BS EN 50091-1-1:1997

Foreword
1 General
    1.1 Scope
    1.2 Normative references
    1.3 Definitions
    1.4 General requirements
    1.5 General conditions for tests
    1.6 Components
    1.7 Power interfaces
    1.8 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) circuits
    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 current
    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 UPS 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 reference load conditions
N (normative) Ventilation of battery compartments
P (Void - contents transferred to 1.2 Normative references
Q (informative) A-Deviations
R (normative) Special national conditions

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