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Before you begin connecng AC power to the switch:

• Ensure that you have taken the necessary precauons to prevent electrostac discharge (ESD)

damage (see "Prevenon of Electrostac Discharge Damage" on page 194).

• Ensure that you have connected the switch chassis to earth ground.

CAUTION: Before you connect power to the switch, a licensed electrician must aach

a cable lug to the grounding and power cables 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. For installaons that require a separate grounding conductor to the chassis,

use the protecve earthing terminal on the switch chassis to connect to the earth

ground. For instrucons on connecng earth ground, see "Connect the QFX5200 to

Earth Ground" on page 109. The switch gains addional grounding when you plug the

power supply in the switch into a grounded AC power outlet by using the AC power

cord appropriate for your geographical locaon (see "QFX5200 Power Cord

Specicaons" on page 43).

• Install the power supply in the chassis. For instrucons on installing a power supply in a QFX5200,

see "Installing a Power Supply in a QFX5200" on page 133.

The QFX5200 is shipped from the factory with two power supplies. 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 install replacement power supplies in the two slots next to the fan modules without

powering o the switch or disrupng the switching funcon.

NOTE: Each power supply must be connected to a dedicated power source outlet.

To connect AC power to a QFX5200:

1. Aach the grounding strap to your bare wrist and to a site ESD point.

2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure. If only one

power supply is installed, ensure a that blank cover panel is installed over the second power supply

slot.

3. Locate the power cord or cords shipped with the switch; the cords have plugs appropriate for your

geographical locaon.

113

Juniper QFX5200 User Manual

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