What Is a Permanently Connected Electrical Equipment?

The term ‘permanently connected equipment’ is officially defined within the IEC 61010-1 as:

equipment that is electrically connected to a supply by means of a permanent connection which can be detached only by the use of a tool.

IEC 61010-1:2010+AMD1:2016 CSV

The terms “permanently installed equipment” and “permanently connected apparatus” are often used incorrectly in place of this term.

The electrical installations of buildings always contain electrical equipment that is permanently connected to their electrical circuits. Such electrical equipment primarily includes stationary electrical equipment, which is connected to the switchgear of the electrical installation of a building and to the conductors of its electrical wiring with various terminals and other means that require the use of tools.

Examples

The most typical examples of permanently connected electrical equipment are fixed electric lights installed in ceilings and on the walls of buildings. However, socket-outlets are often used to connect stationary electrical equipment for household purposes, such as washing machines, electric stoves, refrigerators, air conditioners, etc. Hand-held electrical equipment and mobile electrical equipment are usually connected to the electrical circuits of the electrical installation of a building via socket-outlets.

Ceiling light fixture an example of permanently connected electrical equipment
Ceiling light fixture an example of permanently connected electrical equipment

Main Requirements

  1. For permanently connected electrical equipment, the protective conductor terminal shall be located near the mains supply terminals.
  2. Protective bonding of permanently connected electrical equipment shall be of low impedance.
  3. Permanently connected equipment shall employ a switch or circuit-breaker as the means for disconnection.
  4. Overcurrent protection devices are optional in permanently connected electrical equipment. If none are fitted, the installation instructions shall specify the characteristics of the overcurrent protection devices required in the building installation.
  5. For permanently connected electrical equipment, the installation instructions shall specify the maximum rating of an overcurrent protective device to be provided external to the equipment, unless there are appropriate overcurrent protective devices in the equipment.
  6. For permanently connected equipment provided with terminal(s) for connection to mains supply, reference is made to the national building wiring requirements for the size of the protective earthing conductor.
  7. For permanently connected electrical equipment terminals intended exclusively for connection of the AC mains supply neutral conductor, if any, shall be indicated by the capital letter N. On three-phase equipment, if incorrect phase rotation could cause overheating or other hazard, terminals intended for connection of the AC mains supply line conductors shall be marked in such a way that, in conjunction with any installation instructions, the sequence of phase rotation is unambiguous.
  8. For permanently connected equipment, terminals intended exclusively for connection of a DC mains supply shall be marked to indicate polarity.

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