Installation Manual 28 Document #: LTRT-59811
MediaPack Series
The MP-124 chassis is equipped with a protective earthing screw. Ensure that you connect
this to the grounding point using a suitable wire. Fasten the cable securely using a 6-32
UNC screw.
Note: Proper grounding is crucial to ensure the effectiveness of the primary protection
devices against power surges. Therefore, both the primary protector and the MP-124 must
be connected to the equipotential ground bus (in electrical switch board) that is connected
directly to the grounding of the foundation reinforcement conductor.
Before installation, loop-testing grounding measurements must be done by a certified
electrician to verify the quality of the grounding connection. The grounding impedance must
not exceed 0.5 ohm.
The figure below illustrates the connection method for grounding and lightning protector.
Figure 2-18: Grounding and Power Surge Protection
Telephone Lines
Outside Building
Main Distribution Frame (MDF)
To Foundation
Reinforcement/Ring Conductor (Ground)
Tip
Ring
26 AWG
MP-124
Equipment Rack
Telecommunication Room
MP-124
Stranded
Wire
10 mm
2
50-Pin Telco for
Telephone Lines
Stranded Wire
6 mm
2
Equipotential
Ground Bus Bar
Primary Lightning
Protection (CIRCA)
Equipotential Ground Bus
in Electrical Board
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