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Connecting 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 34).

Warning: The switch is installed in a restricted-access location. It has a separate protective earthing terminal on the chassis that must be permanently connected to earth ground to adequately ground the chassis and protect the operator from electrical hazards.

Caution: Before switch installation begins, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

This topic describes:

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

Table 32 lists the earthing terminal location, grounding cable requirements, grounding lug specifications, screws and washers required, and the screwdriver needed for connecting a switch to earth ground. Before you begin connecting a switch to earth ground, ensure you have the parts and tools required for your switch.

Table 32: Parts and Tools Required for Connecting an EX Series Switch to Earth Ground

Switch	Earthing Terminal Location	Grounding Cable Requirements	Grounding Lug Specifications	Screws and Washers	Screwdriver	Additional Information
EX2200	Rear panel of 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	Phillips (+) number 2
EX3200	Rear panel of 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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX3300	Rear panel of 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	Phillips (+) number 2
EX4200	Left side of chassis	14 WG (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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX4300	Left side of 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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX4500	Left side of 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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX4550	Left side of 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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX6210	Rear panel of chassis (on lower left side)	The grounding cable must be the same gage 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	Phillips (+) number 2
EX8208	Left side of chassis	6 AWG (13.3 mm²), minimum 60°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	Phillips (+) number 2
EX8216	Two earthing terminals: Left side of chassis Rear panel of chassis	2 AWG (33.6 mm²), minimum 60°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	Phillips (+) number 2	See Special Instructions to Follow Before Connecting Earth Ground to a Switch.
EX9204	Rear panel of chassis	One 6 AWG (13.3 mm²), minimum 60°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	Phillips (+) number 2	See Grounding Cable and Lug Specifications for EX9200 Switches.
EX9208	Rear panel of chassis	One 6 AWG (13.3 mm²), minimum 60°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	Phillips (+) number 2	See Grounding Cable and Lug Specifications for EX9200 Switches.
EX9214	Rear panel of chassis	One 6 AWG (13.3 mm²), minimum 60°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	Phillips (+) number 2	See Grounding Cable and Lug Specifications for EX9200 Switches.

Special Instructions to Follow Before Connecting Earth Ground to a Switch

Table 33 lists the special instructions that you might need to follow before connecting earth ground to a switch.

Table 33: Special Instructions to Follow Before Connecting Earth Ground to a Switch

Switch

Special Instructions

EX3200

Note: Some early variants of EX3200 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

Note: Some early variants of 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.

Note: The protective earthing terminal on an EX4200 switch 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. through 30.5 in. deep for a switch mounted flush with the rack front and 29.5 in. through 32.5 in. deep for a switch mounted 2 in. recessed from the rack front. See Figure 33.

Figure 33: Connecting the Grounding Lug to a Switch Mounted on Four Posts of a Rack

1 — Protective earthing terminal	3 — Grounding lug
2 — Side mounting-rail	4 — Rear mounting-blade

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.)

EX4300

Note: The protective earthing terminal on an EX4300 switch 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. through 30.5 in. deep for a switch mounted flush with the rack front and 29.5 in. through 32.5 in. deep for a switch mounted 2 in. recessed from the rack front.

EX4500

Note: 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. See Mounting an EX4500 Switch on Four Posts in a Rack or Cabinet.

Note: The protective earthing terminal on an EX4500 switch 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. through 30.5 in. deep for a switch mounted flush with the rack front and 29.5 in. through 32.5 in. deep for a switch mounted 2 in. recessed from the rack front.

EX4550

Note: The protective earthing terminal on an EX4550 switch 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. through 30.5 in. deep for a switch mounted flush with the rack front and 29.5 in. through 32.5 in. deep for a switch mounted 2 in. recessed from the rack front.

EX8216

Note: Only one of the two protective earthing terminals needs to be permanently connected to earth ground.

Connecting Earth Ground to an EX Series Switch

To connect earth ground to a switch:

Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
Place the grounding lug attached to the grounding cable over the protective earthing terminal. See Figure 34.
Figure 34: 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.
Warning: Ensure that the cable does not drape where people could trip over it.

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Connecting Earth Ground to an EX Series Switch

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Modified: 2015-06-23