8846:2008 Edition 1 ISO 8846:1990 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard
6、was approved by National Committee SABS TC 188, Small craft, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2008. This standard may only be used and printed by approved subscription and
7、freemailing clients of the SABS.8846 First edition 1990-l 2-01 Small craft - Electrical devices - Protection against ignition of surrounding flammable gases . 6.3.2 Fill the electrical device with a mixtui-e ratio determined by llarying the ratio to produce the maximum pressure rise as indicated by
8、the press- ure transducer. “his tnixture ratio shall then he used throughout the test. If the smallest practicable pressure transducer- cannot be installed due to the limited space available, a mixture ratio of Modify the distributor rotor contact to increase the spark gap to 2,5 mm. Connect compone
9、nts as necessary to provide a spark across the gap. Install a high tension lead to any one of the remaining towers, terminating in an earth. Align the distributor rotor contact with the towers electrode. The dis- tributor test shall consist of five extended-firing cy- cles, Each extended-firing cycl
10、e shall consist of maintaining the spark for an additional 5 min after ignition of the distributor mixture as described in 6.3.1 to 6.3.3. If the chamber mixture ignites, the distributor shall be considered to have failed. SANS 8846:2008This standard may only be used and printed by approved subscription and freemailing clients of the SABS.
