Loop 3-Wire L-PE with RCDDesignationTest CurrentApplicationRCD15 mAFor circuits protected by an RCD rated <= 30 mARDC EV3 mAFor EV charger circuits protected by a RDC and a Type A RCD rated <= 30 mAFunctionRangeAccuracy0.01 Ω - 9.99 Ω±2% ±5 digits10.0 Ω - 199 9 Ω±10% ±5 digitsSupply Voltage48 V – 280 VSupply Frequency45 Hz – 65 HzNote: Uses the Megger Confidence Meter to measure the supply source impedance of circuits protected with an RCD when three connections are possible. The L-N Loop resistance needs to be less than 12 Ω. The resistances of the L-PE, L-N and N-PE loops are all shown, and the accuracy of the L-PE resistance depends on the maximum resistance displayed. When the neutral is not available the two-wire test must be used. Note: RCD may trip if there are high leakage currents in the circuit under test. This measurement is immune to the effect of inductance found in some RCDs as it measures resistance.EN61557-3 Measurement Range: 1.00 Ω to 1999 ΩRCD TestsTypes A and ACRCD TypesAC, A, AC(S), A(S)RCD Rated Current (IΔn)10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 650 mA, 1000 mA, VAR½ I no-trip Test Current-10% – +0% 0.5 IΔn1 I, 2 I, 5 I trip test – AC current-0% – +10% M • IΔn1 I, 2 I, 5 I trip test – pulsed DC current-0% – +10% 1.4 • M • IΔnTrip time±1% ±1 msRamp trip test current± 5%Fault Voltage (0 V – supply)+5% +15% ±0.5 VSupply Voltage48 V – 280 VSupply Frequency45 Hz – 65 HzType BRCD TypesB, B(S)RCD Rated Current (IΔn)10 mA, 30 mA, 100 mA, 300 mA½ I no-trip Test Current-10% – +0% (0.5 IΔn)1 I, 2 I, 5 I trip test Current-0% – +10% (2 IΔn)Trip time±1% ±1 msTrip current (ramp)± 5%Fault Voltage (0 V – supply)+5% +15% ±0.5 VSupply Voltage48 V – 280 VSupply Frequency45 Hz – 65 HzMFT-X1Multifunction testerwww.megger.com 7
