Lub IEC (International Electrotechnical Commission) tus qauv uas hais txog Kev Xeem Tsawg Tsawg (VLF) yog IEC 60502-2. IEC 60502-2 yog ib feem ntawm IEC 60502 series, uas muab cov lus qhia tshwj xeeb rau cov fais fab cables nrog extruded rwb thaiv tsev thiab lawv cov khoom siv rau cov ntsuas hluav taws xob ntawm 1 kV (kilo-volts) txog 30 kV.
IEC 60502-2 tshwj xeeb tsom rau "Hwj chim cables nrog extruded rwb thaiv tsev thiab lawv cov khoom siv rau cov ntsuas hluav taws xob ntawm 1 kV (Um=1,2 kV) txog 30 kV (Um=36 kV)) - Ntu 2: Cables rau cov ntsuas hluav taws xob ntawm 6 kV (Um=7, 2 kV) txog 30 kV (Um=36 kV).
Cov qauv no suav nrog cov lus qhia thiab cov kev cai rau kev sim cov cables nrog extruded rwb thaiv tsev, thiab nws npog ntau yam xws li kev tsim kho, qhov ntev, cov khoom siv, thiab cov txheej txheem kuaj. Kev ntsuam xyuas VLF feem ntau yog hais txog nyob rau hauv cov ntsiab lus ntawm kev ntsuam xyuas cable rwb thaiv tsev raws li IEC 60502-2.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov qauv yuav raug hloov kho thiab hloov kho, thiab tej zaum yuav muaj cov qauv tshiab lossis hloov kho rau IEC cov qauv raws sij hawm. Yog li, nws raug nquahu kom kuaj xyuas cov qauv tshiab ntawm IEC cov qauv lossis sab laj nrog cov tub ceev xwm rau cov ntaub ntawv tam sim no.