TelcoBridges 7800 N+1, Руководство по установке

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TMG7800 Series System Installation Guide
40
4.5 Grounding the Equipment Chassis
As a standard safety practice, the chassis of the 7800 Telecom unit must be properly grounded to
protect against any contact with an electrical fault condition. It is recommended that the chassis be
connected to earth ground. When the 7800 Telecom unit is installed in an equipment rack, connect the
ground wire between the ground lug of the Telecom unit and the equipment rack ground bar.
Guidelines
• Use 10 AWG (minimum) stranded ground wire.
• Terminate equipment side of ground wire with a #10 ring terminal.
• Keep the length of the ground wire as short as possible.
• Do NOT daisy chain the ground between equipment. Use a ground bus bar, as show in figure 4.12
on page 40.
• Do not over tighten ground lug connections.
To connect the 7800 Telecom unit to ground:
1. Connect one end of a ground wire to the ground lug of the 7800 Telecom unit. See figure 4.12 on
page 40.
2. Connect the other end of the ground wire to a ground bar of the equipment rack. If the 7800
Telecom unit is not installed in an equipment rack, connect the ground wire to earth ground.
3. Verify that the resistance of the ground path is less than 0.5 ohms.
Figure 4.12 Chassis Ground Connection
MGMT0
ETH VOIP
0 1 0 1
TMS
0 1
Ground Bar
MGMT0
ETH
VOIP
0 1 0 1
TMS
0 1
Earth
Ground
DC Unit
Earth
Ground
AC Unit
(or)