BRB之 BR566 July1989 Specification·for High impact resistant windows The information contalaed in this document is confidential and must not be used reproduced copied or disclosed, other than for the purpose for which thie specification was released. Amendments Amd.No. Date Textaffected British Railways Eoard CONTENTS PAGE 1. FOREWORD 3 2. REPERENCES 3 3. SCOPE 3 3.1 Type 1 Windscreens 3 3.2 Type 2 Windscreens 3 3.3 Type 3 Windscreens m 4. DEFINITIONS 3 5. INSTALLATION 4 6. CONSTRUCTION 4 6.1 External Facing Surface 6.2 Internal Facing Surface 6.3 Anti-Spalling 4 6.4 Testing for Spalling 5 6.5 Overall Construction 5 6.6 Sealing 5 7. PREVENTION OF PENETRATION BY MISSILES 5 7.1 Type 1 Windscreens 6 7.2 Type 2 Windscreens 6 7.3 Type 3Windscreens 6 8. OPTICAL STANDARD 6 8.1 Type 1 Windscreens 6 8.2 Type 2 Windsereens 6 8.3 Type 3 Windscreens 7 8.4 Visual Transmission 7 9. ELECTRICALREQUIREMENTS 7 9.1 Rated Voltage 7 9.2 Windscreen Heating 7 9.3 Electrical Termination 24S1A/2552q/1