I.S. EN 50091-1-2:2003

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 service personnel
  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
  2.13 Connection to other equipment
3 Wiring, connections and supply
  3.1 General
  3.2 Connection to power sources
  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
  5.9 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
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) Reference load conditions
N (normative) Ventilation of battery compartments
P (normative) Minimum and maximum cross-sections for
              copper conductor suitable for connection
Q (informative) A-Deviations
R (normative) Special national conditions

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