graphic symbols used in wiring diagrams (according to CEN standards)

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contacts and switches

select switches

control units



indicators and appliances

electrical standardisation

In each country, electrical equipment is governed by a range of standards including :

  • UTE (Union technique des electricians = Technical Electricians Union) in France;
  • CEN (Comité européen de normalisation = European standardization committee);
  • IEC (International Electrotechnical Commission) or CEI (Commission électrotechnique internationale);
  • VDE (Verband Deutscher Electro‑techniker Germany);
  • BS (British Standards);
  • CEI (Comitato Elettrotecnico Italiano);
  • NEMA (National Electrical Manufacturers Association);
  • ANSI (American National Standards Institute).

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