Siemens Hicom 150 E Office - Checking the Protective Earth; Connecting the Cables

Figure 4-9 Hicom 150 E OfficePro - protective earthing option 2
4.1.8 Checking the protective earth
Procedure
The tests listed in the table below should be carried out before system start-up to ensure that the
system is properly earthed.
Step Action Result (target)
1. Measure the ohmic resistance of the earth connection between the earth bus
and the system.
< 1 ohm
2. Measure the ohmic resistance of the earth connection between the PE of the
AC power cable and the metal frames of the cabinet(s).
< 1 ohm
3. Measure the ohmic resistance to earth from the PEN conductor of the socket
used.
< 10 ohms
4.1.9 Connecting the cables
Introduction
All cables that leave the cabinet must be attached to the ventilation grill of the metal back
panel by means of cable straps.
Set up the connection between the MDFU/MDFU-E and the system via CABLUs (cabling units
prefabricated in the factory) that have the following layouts:
System side: SIPAC 1 SU connector
Cable: 16 x 2 x 0.4 (the standard cable length is 2 m.)
Hicom 150 E Office Rel.1.0 Service Manual - 4 Installation
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