BS 4846:1972

Foreword
Specification
1. General
1.1 Scope
1.2 Definitions
1.3 Categories of tests
2. Conditions to be satisfied by resistors
2.1 Resistance values
2.2 Temperature rises
2.3 Short-circuit withstand
2.4 Vibration and shock withstand
2.5 Protection against corrosion
2.6 Performance in rain and snow
3. Tests
3.1 List of tests
3.2 Check on characteristics of resistor material (type
     test)
3.3 Check on rated resistance (type and routine tests)
3.4 Temperature-rise tests (type tests)
3.5 Tests for withstanding vibration and shock
     (optional type test)
3.6 Dielectric tests (routine test)
3.7 Hygroscopic test (optional type test)
3.8 Short-circuit test (optional type test)
3.9 Test for performance in rain (type test)
3.10 Condition of resistor after test
4. Rating plate
4.1 General
Tables
1. Tolerances on the resistance of boxes, frames,
     blocks or sections of resistors and complete
     resistors
2. Tolerances on the resistance of resistor elements
3. List of tests

Specifies requirements for various types of resistor used in the power circuits of electrically powered vehicles supplied with high voltage d.c. or a.c., vehicles capable of being supplied from different systems, and vehicles with an independent power source. The standard does not apply to road vehicles.