User manual

GMC-I Messtechnik GmbH 23

Measuring Method

The following can be measured, depending upon the measuring

method:

•Time to trip t

: tripping test with nominal residual current I

ΔN

(The PRCD-K must be tripped at 50% nominal current.)

• Tripping current I

: testing with rising residual current I

Select 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

ΔN

Whether or not PRCDs and selective RCDs are of like design can

be tested by measuring contact voltage U

IΔN

. If a contact voltage

IΔN

of greater than 70 V is measured at the PRCD of an other-

wise error-free system, the PRCD more than likely contains 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 electrical tool – and the electrical outlet.

Select Measuring Function

Set Parameter – SRCD / PRCD

Start Measurement

ΔN

Type 1:

ΔN

Type 1: