Connecting the EX3200 to Power

Connect Earth Ground to an EX Series Switch

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect an EX Series switch to earth ground before you connect power to the switch. You must use the protective earthing terminal on the switch chassis to connect the switch to earth ground (see Figure 2).

You must install the EX Series switch in a restricted–access location and ensure that the chassis is always properly grounded. EX Series switches have a two–hole protective grounding terminal provided on the chassis. See Table 1 for the location of the earthing terminals on various EX Series switches. We recommend that you use the protective grounding terminal as the preferred method for grounding the chassis regardless of the power supply configuration. However, if additional grounding methods are available, you can also use those methods. For example, you can use the grounding wire in the power cord of an AC power supply or use the grounding terminal or lug on a DC power supply. This system was tested to meet or exceed all applicable EMC regulatory requirements with the two-hole protective grounding terminal connected correctly.

Ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

Parts and Tools Required for Connecting an EX Series Switch to Earth Ground

Before you begin connecting an EX Series switch to earth ground, ensure you have the parts and tools required for your switch.

Table 1 lists the earthing terminal location, grounding cable and lug specifications, and parts needed for connecting an EX Series switch to earth ground.

Table 1: Parts Required for Connecting an EX Series Switch to Earth Ground

Switch	Earthing Terminal Location	Grounding Cable Requirements	Grounding Lug Specifications	Screws and Washers	Additional Information
EX2200	Rear panel of the chassis	14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCC10-14BWL or equivalent— not provided	Two 10-32 x .25 in. screws with #10 split-lock washer— not provided Two #10 flat washers—not provided
EX2300-C	Rear panel of the chassis	14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCC10-14AW-L or equivalent— not provided	Two 10-32 x .25 in. screws with #10 split-lock washer— not provided Two #10 flat washers—not provided
EX2300	Rear panel of the chassis	EX2300 switches except EX2300-24MP and EX2300-48MP models—14 AWG (2 mm²), minimum 90°C wire, or as permitted by the local code EX2300-24MP and EX2300-48MP models—14-10 AWG STR (2.5-6 mm²), 12-10 AWG SOL (4-6 mm²) minimum 90°C wire, or as permitted by the local code—not provided	EX2300 switches except EX2300-24MP and EX2300-48MP models—Panduit LCC10-14AW-L or equivalent—not provided EX2300-24MP and EX2300-48MP models—Panduit LCA10-10L or equivalent—not provided	EX2300 switches except EX2300-24MP and EX2300-48MP models Two 10-32 x .25 in. screws with #10 split-lock washer—not provided Two #10 flat washers—not provided EX2300-24MP and EX2300-48MP models One Pan Phillips M 4 x 6 mm Nickel plated screw—provided
EX3200, EX3300, and EX3400	Rear panel of the chassis	14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCC10-14BWL or equivalent— not provided	Two 10-32 x .25 in. screws with #10 split-lock washer— not provided Two #10 flat washers— not provided	For EX3200 Switches See Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch.
EX4200, EX4500, and EX4550	Left side of the chassis	14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCC10-14BWL or equivalent— not provided	Two 10-32 x .25 in. screws with #10 split-lock washer— not provided Two #10 flat washers— not provided	See Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch.
EX6210	Rear panel of the chassis (on lower left side)	The grounding cable must be the same gauge as the power feed cables and as permitted by the local code.	Panduit LCD2-14A-Q or equivalent —provided	Two ¼ -20 x 0.5 in. screws with #¼” split-washer —provided Two #¼” flat washers— provided
EX8208	Left side of the chassis	6 AWG (13.3 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCD2-14A-Q or equivalent —provided	Two ¼ -20 x 0.5 in. screws with #¼” split-washer —provided Two #¼” flat washers— provided
EX8216	Two earthing terminals: Left side of the chassis Rear panel of the chassis Note: You must use only one of the two protective earthing terminals.	2 AWG (33.6 mm²), minimum 90° C wire, or as permitted by the local code	Panduit LCD2-14A-Q or equivalent —provided	Two ¼ -20 x 0.5 in. screws with #¼” split-washer —provided Two #¼” flat washers— provided
EX9204, EX9208, and EX9214	Rear panel of the chassis	One 6 AWG (13.3 mm²), minimum 90° C wire, or one that complies with the local code	Thomas& Betts LCN6-14 or equivalent— provided	Two ¼ -20 x 0.5 in. screws with #¼” split-washer— provided Two #¼” flat washers— provided	See Grounding Cable and Lug Specifications for EX9200 Switches.
EX9251	Rear panel of the chassis	12 AWG (2.5 mm²), minimum 90° C wire, or one that complies with the local code— not provided	Panduit LCD10-10A-L or equivalent— not provided	Two 10-32 screws— provided	See Grounding Cable and Lug Specifications for EX9200 Switches.
EX9253	Right side of the chassis	14-10 AWG (2-5.3 mm²), minimum 90° C wire, or one that complies with the local code— not provided	Panduit LCD10-14B-L or equivalent— provided	Two M5 Pan Head screws— provided

Tools required for connecting an EX Series switch to earth ground:

An electrostatic discharge grounding strap (provided)
A Phillips (+) number 2 screwdriver to tighten the screws.

