BS EN IEC 60773:2021

What is BS EN IEC 60773 about?  

BS EN IEC 60773 discusses about operational characteristics of brushes. BS EN IEC 60773 applies to test methods for the measurement of the operational characteristics of brushes designed to operate on commutating and slip ring machines under specified test conditions. 

BS EN IEC 60773 gives idea about symbols used, provides test rig specifications for commutators and slip rings, test schedule and operating conditions, determination of friction co-efficient, determination of voltage drop and brush wear, environmental conditions, and many other technical specifications for rings, brushes, and brush holders operating on commutating and slip ring machines. 

Note 1: By extension, some tests may be relevant for other kinds of sliding electrical contacts for electrical appliances. 

Who is BS EN IEC 60773 for? 

BS EN IEC 60773  on rotating electrical machines is useful for: 

• Designers and manufacturers of rotating electrical machines 
• Manufacturers and suppliers of brushes for rotating machines 
• Manufacturers and suppliers of components for rotating machines 

Why should you use BS EN IEC 60773?  

Slip rings consist of a stationary graphite or metal contact brush that rubs on the outside diameter of a rotating metal ring. As the metal ring turns, electrical current runs through the stationary brush to the metal ring making the connection. 

BS EN IEC 60773  on rotating electrical machines is dedicated to brushes mounted on commutators and slip ring machines and gives you all the detailed information about technical specifications, test methods, apparatus and operational conditions for brushes and brush holders, so that you can design and construct suitable brushes for a particular electrical rotating machine.  

Also, BS EN IEC 60773 helps you to manufacture brushes and rings such that they are reliable and of great calibre, ensuring safe working and reduced risks while operating under certain conditions. 

What’s changed since the last update?  

BS EN IEC 60773:2021 cancels and replaces the first edition published in 1983 that constitutes a technical revision. BS EN IEC 60773:2021 includes the following significant technical changes with respect to the previous edition: 

• The clause structure has been modified on the view point of a laboratory testing procedure. The new sequence is as follows: test rig specification (Clause 4), general testing procedure (Clause 5), and specific procedure for each operational characteristic (Clauses 6 to 8). 
• A new Clause 9 has been added to introduce the black-band test for the characterisation of the brush grades for DC machines.