BS EN 50091-1:1993

Cooperating organizations
National foreword
Foreword
1 General
1.1 Scope
1.2 Definitions
1.3 General requirements
1.4 General conditions for tests
1.5 Components
1.6 Power interface
1.7 Marking and instructions
2 Fundamental design requirements
2.1 Protection against electric shock and energy
      hazards
2.2 Insulation
2.3 Safety Extra-Low Voltage (SELV)
2.4 Limited current circuits
2.5 Provisions for protective earthing
2.6 A.C. and D.C. power isolation
2.7 Overcurrent and earth fault protection
2.8 Protection of personnel - safety interlocks
2.9 Clearances, creepage distances and distances
      through insulation
2.10 External signalling circuits
2.11 Limited power source
2.12 Protection of the applied load
3 Wiring, connections and supply
3.1 General
3.2 Connection to power
3.3 Wiring terminals for external power conductors
4 Physical requirements
4.1 Stability and mechanical hazards
4.2 Mechanical strength and stress relief
4.3 Construction details
4.4 Resistance to fire
4.5 Battery location
5 Thermal and electrical requirements
5.1 Heating
5.2 Earth leakage currents
5.3 Electric strength
5.4 Abnormal operating and fault conditions
Annexes
A (normative) Test for resistance to heat and fire
B (normative) Motor test under abnormal conditions
C (normative) Transformers
D (normative) Measuring instruments for earth
      leakage current test
E (normative) Temperature rise of a winding
F (normative) Measurements of creepage distances and
      clearances
G (normative) Earth leakage current for equipment
      intended to be connected directly to IT power
      systems
H (informative) Guidance on protection against
      ingress of water and foreign objects
J (informative) Table of electrochemical potentials
K (normative) Thermal controls
L (normative) Backfeed protection test
M (normative) Examples of normal load conditions
N (normative) Ventilation of battery compartments
P (normative) Normative references to International
      Publications
Q (informative) A-Deviations
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Applicable to electronic indirect a.c. convertor systems with an electrical energy storage device in the d.c. link.