IEC 60276-2018 pdf free.Carbon brushes, brush holders, commutators and slip-rings – Definitions and nomencl ature.
This document applies to carbon brushes for electrical machinery. For the present, it applies only to carbon brushes for commutators and slip-rings in rotating machines.
Terms and definitions are relative to the brush construction (references 100’s to 500’s and parts of 900’s) and to the markings when operating on a rotating machine (references 600’s to 800’s).
By extension, terms and definitions may be relevant for any kind of sliding electrical contacts for electrical machinery.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60136. Dimensions of brushes and brush-holders for electrical machinery
IEC 60773, Test methods and apparatus for measurement of the operational characteristics of brushes
3 Terms and definitions
For the purposes or this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http:l/www.electropedia.orgl
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Brushes are classified according to the class of grade used, as follows.
grade brush material used for the brush body, defined by its composition and its physical properties
3.2 carbon consists of various forms of amorphous carbon, generally made of a mixture of carbonaceous powders agglomerated with a binder, moulded and baked at suitable temperature to carbonize the binder
3.3 carbon-graphite carbog rap h Iti c CG consists of a mixture of powdered amorphous carbon and graphite, agglomerated with a binder (pitch or resin), moulded and baked at suitable temperature to carbonize the binder
3.4 electrographite electrographitic EG Consists of various forms of amorphous carbon (hard carbon or carbon-graphite) converted during manufacture into artificial I synthetic graphite
3.5 natural-graphite NG carbon-graphite grade consisting principally of natural graphite
Note 1 to entry: Sometimes also called soft graphite.
3.6 resIn-bonded bakelite-graphite BG consists of powdered carbon and!or graphite bonded with a resin (artificial, synthetic or natural) and polymerized at suitable temperature
3.7 metal-graphite metallographitic MG consists of a mixture of powdered metals and graphite pressed and baked at suitable temperature
Note I to entry: Baking is named sintering when a reducing atmosphere is used during baking.
3.8 metal-Impregnated M consists of carbon, carbon-graphite or electrographite which contains a metal which has been added by an impregnation process.
Metal can be added by:
— melting the metal and impregnating under pressure, or
— impregnating with a metal precursor and decomposition of this precursor during a further baking operation, or
— deposition in vapour phase.IEC 60276 pdf free download.