Juniper EX4500 Series, Руководство по оборудованию, Страница: 131 / 327

Figure 38: Connecting the Power Supply Cord to an EX4500 Switch
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Tighten
adjustment
nut.
Retainer
clip
Adjustment
nut
SEE ALSO
AC Power Supply in EX4500 Switches | 58
Connecting DC Power to an EX4500 Switch
You can install two DC power supplies in an EX4500 switch. After you have installed at least one power
supply, you can connect power to the switch.
WARNING: Before performing DC power procedures, ensure that power is removed
from the DC circuit. To ensure that all power is off, locate the circuit breaker on the
panel board that services the DC circuit, switch the circuit breaker to the OFF position,
and tape the switch handle of the circuit breaker in the OFF position.
CAUTION: Before you connect power to the switch, a licensed electrician must attach
a cable lug to the grounding and power cables that you supply. A cable with an
incorrectly attached lug can damage the switch (for example, by causing a short circuit).
CAUTION: Do not mix different types (AC and DC) of power supplies or power supplies
with front-to-back or back-to-front airflow in the same chassis.
Before you begin connecting DC power to the switch:
•
Ensure that you have taken the necessary precautions to prevent ESD damage (see “Prevention of
Electrostatic Discharge Damage” on page 305 ).
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