Juniper T640 Hardware Manual page 201

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Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Switch the circuit breakers on each two-input 160-A DC power supply, three-input
4.
240-A DC power supply, or four-input 240-A DC power supply faceplate to the off
position ( O ) or switch the power switch on each AC power supply or six-input DC
power supply faceplate to the standby position.
T640 Preventing Electrostatic Discharge Damage on page 386
Powering On a DC-Powered T640 Router on page 162
Powering On an AC-Powered T640 Router on page 167
T640 General Electrical Safety Guidelines and Electrical Codes on page 404
Chapter 13: Providing Power to the T640 Router
169