This standard is applicable to single-turn rotary power potentiometers wire-wound technology. Enamelled, cemented, moulded, enclosed. This specification is applicable to rotary potentiometers with nominal dissipation in excess of 10 Watts, the resistive element of which consists of a wire or a wound tape. All the potentiometers prescribed by this specification are slider-driven without reduction. Their stroke less than 360° is limited by stops. This part of IEC 60393-4 prescribes preferred ratings and characteristics and selects from IEC 60393-1, appropriate quality assessment procedures, tests and measuring methods. It provides general performance requirements for this type of potentiometer. This standard gives the minimum performance requirements and test severities.