Notes On The Protective Conductor Resistance Test - Siemens SIREMOBIL Iso-C Service Instructions Manual

Prerequisites

Notes 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 after every intervention in the
system.
Documentation of the measured values is normally required only during periodical safety
checks.
If parts / components decisively influencing the protective conductor resistance are repla-
ced (e.g. replacement of the power cable, replacement of the power-up module, replace-
ment of multicore connection cables, which also create the protective conductor
connection between parts of the system (e.g. monitor cable or C-arm cable)), or if protec-
tive conductor connections have been repaired, then the protective conductor resistance
must be measured, documented and assessed.
The measurement must be made according to DIN VDE 0751, Part 1 (see ARTD Part 2).
In this case the protective conductor resistance 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 the mains cable and additional connection cables which also
create the protective conductor connection between parts of the system (e.g. monitor
cable between basic unit and monitor cart) must be moved section by section to detect
broken conductors.
The protective conductor resistance must not exceed 0.2 Ohms.
The values must be recorded and assessed as repeat measurements in the protective
conductor resistance record stating the measuring points.
Fig. 2 Measuring circuit for measuring the protective ground wire resistance for units that are disconnected from power,
in compliance with DIN VDE 0751-1:2001-10, Fig. C2.
1 = System
2 = Applied part (if present)
3 = Measuring arrangement (integrated in measuring instrument)
Siemens AG
Medical Solutions
SPR2-230.061.01
Rev. 13 12.04
Page 7 of 18 SIREMOBIL Iso-C
CS PS 24
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System Manual