IEC 62310-3:2008

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
  3.1 General definitions
  3.2 Specified values
  3.3 Input values
  3.4 Output values
4 Performance requirements
  4.1 Declared electrical characteristics
      4.1.1 Performance classification
      4.1.2 Main electrical characteristics
  4.2 Normal service conditions
  4.3 Transfer characteristics
      4.3.1 Load voltage
      4.3.2 Cross-current
  4.4 Neutral management
      4.4.1 Common neutral
      4.4.2 Separately derived neutrals
      4.4.3 Neutral current
      4.4.4 Protective earth current
  4.5 Performance requirements to be identified
      by the purchaser
5 STS tests
  5.1 General
      5.1.1 Type tests
      5.1.2 Routine tests
      5.1.3 Site tests
      5.1.4 Testing schedule
  5.2 Electrical tests
      5.2.1 Insulation and dielectric
      5.2.2 Light load and functional test
      5.2.3 No load
      5.2.4 Rated load
      5.2.5 Transfer
      5.2.6 Source tolerance
      5.2.7 Overload and fault current
      5.2.8 Operating losses
      5.2.9 Backfeed
      5.2.10 Abnormal operating conditions
  5.3 Transportation and environment
      5.3.1 General
      5.3.2 Impact and shock
      5.3.3 Free fall
      5.3.4 Storage
      5.3.5 Temperature and humidity
      5.3.6 Acoustic noise
Annex A (normative) - Reference load
Annex B (normative) - STS voltage sensing tolerance
Annex C (informative) - Neutral management in static
                        transfer systems
Annex D (normative) - Neutral switching in static transfer
                      systems - Additional requirements
Annex E (informative) - Purchaser specification guidelines
Annex F (informative) - Output short circuit test procedure
Annex G (normative) - Backfeed protection test
Annex H (normative) - Minimum and maximum cross-sections
                      of copper conductors suitable for
                      connection
Bibliography

IEC 62310-3:2008 applies to stand-alone operating a.c. static transfer systems (STS) intended to ensure the continuity of load supply through controlled transfer, with or without interruption of power, from two or more independent a.c. sources. It includes information for the overall integration of the STS and its accessories into the a.c. power network and includes requirements for the switching elements, their control and protective elements, where applicable. It concerns general and safety requirements.