Checking The Protective Earth; Connecting The Cables - Siemens Hicom 150 E Office Service Manual

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Hicom 150 E Office Rel.1.0 Service Manual - 4 Installation

Figure 4-9 Hicom 150 E OfficePro - protective earthing option 2

4.1.8 Checking the protective earth

The tests listed in the table below should be carried out before system start-up to ensure that the

system is properly earthed.

Measure the ohmic resistance of the earth connection between the earth bus

and the system.

Measure the ohmic resistance of the earth connection between the PE of the

AC power cable and the metal frames of the cabinet(s).

Measure the ohmic resistance to earth from the PEN conductor of the socket

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.)

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