General Scope and object This part of IEC 1270 applies to capacitors for microwave ovens operating at rated a.c. voltages of up to 3 000 V and a superimposed d.c. voltage of up to 0@8. root 2 times the value of rated a.c. voltage. This standard relates specifically to capacitors with a metal case and an upper rated maximum temperature of up to 100 ?? non-self-healing@ with metal foil electrodes and dielectrics of paper and/or plastic@ impregnated with a suitable oil. The object of this standard is: a) to formulate uniform rules regarding performance@ testing and rating; b) to formulate specific safety rules.