Test and Tag Supplies have recently added the Kyoritsu 4120A loop impedance meter to their product range. This convenient test instrument is capable of measuring fault loop impedance within the wiring circuit directly at the power outlet.
One of the significant features of this model is the D-Lok circuit that permits loop impedance testing without tripping some types of RCD installed in the circuit being loop tested. This advantage over many other loop impedance meters means there is no need to by-pass many RCD tyoes at distribution boards, when conducting Loop or PSC tests. The 4120A also allows direct reading of the PSC (prospective short circuit current).
The Kyoritsu 4120A loop impedance meter offers high accuracy and reliability, 3 LEDS for checking correct wiring status, safe voltage measurement function and large custom digital display read out. It is able to measure low loop resistance to a resolution of 0.01ohms.
The Kyoritsu 4120A loop impedance meter has automatic lock-out if test resister overheats. The loop impedance meter also has a visual indication of reversed phase and neutral wiring t socket. The Kyoritsu 4120A loop impedance meter is designed to IP54 rating and complies with IEC61557.
Loop impedance measurement is important in preventing accidents caused by the earth leakage breaker and other protection devices to becoming inoperative. This occurs when the earth circuit is overloaded or shorted and sufficient current does into flow into the circuit where the loop impedance is too high.