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Grounding method
To prevent ground loops, power all chassis from the same dedicated
power panel. Ground all Main Chassis to the power panel through the
grounding block. Ground the Chassis Expander to the Main Chassis.
The method of grounding used for the Option 11C Mini depends on whether
the same service panel powers all chassis.
The following three grounding scenarios are possible:
1
A system with one chassis
2
A system with more than one chassis, powered by the same service panel
3
A system with more than one chassis, powered by different service
panels
A system with one chassis or multiple chassis powered by one
service panel
For each Main Chassis, connect a #6 AWG (#40 Metric Wire Gauge) ground
wire from the chassis to the NTBK80 grounding block. See Table 10 on
page 49 for grounding wire requirements specific to some areas. Connect the
grounding block to a ground source (the ground bus in the AC power service
panel).
Consider the Main Chassis and the Chassis Expander as the same ground.
Jumper the ground wire from the Chassis Expander to the Main Chassis and
then back to the grounding block.
Chapter 3 — System and site requirements
CAUTION
Option 11C Mini
Page 53 of 332
Planning and Installation Guide
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