An AC–powered EX Series switch gains additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical location.

Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch

Table 2 lists the special instructions that you might need to follow before connecting earth ground to a switch.

Table 2: Special Instructions to Follow Before Connecting Earth Ground to an EX Series Switch

Switch

Special Instructions

EX3200 and EX4200

Some early variants of EX3200 and EX4200 switches for which the Juniper Networks model number on the label next to the protective earthing terminal is from 750-021xxx through 750-030xxx require 10-24x.25 in. screws.

EX4200, EX4500, and EX4550

If you plan to mount your switch on four posts of a rack or cabinet, mount your switch in the rack or cabinet before attaching the grounding lug to the switch.

Note: The protective earthing terminal on switches mounted on four posts of a rack is accessible through the slot on the left rear bracket only if the rack is 27.5 in. (69.85 cm) through 30.5 in. (77.47 cm) deep for a switch mounted flush with the rack front and 29.5 in. (74.93 cm) through 32.5 in. (82.55 cm) deep for a switch mounted 2 in. (5.08 cm) recessed from the rack front. See Figure 1.

Connecting the Grounding
Lug to a Switch Mounted on Four Posts of a Rack

Note: The brackets must be attached to the chassis before the grounding lug is attached. (The brackets are shown pulled away from the chassis so that the protective earthing terminal is seen.)

Connecting Earth Ground to an EX Series Switch

To connect earth ground to an EX Series switch:

Verify that a licensed electrician has attached the cable lug to the grounding cable.
Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
Attach an ESD grounding strap to your bare wrist, and connect the strap to the ESD grounding point on the switch.
Place the grounding lug attached to the grounding cable over the protective earthing terminal. See Figure 2.
Figure 2: Connecting a Grounding Cable to an EX Series Switch
Secure the grounding lug to the protective earthing terminal with the washers and screws.
Dress the grounding cable and ensure that it does not touch or block access to other switch components and that it does not drape where people could trip over it.

Connecting AC Power to an EX3200 Switch

The power supply in an EX3200 switch is a field-replaceable unit (FRU).

Before you begin connecting AC power to an EX3200 switch:

Ensure that you have connected the device chassis to earth ground, if required by your site guidelines or installation. A ground connection to the protective earthing terminal is not required for an AC-powered switch. The AC power cords provide adequate grounding when you connect the power supply in the switch to a grounded AC power outlet by using the AC power cord appropriate for your geographical location (see AC Power Cord Specifications for EX3200 Switches).
Caution
For installations that require a separate grounding conductor to the chassis, have a licensed electrician complete this connection before you connect the switch to power. For instructions on connecting earth ground, see Connect Earth Ground to an EX Series Switch.
Install the power supply in the chassis. For instructions on installing a power supply in an EX3200 switch, see Installing a Power Supply in an EX3200 Switch.

Note

The power supply must be connected to a dedicated power source outlet.

Ensure that you have the following parts and tools available:

A power cord appropriate for your geographical location

To connect AC power to the switch:

Ensure that the power supplies are fully inserted in the chassis and the screws on their faceplates are tightened.
Squeeze the two sides of the power cord retainer clip and insert the L-shaped ends of the wire clip into the holes in the bracket on each side of the AC power cord inlet on the AC power supply faceplate (see Figure 3).
Locate the power cord or cords shipped with the switch; the cords have plugs appropriate for your geographical location. Warning
Ensure that the power cord does not block access to switch components or drape where people can trip on it.
Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.
Push the cord into the slot in the adjustment nut of the power cord retainer. Turn the nut until it is tight against the base of the coupler and the slot in the nut is turned 90° from the top of the switch (see Figure 4).
If the AC power source outlet has a power switch, set it to the OFF (0) position.
Insert the power cord plug into an AC power source outlet.
If the AC power source outlet has a power switch, set it to the ON (|) position.
Verify that the AC OK LED on the power supply is lit and is on steadily.Note
When you connect power to the switch, the Alarm (ALM) LED lights red. This behavior is normal. Plugging an active Ethernet cable into the management (MGMT) port on the switch completes the network link and turns off the ALM LED. (See Connect a Device to a Network for Out-of-Band Management.)
Connecting the switch to a dedicated management console instead of a network does not affect the ALM LED. The LED remains red until the switch is connected to a network.

Connecting the AC Power Cord Retainer Clip to an AC Power Supply
in an EX3200 Switch

Connecting an AC Power Cord to an AC Power Supply in an EX3200 Switch

Connecting DC Power to an EX3200 Switch

The power supply in an EX3200 switch is a field-replaceable unit (FRU).

Warning

DC-powered EX3200 switches are intended for installation only in a restricted access location.

Before you begin connecting DC power to an EX3200 switch:

Ensure that you have connected the switch chassis to earth ground.
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).
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect EX3200 switches to earth ground before you connect them to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to the earth ground. For instructions on connecting earth ground, see Connect Earth Ground to an EX Series Switch.
Install the power supply in the chassis. For instructions on installing a power supply in an EX3200 switch, see Installing a Power Supply in an EX3200 Switch.