Cisco Systems ME 3400 User Manual
APPENDIX
Connecting to DC Power
To connect the Cisco ME switch to a DC-input power source, follow these steps:
1. Preparing for Installation, page C-1
2. Grounding the Switch, page C-2
3. Wiring the DC-Input Power Source, page C-5
C
Warning
Warning
Caution Installation of the equipment must comply with local and national electrical codes.
Note We recommend that you use 18 AWGcopper wiring for Network Equipment Building Systems (NEBS)
Note You can use the grounding lug to attach a wrist strap for ESD protection during servicing.
This unit is intended for installation in restricted access areas. A restricted access area can be
accessed only through the use of a special tool, lock and key, or other means of security.
Statement 1017
Before performinganyof thefollowing procedures,ensure thatpower isremoved fromthe DC circuit.
Statement 1003
installation. This guideline follows the standard guidelines for DC power wiring in the Central Office.
Preparing for Installation
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Locate the DC terminal block plug, the ground lug, and the two number-10-32 screws in the
DC-switch kit.
Obtain these necessary tools and equipment:
• Ratcheting torque screwdriver with a Phillips head that exerts up to 15 pound-force inches (lbf-in.)
of pressure.
• Panduit crimping tool with optional controlled cycle mechanism (model CT-700, CT-720, CT-920,
CT-920CH, CT-930, or CT-940CH).
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
C-1
Grounding the Switch
• 6-gauge copper ground wire (insulated or noninsulated).
• Four leads of copper wire. The DC terminal block (Figure C-11) 12-28 AWG copper wire.
Note We recommend that you use 18 AWG copper wiring for Network Equipment Building Systems
(NEBS) installations. This guideline follows thestandard guidelines for DC power wiring in the
Central Office.
• Wire-stripping tools.
Grounding the Switch
Appendix C Connecting to DC Power
Warning
Warning
Caution To make sure that the equipment is reliably connected to earth ground, follow the grounding
This equipment is intended to be grounded. Ensure that the host is connected to earth ground during
normal use. Statement 39
When installingthe unit, always make theground connection first anddisconnect it last. Statement 42
procedure instructions, and use a UL-listed lug suitable for number-6AWGwire and two number-10-32
ground-lug screws.
Preparing the Ground Wire
Before you ground the switch to earth ground, you must prepare the ground wire. Follow these steps.
Make sure to follow any grounding requirements at your site.
Step 1 Locate the ground lug and the two number-10-32 screws. A ground lug and screws are located both on
the front panel and on the rear panel of the switch. Only one ground connection is required.
Use a standard Phillips screwdriver or a ratcheting torque screwdriver with a Phillips head.
Set the screws and the ground lug aside.
Step 2 If your ground wire is insulated, use a wire stripping tool to strip the 6-gauge ground wire to 0.5 inch
(12.7 millimeter [mm]) 0.02 inch (0.5 mm) as shown in Figure C-1.
C-2
Figure C-1 Stripping the Ground Wire
0.5 in. (12.7 mm) ± 0.02 in. (0.5 mm)
Insulation
Step 3 Slide the open end of the ground lug over the exposed area of the 6-gauge wire.
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
Wire lead
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Appendix C Connecting to DC Power
Step 4 Using a Panduit crimping tool, crimp the ground lug to the 6-gauge wire.
Figure C-2 Crimping the Ground Lug
Step 5 Use the two number-10-32 screws to attach the ground lug and wire assembly to the rear panel of
the switch.
Step 6 Using a ratcheting torque screwdriver, torque each ground-lug screw to 15 lbf-in. (240 ounce-force
inches [ozf-in.]). Figure C-3 shows how to torque the ground screws on a Cisco ME DC switch.
Grounding the Switch
60529
Figure C-3 Torquing Ground-Lug Screws
132854
1
1 Torque to 15 lbf-in.
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Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
C-3
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