Juniper EX4400 - Page 174

CAUTION: Before you connect power to the switch, a licensed electrician must aach
a cable lug to the grounding cable that you supply. A cable with an incorrectly aached
lug can damage the switch (for example, by causing a short circuit).
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 have the following parts and tools available:
• DC power source cord with a connector (CBL-JNP-PWR-DSUB)—provided
• Number 2 Phillips (+) screwdriver—not provided
• An ESD grounding strap—not provided
We ship the EX4400 switches with one power supply preinstalled on the rear panel. You can install up
to two power supplies in the switch. You must order the second power supply and a power source cord
separately. 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 the power
supplies without powering o the switch or disrupng switch funcons.
NOTE: You must connect the baery returns of the DC power supply to frame ground.
To connect power to an EX4400 switch with a DC 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.
CAUTION: The connecon between each power source and power supply must
include a circuit breaker.
2. Ensure that the input circuit breaker is open so that the voltage across the DC power source cord
leads is 0 V and that the cord leads do not become acve while you are connecng DC power.
3. Ensure that the power supplies are fully inserted in the chassis.
4. Insert the power cord coupler rmly into the inlet and ghten the screws on the coupler by using the
screwdriver (see Figure 102 on page 167).
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