BS EN 60063:2015 - Preferred number series for resistors and capacitors

BS EN 60063:2015

Preferred number series for resistors and capacitors

Status : Current   Published : June 2015



This International Standard provides series of preferred values for the resistance of resistors and for the capacitance of capacitors.

The definition of such series with a defined numeric resolution is a basic prerequisite for the marking and coding of capacitors and resistors with their respective capacitance or resistance values as described in IEC 60062.


The number series defined in this standard are based on progressive ratios of [Formula removed.], with r = 3 · 2 i , and i being a whole number in the range of 0 to 6, hence e.g. of [Formula removed.] .

This system of progressive ratios had been established prior to the 1952 release of the first edition of this standard 1 as a consequence of the standardisation of tolerances at ±5 %, ±10 % and ±20 % and the related commercial practice. An adoption of the ISO practice, based on a [Formula removed.] system, was never considered achievable.

Standard NumberBS EN 60063:2015
TitlePreferred number series for resistors and capacitors
Publication Date30 June 2015
Normative References(Required to achieve compliance to this standard)IEC 60062, EN 60062
Informative References(Provided for Information)ISO 3
ReplacesBS 2488:1966
International RelationshipsEN 60063:2015,EN 61935-1:2009,IEC 60063:2015
DescriptorsElectrical components, Capacitance, Tolerances (measurement), Fixed capacitors, Resistors, Capacitors, Communication equipment, Preferred numbers, Fixed resistors, Electrical resistance, Electronic equipment and components, Standardized parameters
Title in FrenchSéries de valeurs normales pour résistances et condensateurs
Title in GermanVorzugsreihen für die Nennwerte von Widerständen und Kondensatoren
ISBN978 0 580 84243 6
File Size1.421 MB

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