20 General start-up information
MOBILETT XP Digital SPR8-230.814.30.03.02 Siemens AG
11.05 CS SD 24
Page 20 of 70
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Information on the protective conductor resistance test 0
Observe the instructions in the "Safety Rules for Installation and Repair"
(ARTD-002.731.17 ...).
The protective conductor resistance of 0.2 ohms must not be exceeded.
Initial measurement
Perform the protective conductor test after completion of all work.
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.
The values must be recorded as initial measurements, and the measuring points noted, in
the protective conductor resistance report.
The measuring procedure and the measuring device used (designation and serial num-
ber) must also be documented.
Fig. 6: 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.
Pos. 1 = System
Pos. 2 = Application part type B (if available)
Pos. 3 = Measurement setup (integrated into measuring device)
Repeat measurement
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