This part of IEC 61557 defines special performance requirements for hand-held and handmanipulated
current clamps and sensors for measurement of leakage currents in electrical
distribution systems up to 1 000 V a.c. and 1 500 V d.c., taking into account the influence of
high external low-frequency magnetic fields and other influencing quantities. This standard
does not apply to current clamps or sensors which are used in combination with devices for
insulation fault location according to IEC 61557-9, unless it is specified by the manufacturer.