BS EN 61666:2010+A1:2021

This standard BS EN 61666:2010+A1:2021 Industrial systems, installations and equipment and industrial products. Identification of terminals within a system is classified in these ICS categories:

• 01.080.30 Graphical symbols for use on mechanical engineering and construction drawings, diagrams, plans, maps and in relevant technical product documentation
• 01.080.40 Graphical symbols for use on electrical and electronics engineering drawings, diagrams, charts and in relevant technical product documentation
• 29.120.20 Connecting devices
• 01.080.50 Graphical symbols for use on information technology and telecommunications technical drawings and in relevant technical product documentation

This International Standard establishes general principles for the identification of terminals of objects within a system, applicable to all technical areas (for example mechanical engineering, electrical engineering, construction engineering, process engineering). They can be used for systems based on different technologies or for systems combining several technologies.

Requirements for marking of terminal designations on products are not part of this publication.

NOTE The standard is based on the general principles for the structuring of systems including structuring of the information about systems, established in the International Standard ISO/IEC 81346 series, published jointly by IEC and ISO.