NEC UNIVERGE SV8500 Setup Manual page 10

2.2.7 Lightning Strikes
WARNING
2.3 Disposables and Periodic-replacement Parts
ATTENTION
PRODUCT LIABILITY
PL- 8
The grounding system must protect the PBX, MDF, main power source, MAT, printer, modems, etc.
from damage caused by lightning strikes and electrical surges.
All the grounding conductors must have a resistance of less than one Ω to bring a zero-voltage
reference to the system components.
To achieve this, the following ground conductors must connect to the Primary Ground Bar:
• The Earth Ground (E) from the Rectifier
• The Frame Ground (FE) from the PBX
• The Power Ground (PE) from the PBX, through the Rectifier
• The Frame Ground (FE) from the MDF
• The AC service outlets, with AC 100 V plug outlets, for the MAT, printer, modems and any
measurement devices, such as a protocol analyzer.
Many parts, such as fans, batteries, backup batteries, hard disks, fuses and displays need to be
replaced on a periodic basis. In the event of sudden traffic, a part that is past due for replacement
might lead to a system failure and damage to the PBX.
Replace the disposable items such as ink ribbons, printer cartridges, floppy disks, recording paper
and headsets as needed.
A service contract with the dealer or its service technician to monitor the replacement cycles and to
supply the replacement parts and the necessary disposables is recommended.