Information On The Protective Conductor Resistance Test - Siemens MOBILETT XP Digital Maintenance Instruction

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2.7

Information on the protective conductor resistance test

Observe the instructions in the "Safety Rules for Installation and Repair"
(ARTD-002.731.17 ...).
The protective conductor resistance must be measured, documented, and evaluated dur-
ing maintenance.
NOTE
The measurement must be performed according to DIN VDE 0751, Part 1 (see ARTD
Part 2). The protective conductor resistance for all touchable conductive parts must be
measured during the normal operating state of the system.
Make sure that control cables or data cables between the components of the system are
not mistaken for protective conductor connections.
During the measurement, move the power cable and additional connection cables with an
integrated protective conductor section by section to detect cable breaks.
The protective conductor resistance must not exceed 0.2 Ohms.
Fig. 1:
Pos. 1
Pos. 2
Pos. 3
MOBILETT XP Digital
For evaluation purposes, the first measured value and the values
documented during maintenance or safety checks must be com-
pared to the measured values. A sudden or unexpected increase
in the measured values may indicate a defect in the protective con-
ductor connections - even if the limit value of 0.2 ohms is not ex-
ceeded. (Protective conductor or contacts).
Measuring circuit for measuring the protective conductor resistance for units that are
disconnected from power, in compliance with DIN VDE 0751-1/2001-10, Fig. C2.
= System
= Application part type B (if available)
= Measurement setup (integrated into measuring device)
SPR8-230.831.30.03.02
11.05
General maintenance information
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