Ciena CN 3960, Hardware Installation Manual, Page: 15 / 72

CN 3960 Hardware Installation Guide
11
O
VERVIEW
H
ARDWARE
O
VERVIEW
1
Grounding
The CN 3960 is connected to ground at the power supplies and the chassis.
Power supply grounding
The safety ground connection is provided by the AC power cord or by the grounding
terminal on the DC power supply. Further details are provided in:
•
the
Installing an AC Power Supply section on page 27
•
the
Installing a DC Power Supply section on page 29
WARNING: The AC version relies on the AC power cord for the Safety Ground. The outlet
providing power to the CN 3960 must meet the Local and National Safety codes.
WARNING: The DC version relies on the connector at the back of the power supply to
provide Safety Ground. This grounding connection must be properly attached when the
CN 3960 is installed.
Supplemental ground
There are two holes and screws located on the left side of the back of the chassis for
connecting a grounding lug to the chassis. See the
Installing Supplemental Ground
section on page 25 for a procedure.
The grounding screws are provided and are located on the far left of the rear of the
chassis. See Figure 1-3: Rear of CN 3960, on page 7 for the location of the grounding
screws.
You are required to provide the grounding lug and grounding wire. The following
description indicates the required specifications:
•
#6 AWG (minimum) wire
•
2 hole lug @ 5/8” centers and with hole size for #10 or 1/4” screw
The ground source should be connected in accordance with local and national regulations
and safety guidelines, and the grounding procedures used by your company.
The DC resistance between the chassis and the supplemental ground source should be
verified to be less than 25 milliohms.
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