BS 9114 N001:1973

Resistance range: values selected from the E 24 series (BS 2488) are listed in BS 9002. Selection tolerances: ≠5 per cent, ≠2 per cent, ≠1 per cent; climatic category: 55/200/56. Temperature characteristic of resistance (+20°C to +70°C): ≠1 per cent for 10 ohms and above, ≠2 per cent for 5 ohms to 10 ohms (not specified below 5 ohms). A range of four case sizes depending upon rated dissipation.