BS G 227:1979

Foreword
Specification
1 Scope
2 References
Section one. Requirements
3 Materials
4 Construction
5 Fastness of colour of cables
6 Identification
7 Designation of cable
8 Packing and labelling
Section two. Tests: general
9 Introduction
Section three. Type tests
10 Voltage test at high temperature
11 Ageing in air
12 Surface creepage test
13 Low temperature
14 Heat test
15 Flexibility
16 Abrasion test
17 Simulated installation test
18 Climatic test
Section four. Type and production routine tests
19 Construction
20 Spark test on core
21 Spark and voltage tests on completed cable
22 Conductor resistance test
23 Identification, packing and labelling
Section five. Type and production quality tests
24 Voltage test on core
25 Insulation resistance test on core
26 Resistance to fluids
27 Heat cycling test
28 Flammability test
29 Fire resistance
30 Mechanical strength of wires from conductors
31 Visual inspection of conductor and braiding wires
32 Tinning test
33 Test for nickel plating of conductors
Appendices
A Maximum current rating for Tersil cables
B Formulae for braids
C Abrasion testing machine
D Ferrule for hot kerosene test
Tables
1 Hole size for simulated installation test
2 Rod diameter for fire resistance test
3 Details of Unitersil cables
4 Details of Unitersilal cables
5 Details of Unitersilmet cables
6 Details of Unitersilmetsheath cables
7 Thickness of nickel on copper conductors
8 Abrasion test weights
9 Electrical tests on cores and cables
10 Voltage test on completed metal-braided cables
11 Resistance to fluids
12 Flammability test: times of flame application
13 Tensile tests on wires from conductors
14 Maximum current rating for Tersil cables
15 Turns per metre for yarn used
16 Dimensions of ferrule for hot kerosene test
Figures
1 General arrangement of cable abrasion tester
2 View of cable abrasion tester showing detector
    roller and wire, with top weights removed
3 Details of abrasion mechanism of cable abrasion
    tester
4 Ferrule for hot kerosene test

Gives requirements for 'Tersil' type cables for aircraft wiring, for circuits where potential between conductors, or between a conductor and metal braid or the aircraft structure, does not exceed 600 V (r.m.s.), the frequency 1600 Hz and a stabilized conductor temperature of 190 Degrees C. Suitable for fixed wiring in aircraft at temperatures down to -75 Degrees C, but not suitable for severe flexing at temperatures below -55 Degrees C. Used where circuit integrity is required for a limited period during a fire. Classifies by number indicative of the conductor cross sectional area. Includes maximum current rating for Tersil cables, formulae for braids, abrasion testing machine and ferrule for hot kerosene test.