Connecting A Safety Ground Wire - Siemens hipath 1100 Service Manual

Installation
Recommendations concerning the Power Supply and Protection of the System

4.12.2 Connecting a Safety Ground Wire

For the safety of the user and the technician the HiPath 1190 system has a dedicated
terminal for grounding its metal enclosure. This terminal is located on the back of the
enclosure. Connecting a ground wire protects the accessible metal parts of the
equipment against high voltage and power levels in the event of a surge or a failure.
The ground connection is critical and must be wired before connecting the system to
a power grid or a telecommunications network (internal or external). To make this
connection follow these guidelines:
For an indoor environment, use a safety ground conductor (PE) with a cross-sec-
●
tion larger than 2.5 mm
ductor (PE) with a cross-section larger than 4 mm
The wire insulation should be color-coded yellow and green.
●
The grounding system's impedance must not exceed 10 Ohms.
●
When uninstalling the system, the safety ground wire (PE) should be the last one dis-
connected.
The ground wire connection does not preclude the need to provide functional ground-
ing to the system by means of an appropriate power supply circuit (see"Power Sys-
tems" on page 2-1).
The ground wire must be connected to the protective ground of the building, never
to water pipes, lightning rods, etc.
Checking the Safety Ground Connection
Procedure
To ensure proper grounding connection perform the tests described in the table be-
low before powering up and initializing the systems.
Step
1.
2.
3.
4-44
2
. For an outdoor environment, use a safety ground con-
Procedure
Measure the Ohmic Resistance between the
ground connection and the grounding bar.
Measure the ohmic resistance between the
network's protective earth ground (PE) and the
outlet or the Main Distribution Frame.
Measure the ohmic resistance of the outlet's
neutral conductor in relation to the earth.
For internal distribution only
2
.
Result
(Rated Value)
< 1 Ohm
< 1 Ohm
< 10 Ohm
A31003-K1250-S100-12-7619
HiPath 1100, Service Manual