What Is a Fixed Electrical Equipment?

The term ‘fixed equipment’ is officially defined within the IEC 60050-826-2022 as:

electric equipment fastened to a support or otherwise secured in a specific location.

IEC 60050-826-2022

Note 1 to entry: Equipment that has a screw hole or other means to secure the equipment by an ordinary person, such as for securement to a table or for earthquake protection, is not considered to be fixed equipment.

Note 2 to entry: Typically, fixed equipment will be wall, ceiling or floor mounted.

IEC 62599-1 defines the term more fully:

equipment fastened to a support or otherwise secured in a specific location, or equipment not provided with a carrying handle and having such a mass that it cannot easily be moved. (e.g. an intruder alarm system control panel screwed to the wall).

IEC 62599-1-2010

The British Standard BS 7671 defined the term “fixed equipment” as follows:

Equipment designed to be fastened to a support or otherwise secured in a specific location.

BS 7671:2018+A2:2022

The definition provided is similar to the definition of this term in IEC 60050-826-2022.

According to the above definitions, fixed electrical equipment is installed in certain areas of the electrical installation of a building and securely fastened there, because during its operation this electrical equipment must be stationary.

Various electrical equipment is used in the electrical installations of buildings, which must be fixed in a certain place during its operation. Fixed electrical equipment is usually fastened to the foundations, floors, walls, and ceilings of the building. It can also be placed inside floors, walls, ceilings, and other building structures.

Fixed electrical equipment is usually permanently connected electrical equipment that is connected to the electrical circuits of the electrical installation of a building by terminals or other means requiring the use of tools. However, plugs can also be used to connect such electrical equipment.

Examples of Fixed Electrical Equipment

Fixed electrical equipment includes low-voltage switchgear, electric motors of water supply, heating, firefighting, smoke removal systems installed in the building, wires, and cables of stationary electrical wiring, most lighting fixtures, washing machines, air conditioners, electric water heaters, heating cables, etc.

Light on the ceiling - an example of fixed electrical equipment
Luminaire on the ceiling – an example of fixed electrical equipment

Main Requirements

1. Where arcs, sparks or particles at high temperature may be emitted by fixed equipment in normal service, the equipment shall meet one or more of the following requirements. It shall be:

– totally enclosed in arc-resistant material

– screened by arc-resistant material from materials upon which the emissions could have harmful effects

– mounted so as to allow safe extinction of the emissions at a sufficient distance from materials upon which the emissions could have harmful effects

– in compliance with its standard.

Note: Arc-resistant material used for this protective measure shall be non-ignitable, of low thermal conductivity and of adequate thickness to provide mechanical stability.

2. Fixed electrical equipment shall be selected and erected such that its temperature in normal operation will not cause a fire. This shall be achieved by the construction of the equipment or by additional protective measures taken during erection.

3. Where fixed electrical equipment may attain surface temperatures which could cause a fire hazard to adjacent materials, one or more of the following installation methods shall be adopted. The equipment shall:

– be mounted on a support which has low thermal conductance or within an enclosure which will withstand, with minimal risk of fire or harmful thermal effect, such temperatures as may be generated, or

– be screened by materials of low thermal conductance which can withstand, with minimal risk of fire or harmful thermal effect, the heat emitted by the electrical equipment, or

– be mounted so as to allow safe dissipation of heat and at a sufficient distance from adjacent material on which such temperatures could have deleterious effects. Any means of support shall be of low thermal conductance.

4. Fixed electrical equipment causing a concentration and focusing of heat shall be at a sufficient distance from any fixed object or building element so that the object or element is not subjected to a dangerous temperature in normal conditions.

5. The designer of the fixed installation shall verify that the installed fixed equipment, where relevant, is designed and manufactured in accordance with EMC Directive 20 14/30/EU and, upon request, the responsible person for the fixed installation shall provide the required documentation as specified by EMC Directive 20 14/30/EU.

6. Fixed electrical equipment intended to be floor-standing on a non-combustible surface does not require a fire enclosure bottom. Such equipment shall be marked in accordance with Clause F.5 IEC 62368-1.

7. Supplementary protective equipotential bonding shall include all simultaneously accessible exposed-conductive-parts of fixed equipment and extraneous-conductive-parts including where practicable the main metallic reinforcement of constructional reinforced concrete. The equipotential bonding system shall be connected to the protective conductors of all equipment including those of socket-outlets.

References

  1. IEC 60050-826-2022
  2. BS 7671:2018+A2:2022
  3. IEC 62368-1-2018

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