IEC 60364-56 Safety Services (Emergency Systems)

Safety service is defined in IEC 60364-56 as an electrical system for electrical equipment provided to protect or warn persons in the event of a hazard, or essential to their evacuation from a location. Other standards such as IEEE refer to it as Emergency System.

Examples of safety services include:

  • emergency (escape) lighting
  • fire pumps
  • fire rescue services lifts
  • alarm systems (i.e. fire alarms, CO alarms and intruder alarms)
  • evacuation systems
  • smoke extraction systems
  • essential medical systems.

The electrical supply system for safety services are classified as:

non-automatic supply
the starting of which is initiated by an operator, or
automatic supply
the starting of which is independent of an operator.

An automatic supply is further classified according to the maximum changeover time:

  • no-break: an automatic supply which can ensure a continuous supply within specified conditions during the period of transition, for example as regards variations in voltage and frequency
  • very short break: an automatic supply available within 0.15 s
  • short break: an automatic supply available within 0.5 s
  • average break: an automatic supply available within 5 s
  • medium break: an automatic supply available within 15 s
  • long break: an automatic supply available in more than 15 s.
2803 = 2788 = 2808

About the Author

Ver Pangonilo

A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) – Australia and Professional Electrical Engineer (PEE) – Philippines with extensive experience in concept select, front-end engineering, HV & LV detail design, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and waste water pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).

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