Safety requirements for electrical equipment for measurement, control and laboratory use - General requirements

Safety requirements for electrical equipment for measurement, control and laboratory use - General requirements

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1   Scope and object

1.1   Scope

This International Standard specifies general safety requirements for electrical equipment intended for professional, industrial process, and educational use, including equipment and computing devices for:
  • — measurement and test;
  • — control;
  • — laboratory use;
  • — accessories intended for use with the above (e.g. sample handling equipment).
This Part 1 of the standard applies to the equipment defined in a) to c) below, when used under the environmental conditions of 1.4.
  1. a) Electrical measurement and test equipment
    This is equipment which by electrical means measures, indicates or records one or more electrical or non-electrical quantities, also non-measuring equipment such as signal generators, measurement standards, power supplies, transducers, transmitters, etc.

    NOTE All indicating and recording electrical measuring instruments (except those excluded in 1.1.2) fall within the scope of this standard unless they are panel meters designed only for building-in to other equipment. Built-in panel meters are considered as components and only need to meet the relevant requirements of IEC 1010, or other standards, as part of the equipment into which they are built.

  2. b) Electrical control equipment
    This is equipment which controls one or more output quantities to specific values, with each value determined by manual setting, by local or remote programming, or by one or more input variables.
  3. c) Electrical laboratory equipment
    This is equipment which measures, indicates, monitors or analyses substances, or is used to prepare materials.
    This equipment may also be used in areas other than laboratories.

1.1.1   Aspects excluded from, scope

This Part 1 of the standard does not cover:
  • — reliable function, performance or other properties of the equipment;
  • — effectiveness of transport packaging;
  • — servicing (repair);
  • — protection of servicing (repair) personnel.

NOTE Servicing personnel are expected to be reasonably careful in dealing with obvious hazards, but the design should protect against mishap by the use of warning labels, shields for hazardous voltage terminals, segregation of low-voltage circuits from hazardous voltages, etc. More important, servicing personnel should be trained against unexpected hazards.

1.1.2   Equipment excluded from scope

This Part 1 does not apply to:
  • — electric power equipment, for example, power electronics;
  • — machine tools and their controls (see IEC 204);
  • — Class 0,5; 1 and 2 alternating current watt-hour meters (see IEC 521);
  • — medical electrical equipment within the scope of IEC 601;
  • — biological amplifiers which link humans to equipment in research or teaching contexts;
  • — type-tested and partially type-tested assemblies of low-voltage switchgear and controlgear (see IEC 439-1);
  • — circuits and equipment which are part of the building electrical installation (see IEC 364);
  • — computers, processors and similar equipment, except as specified in 1.1.3 (see IEC 950);
  • — transformers separate from the equipment (see IEC 742);
  • — equipment intended for household use (see IEC 335);
  • — equipment intended for use in explosive gas atmospheres (see IEC 79).

1.1.3   Computing equipment

This Part 1 applies only to computers, processors, etc., which form part of equipment within the scope of this standard or are designed for use exclusively with the equipment.

NOTE Computing devices and similar equipment within the scope of IEC 950 and complying with its requirements are considered to be suitable for use with equipment within the scope of this Part 1. However, some of the requirements of IEC 950 for resistance to moisture and liquids are less stringent than those in this standard. Where hazards from moisture or liquids could affect equipment which complies with IEC 950 and is used with equipment which complies with this standard, the instructions for use should specify any additional precautions required.