Requirements 1 - 5
Siemens AG RXB8-115.034.02 Page 5 of 8 POLYMOBIL III
Medical Solutions Rev. 03 04.05 CS PS 24
Repeat measurement
In the case of maintenance or repair perform the protective conductor resistance mea-
surement again.
Document and assess the values determined in the repeat measurement.
The measurement must be made according to DIN VDE 0751, Part 1
(see ARTD-002.731.17...). In this case the protective conductor resistance in the normal
operating condition to all conductive touchable parts of the system must be measured.
Make sure that control cables or data cables between the components of the system do
not imitate any protective conductor connection.
During the measurement, move the power cable and additional connection cables with
integrated protective conductor section by section to detect cable breaks.
The protective conductor resistance must not exceed 0.2 Ohms.
The values determined in the repeat measurement must be recorded and assessed in the
report ’Protective conductor resistance / report’, stating the measuring points.
Document the measuring procedure and the measuring instrument used (designation
and serial number).
Fig. 1 Measuring circuit for measuring the protective conductor resistance in systems that are separated from the
power supply, according to DIN VDE 0751-1:2001-10, Fig. C2.
1 = System
2 = Application part (not present)
3 = Measuring arrangement (integrated in the measuring instrument)
Evaluate the results by comparing the first measured value to the
corresponding values documented during preceding mainte-
nance procedures or safety checks.
A sudden or unexpected increase of the measured values
may indicate a safety-relevant defect
- even if the limit value of 0.2 ohms is not exceeded
(protective ground wire or contacts).
NOTE
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