Juniper MX480, Hardware Manual

Page: 204 / 420

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Wire cutters
• Electrostatic discharge (ESD) grounding wrist strap
CAUTION: The maximum torque rating of the terminal studs on the DC power
supply is 36 lb-in. (4.0 Nm). The terminal studs may be damaged if excessive
torque is applied. Use only a torque-controlled driver or socket wrench to
tighten nuts on the DC power supply terminal studs. Use an
appropriately-sized driver or socket wrench, with a maximum torque capacity
of 50 lb-in. or less. Ensure that the driver is undamaged and properly
calibrated and that you have been trained in its use. You may wish to use a
driver that is designed to prevent overtorque when the preset torque level is
achieved.
Grounding the MX480 Router
You ground the router by connecting a grounding cable to earth ground and then attaching
it to the chassis grounding points using UNC 1/4-20 two screws. You must provide the
grounding cable (cable lugs are supplied with the router). To ground the router:
1.
Verify that a licensed electrician has attached the cable lug provided with the router
to the grounding cable.
2.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to an approved site ESD grounding point. See the instructions for your site.
3.
Ensure that all grounding surfaces are clean and brought to a bright finish before
grounding connections are made.
4.
Connect the grounding cable to a proper earth ground.
5.
Detach the ESD grounding strap from the site ESD grounding point.
6.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
7.
Place the grounding cable lug over the grounding points on the upper rear of the
chassis. The bolts are sized for UNC 1/4-20 bolts.
8.
Secure the grounding cable lug to the grounding points, first with the washers, then
with the screws.
9.
Dress the grounding cable and verify that it does not touch or block access to router
components, and that it does not drape where people could trip on it.
Copyright © 2019, Juniper Networks, Inc. 204
MX480 Universal Routing Platform Hardware Guide