Juniper EX4400 - Page 172

To meet safety and electromagnec interference (EMI) requirements and to ensure
proper operaon, you must connect the chassis to earth ground before you connect it
to power (see "Connect Earth Ground to an EX4400 Switch" on page 162).
• Ensure that you provide an external cered circuit breaker (2-pole circuit breaker based on your
device current rang) rated minimum 13 A, 16 A, or 20 A in the building installaon or as per local
electrical code.
We ship the EX4400 switches with one power supply preinstalled on the rear panel. Each power supply
is a hot-removable and hot-insertable eld-replaceable unit (FRU) when the second power supply is
installed and running: You can remove and replace either one of them without powering o the switch
or disrupng switch funcons.
To connect power to an EX4400 switch with an AC power supply:
1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end
of the strap to a site ESD point.
2. Ensure that the power supplies are fully inserted in the chassis.
3. Locate the power cord or cords shipped with the switch; the cords have plugs appropriate for your
geographical locaon.
WARNING: Ensure that the power cord does not block access to device
components or drape where people can trip on it.
4. Push the end of the retainer strip into the hole below the inlet on the power supply faceplate unl
it snaps into place. Ensure that the loop in the retainer strip points upward (see Figure 100 on page
164).
Figure 100: Connect Retainer Strip
164