TS IEC/TR 60364-2-21

TS IEC/TR 60364-2-21 is a technical report that serves as a guide to general terms used in electrical installations of buildings. In practice, it helps align the meaning of core concepts used across building wiring, protection, connection arrangements, and points of use. It should be understood as terminology guidance rather than a standard that directly prescribes installation rules or mandatory test requirements.

Why general terminology matters

Electrical installations in buildings span the path from the incoming supply to final circuits and connected equipment. In that context, terms such as circuit, conductor, protective arrangement, earthing, and isolation need to be used consistently so that designs, specifications, drawings, and maintenance records mean the same thing to everyone involved. This technical report is centered on that shared vocabulary.

What this document covers in technical context

• Its subject is the general terminology for electrical installations of buildings.
• It is a terminology guide and technical report; no specific test method or numerical limit is indicated in the supplied scope.
• The document is based on IEC/TR3 60364-2-21:1993.
• It is a withdrawn document, so it is best treated as a historical terminology reference.

Terminology standards and guides are especially useful where multiple documents and disciplines intersect. In low-voltage building installations, consistent naming of protective measures, conductor types, circuit arrangements, and equipment locations reduces ambiguity and supports clearer technical communication. The value of this document lies in organizing that common technical language.