BS 2857:1976

Foreword
Cooperating organizations
Specification
1 Scope
2 References
3 Definitions
4 Physical and mechanical characteristics
5 Magnetic characteristics
Appendix
A Method for the calculations of effective parameters
Tables
1 Material classification
2 Dimensions of EI range laminations
3 Dimensions of EE range laminations
4 Dimensions of F range laminations
5 Dimensions of E range laminations
6 Dimensions of ED range laminations
7 Dimensions of EE(L) range laminations
8 Dimensions of F(L) range laminations
9 Thickness and burr limits
10 Minimum space factor
11 Core constants for EI range laminations
12 Core constants for EE and F range laminations
13 Core constants for E range laminations
14 Core constants for ED range laminations
15 Core constants for EE(L) and F(L) range laminations
16 Minimum permeability for EI range laminations
17 Minimum permeability for EE range laminations
18 Minimum permeability for E range laminations
19 Minimum permeability for ED range laminations
20 Minimum permeability for EE(L) range laminations
21 Minimum equivalent parallel resistance coefficient
    for EI range laminations, milliohms/turn squared
22 Minimum equivalent parallel resistance coefficient
    for EE range laminations, milliohms/turn squared
23 Minimum equivalent parallel resistance coefficient
    for E range laminations, milliohms/turn squared
24 Minimum equivalent parallel resistance coefficient
    for ED range laminations, milliohms/turn squared
25 Minimum equivalent parallel resistance coefficient
    for EE(L) range laminations, milliohms/turn squared
26 Minimum remanence ratio for ED range laminations
Figures
1 Test coil and clamping device for measurements of
    EI, EE, EE(L) and ED range laminations
2 Test coil and clamping device for measurements on F
    and F(L) range laminations
3 Impedance bridge circuit for the measurement of
    equivalent permeability
4 Bridge circuit for the measurement of equivalent
    parallel resistance
5 Circuit for the measurement of remanence ratio
6 Circuit for the measurement of incremental
    permeability
7 Magnetic circuit elements