BS 5347:1976

Foreword
Cooperating organizations
Specification
1 Scope
2 References
3 Definitions
4 Physical and mechanical characteristics
5 Magnetic and electrical characteristics
6 Test schedules
7 Mechanical test procedures
8 Environmental test procedures
9 Electrical test procedures
10 Marking, ordering and packaging
Appendices
A Gauges for mechanical tests
B Test circuits
Tables
1 Colour code for thickness of material
2 Colour code for grade of material
3 Dimensions of single-phase cores
4 Dimensions of three-phase cores
5 Single-phase cores: characteristics for strip
    thicknesses of 0.10 mm nominal and 0.30 nominal
6 Three-phase cores: characteristics for strip
    thicknesses of 0.10 mm nominal and 0.30 nominal
Figures
A1 Box gauge for checking window dimensions
A2 Gauges for checking overall dimensions
B1 Circuit for measurement of power loss: single-phase
    cores
B2 Circuit for measurement of power loss: three-phase
    cores
B3 Circuit for measurement of apparent power: single-
    phase cores
B4 Circuit for measurement of apparent power: three-
    phase cores

Dimensions, magnetic characteristics and electrical performance of single-phase and 3-phase cores. Test methods and inspection requirements included.

This British Standard specifies strip-wound cores in both single- and three-phase forms of construction having rectangular cross-sections and rectangular windows (coil spaces). They are manufactured from cold-reduced grain-oriented silicon-iron alloy strip, 0.10 mm and 0.28 mm to 0.35 mm thick and are for use in transformers and inductors for telecommunications and electronic equipment.