ENA ER P24 : ISSUE 1 ADD 1 1990

1 INTRODUCTION
2 RAILWAY SYSTEMS
3 TYPES OF SUPPLY POINT
4 LOAD ESTIMATING
5 STANDARDS OF SECURITY
6 NATURE OF TRACTION CURRENT
7 DISTURBANCE LIMITS
8 SYSTEM DISTURBANCE ESTIMATION
9 REDUCTION OF DISTURBANCES
10 EQUIPMENT
11 EARTHING
12 PROTECTION
13 SYSTEM MONITORING
14 OPERATIONAL SAFETY ASPECTS
APPENDIX A - IDENTIFICATION OF WORST
  DISTURBANCE TIMES
APPENDIX B - HARMONIC AND UNBALANCE
  STUDY DETAILS
APPENDIX C - PHASE BALANCING
APPENDIX D - REFERENCES

Specifies the procedure to be adopted when providing supplies to British Rail. Covers load estimating, standards of security, disturbance limits, system disturbance estimation and methods of reduction. Also covered are equipment details, earthing and protection arrangements and operational safety. A more recently published addendum covers limits for negative phase sequence voltages.