SAGEM 3P@C
Figure
Neutral point
Zero wire Live wire
In order to ensure the definitely safe operation of the equipment, grounding in accordance with the grounding treatment requirements is needed. At the upper back of the 3P@C 4450E cabinet, one end of the grounding cable can be fixed and mounted at the grounding terminal while the other end can connect the protection ground of the equipment room, or it can be buried under the ground or connected to the grounding body inside the equipment room. The grounding resistance of the grounding body should be less than 1 ohm and copper conductors with good conductivity should be selected as the grounding cables with the section area no less than 16mm2.
The following grounding requirements are posed for 3P@C 4450E:
The grounding cables should be led into the equipment room by the horizontal grounding busbar of the vertical grounding bus in the joint grounding device. The grounding cable of each rack of the 3P@C 4450E equipment should be led into the nearest horizontal grounding bus.
The DC power supply working ground of each rack in the 3P@C 4450E equipment should be connected from the grounding bus.
Each rack equipment should have the working ground. The shell and cabinet should have the protection ground.
The distribution frame should be connected with the protection ground via the grounding bus. Meanwhile, the distribution frame should not be electrically connected with the cabinet.
All communication equipment in the equipment, except for the grounding cable close to the grounding bus, are not allowed to form the electrical connection by the installed fastening bolts touching the steel reinforcement in the building.
The section area of the grounding cables (including the wires connecting the cabinets to be grounded/the grounding wires with the horizontal grounding busbars) should be determined on the basis of the possible maximum current load. The grounding cables should be made of good conductors (copper) and naked conducting wires are not allowed.
The joint grounding resistance of the communication office where the 3P@C 4450E is located should be less than 2 ohm.
The metal parts (e.g., walls and reinforcing steel bars inside pillars) of the building itself should be preferably used as the downleads of the lightning protection ground, and such downleads shall be electrically connected with one another to balance the electric potential inside the building. The working ground of 3P@C 4450E should be far away from the power equipment or the grounding devices of the lightning protection ground as much as possible.
The grounding terminals must undergo
Do not lay down the grounding cables and signal cables in parallel or in a twisted manner to reduce their mutual interference.
3P@C Installation Manual
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SAGEM SA