BS 1852

The British standard BS 1852^[1] and its replacement, BS EN 60062^[2][3], comprises a colour code for fixed resistors; letter and digit code for resistance (R for ohms, K for kilohms and M for megohms) and capacitance values.

Codes

Letter code for resistance and capacitance tolerances and a date code for capacitors and resistors:

coding:

BB - 1/8 WATTS,

CB - 1/4 ″ ,

EB - 1/2 ″ ,

GB - 1/1 ″ ,

5 - ±5% tolerance,

2 - ±20% ″,

1 - ±10% ″,

Steps to find out the resistance or capacitance values:

1. 1st 2 letters gives the power dissipation capacity.
   
2. next 3 digits gives the resistance value.
   
   1. 1st 2 digits are the significant values
      
   2. 3rd digit is the multiplier.
      
3. final digit gives the tolerance.

Examples

If a resistor is coded :

• EB1041: power dissipation capacity = 1/2 watts, resistance value = 10×10^4±10% = 9×10^4 ohms, 11×10^4 ohms.
• CB3932: power dissipation capacity =1/4 watts, resistance value = 39×10^3±20% = 46.8×10^3 ohms, 31.2×10^3 ohms.

References

1. ^ BS 1852:1975, IEC 60062:1974
2. ^ BS EN 60062:1994
3. ^ BS EN 60062:2005