L
N
Measurement of earth (PE) leakage current
L
N
L1
L2
L3
L1
L2
L3
N
Figure 2, 3 and 4: Differential Method
Measurement of differential leakage current
Load
PE
Figure 1: Direct Method
1ø2W
Figure 2
3ø3W
Figure 3
3ø4W
Figure 4
9
Load
PE
Load
PE
Load
PE