2.2.10 Frame Earth Connection
1. Loosen the screw.
2. Insert an earthing wire (user-supplied).
3. Tighten the screw.
4. Connect the earthing wire to earth.
5. Repeat steps 1 to 4 for each shelf.
WARNING
Proper earthing (connection to earth) is very important to protect the PBX from the bad effects of
external noise or to reduce the risk to the user of electrocution in the case of a lightning strike.
CAUTION
• Make sure to separately connect the frame of each shelf to a different earth terminal. Do not connect
it to other shelves.
• For earthing wire,
green-and-yellow insulation is required, and the cross-sectional area of the conductor
must be more than 0.75 mm
2
or 18 AWG.
• The earthing wire of the AC cable has an effect against external noise and lightning strikes, but it may
not be enough to protect the PBX. A permanent connection between earth and the earth terminal of
the PBX must be made.
Notice
Be sure to comply with applicable local regulations (e.g., laws, guidelines).
106 Installation Manual
2.2.10 Frame Earth Connection
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