BS G 208:1970

Specification
Foreword
1 General requirements
1.1 Scope
1.2 General
1.3 Declarations
1.4 Markings
2 Particular requirements
2.1 Construction
2.2 Environmental requirements
2.3 Magnetic interference
2.4 Radio interference
2.5 Transient voltages
2.6 Flammability
2.7 Explosion proofness
2.8 Fluid contamination
2.9 Salt corrosion
3 Tests
3.1 General
Type tests
3.2 Strength of terminals
3.3 Tests (at normal ambient temperatures)
3.3.1 Coil resistance
3.3.2 Terminal voltage drop - low voltage
3.3.3 Terminal voltage drop - nominal voltage
3.3.4 Pull-in
3.3.5 Drop-out
3.3.6 Pull-in time
3.3.7 Drop-out time
3.3.8 Dielectric strength
3.3.9 Insulation resistance
3.4 High temperature tests (at maximum ambient
       temperature)
3.5 Electrical endurance test
3.6 Tests to be carried out after the endurance test
3.7 Electrical overload test
3.8 Short circuit tests
3.9 Measurement of compass safe distance
3.10 Radio interference (a.c. energized relays) test
3.11 Transient voltage test
3.12 Acceleration test
3.13 Vibration test
3.14 Climatic tests
3.15 Relay sealing test (hermetically sealed relays)
3.16 Explosion proofness test
3.17 Salt corrosion test
3.18 Fluid contamination test
3.19 Strip examination and report
Production acceptance tests
3.20 Markings
3.21 Functioning tests (at normal ambient
       temperatures)
3.22 Relay sealing test (hermetically sealed relays)
Quality assurance tests
3.23 General
3.24 Selection of samples
3.25 Test schedule
Appendices
A Type test schedule
B Quality assurance test schedule
C Fluid contamination procedure
Figure
1 Typical short circuit test circuit

Gives the requirements for electrical relays of ratings up to 10 A for use on 28 V d.c. and 115/200 V three-phase 400 Hz a.c. aircraft systems which are suitable for direct mounting to aircraft structure and plug-in types. Includes marking details, type test schedule, quality assurance test schedule and fluid contamination procedure. Illustrates typical short circuit test circuit.