User Manual

GMC-I Messtechnik GmbH 23
Measuring Method
The following can be measured, depending upon the measuring
method:
•Time to trip t
A
: tripping test with nominal residual current I
∆N
(the PRCD-K must be tripped at 50% nominal current).
• Tripping current I
∆
for testing with rising residual current I
F
Select the Measuring Function
Connection
Set the Parameter – PRCD with Non-Linear Elements
Start Measurement
7.3.3 SRCD, PRCD-S (SCHUKOMAT, SIDOS or comparable)
RCCBs from the SCHUKOMAT SIDOS series, as well as others
which are of identical electrical design, must be tested after
selecting the corresponding parameter.
Monitoring of the PE conductor is performed for RCDs of this
type. The PE conductor is monitored by the summation current
transformer. If residual current flows from L to PE, tripping current
is cut in half, i.e. the RCCB must be tripped at 50% nominal resid-
ual current I
∆N
.
Whether or not PRCDs and selective RCDs are of like design can
be tested by means of the touch voltage U
I∆N
measurement. If a
touch voltage U
I∆N
of greater than 70 V is measured at the PRCD
of an otherwise error-free system, the PRCD more than likely con-
tains a non-linear element.
PRCD-S
The PRCD-S (portable residual current device – safety) is a spe-
cial, portable protective device with protective conductor detec-
tion or protective conductor monitoring. The device serves to pro-
tect persons from electrical accidents in the low-voltage range
(130 to 1000 V). The PRCD-S must be suitable for commercial
use, and is installed like an extension cable between an electrical
consumer – as a rule an electric tool – and the electric outlet.
Select the Measuring Function
Set Parameter – SRCD / PRCD
Start Measurement
I
∆N
Or
I
F
Type 1:
I
∆N
Or
I
F
Type 1: