IEC TR 60755:2008

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
  3.1 Definitions relating to currents flowing from live parts
       to earth
  3.2 Definitions relating to the energization of a residual
       current device
  3.3 Definitions relating to the operation and to the functions
       of the residual current device
  3.4 Definitions relating to values and ranges of energizing
       quantities
  3.5 Definitions relating to values and ranges of influencing
       quantities
  3.6 Conditions of operation
  3.7 Test
  3.8 short-circuit protective device (SCPD)
4 Classification
  4.1 Classification according to the method of operation
  4.2 Classification according to the type of installation
  4.3 Classification according to the number of poles and current
       paths
  4.4 Classification according to overcurrent protection
  4.5 Classification according to the possibility of adjusting
       the residual operating current
  4.6 Classification according to resistance against unwanted
       tripping due to current surges caused by impulse voltages
  4.7 Classification of residual current devices according to their
       operating characteristics in case of residual currents
       with d.c. components
  4.8 Classification according to the range of ambient air
       temperature
  4.9 Classification according to time-delay in presence of
       a residual current exceeding I[delta n]
  4.10 Classification according to the method of construction
5 Characteristics of residual current devices
  5.1 Summary of characteristics
  5.2 Characteristics common to all residual current devices
  5.3 Characteristics specific to residual current devices
       without integral overcurrent protection and to residual
       current devices with integral overload protection only
  5.4 Preferred or standard values
6 Marking and other product information
7 Standard conditions for operation in service and for
  installation
  7.1 Preferred ranges of application, reference values of
       influencing quantities/factors and their associated
       test tolerances
  7.2 Limits of extreme range of temperature during storage and
       transportation
8 Conditions for construction and operation
  8.1 Information and marking
  8.2 Mechanical design
  8.3 Operating characteristics
  8.4 Test device
  8.5 Temperature rise
  8.6 Resistance to humidity
  8.7 Dielectric properties
  8.8 Limiting value of non-operation in case of balanced
       load and unbalanced load
  8.9 EMC compliance and unwanted tripping
  8.10 Behaviour of residual current devices in case of overcurrent
       conditions
  8.11 Resistance of the insulation against impulse voltages
  8.12 Mechanical and electrical endurance
  8.13 Resistance to mechanical shock
  8.14 Reliability
  8.15 Condition for reclosing a reset residual current
       device (3.3.13)
  8.16 Protection against electric shock
  8.17 Resistance to heat
  8.18 Resistance to abnormal heat and to fire
  8.19 Behaviour of residual current device within ambient
       temperature range
  8.20 Behaviour of residual current device after exposure
       to extreme temperatures during storage and transportation
9 Guidance for type tests
Annex A (informative) Recommended diagram for short-circuit tests
Annex B (informative) Possible load and fault currents
Bibliography

The requirements of this technical report apply to residual current operated protective devices (hereinafter referred to as "residual current devices" (RCD)) for rated voltages not exceeding 440 V a.c., intended primarily for protection against shock hazard. They are intended to be used by technical committees when drafting product standards and apply only if they are incorporated or are referred to in the relevant standards. This report is not intended to be used as a stand-alone standard, for example, for certification. IEC 60755 has been revised in order to align the previous version with the latest editions of IEC 61008, IEC 61009, IEC 62423 and IEC 60947-2. This second edition of IEC 60755 cancels and replaces the first edition published in 1983.