Siemens HiPath 1100, Service Manual

Page: 185 / 389

Service Manual
4-185
Installation
Protective power outage relays
●
For an indoor environment, use a safety ground conductor (PE) with a cross-section larger
than 2.5 mm
2
. For an outdoor environment, use a safety ground conductor (PE) with a
cross-section larger than 4 mm
2
.
●
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 disconnected.
The ground wire connection does not preclude the need to provide functional grounding to the
system using an appropriate power supply circuit (See “Power Systems” on page 2-26)
.
Checking the protective ground connection
Procedure
To ensure a proper grounding connection perform the tests described in the table below before
placing the system in service
.
4.15 Protective power outage relays
Each external analog line on the EB 202/204/206/210 modules features a relay that forwards
the line to the first two extension slots on each EB module in the event of a power outage.
The ground wire must be connected to the protective ground of the building, never
to water pipes, lightning rods, etc.
Step Procedure Result
(Rated Value)
1. Measure the ohmic resistance between the ground
connection and the grounding bar.
< 1 Ohm
2. Measure the ohmic resistance between the network’s
protective earth ground (PE) and the outlet or the
Main Distribution Frame.
< 1 Ohm
3. Measure the ohmic resistance of the outlet’s neutral
conductor in relation to the earth.
< 10 Ohm
Expansion modules EB 200/400/800 do not feature protective relays.