39
Practical example of RCD test with distribution leads.
10.2 Principles of Uc Measurement
Ground being imperfect in the Fig35, when R exists, when a fault current flows to R, electric
potential occurs. There is a possibility the person contacting in this imperfect ground, it calls
the voltage, which it occurs in the human body of this time, called Uc.
When with the Uc Test letting flow IΔN to the RCD, the Uc is calculated.
Uc voltage is calculated based on the Rated Residual Current (IΔN) with the impedance
measured.
10.3 Operating Instructions for RCD
10.3.1 Initial Checks: to be carried out before any testing;
1. Preparation
Always inspect your test instrument and lead accessories for abnormality or damage:
If abnormal conditions exist DO NOT PROCEED WITH TESTING. Have the instrument
checked by your distributor.
Operation of Function Switch
F1 Measurement mode setting
(X1/2, X1, X5, Ramp, Auto,Uc)
F2 IΔn setting
F3 RCD Type setting ( , , , )
× 1
2
ms
30 mA
L-PE
UL50
V
: 0
°
230V
50.0Hz
L-PE
L-N
!
F4 PHASE setting (0
o
,180
o
)
1. Operate the Power button and turn on the instrument.
Turn the rotary switch and select the RCD function.
Fig.38
S
S
Fig.37
PE
×1
m s
30 m A
230V
L-PE
UL50
V
: 0
°
50.0Hz
L-P E
L-N
!
