3.2.4 Frame Ground Connection
1.
Loosen the screw.
2.
Insert an grounding wire (user-supplied).
3.
Tighten the screw.
4.
Connect the grounding wire to ground.
A
B
(1)
(1)
To ground
A
Screw
B
Grounding wire
WARNING
•
Proper grounding (connection to ground) is very important to reduce the risk to the user of
electrocution or to protect the PBX from the bad effects of external noise in the case of a lightning
strike.
•
The grounding wire of the AC cable has an effect against external noise and lightning strikes, but
it may not be enough to protect the PBX and to ensure electromagnetic compatibility. A
permanent connection between ground and the ground terminal of the PBX must be made.
CAUTION
For grounding 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.
Notice
Be sure to comply with applicable local regulations (e.g., laws, guidelines).
3.2.5 Installing/Removing the Optional Service Cards
CAUTION
•
Before touching the product (PBX, cards, etc.), discharge static electricity by touching ground or
wearing an grounding strap. Failure to do so may cause the PBX to malfunction due to static
electricity.
•
When installing or removing the optional service cards, the power switch must be turned off, and the
AC power cord must be removed from the AC inlet.
3.2.4 Frame Ground Connection
Getting Started
43
