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This appendix describes how to make DC power connections to the Catalyst 3550-24-DC switch. See the "Installing the Switch" section for instructions on installing the switch.
To connect the Catalyst 3550-24-DC switch to a DC-input power source, follow the steps in these sections:
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Warning The equipment is to be installed in a restricted access area. |
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Warning Ethernet cables must be shielded when used in a central office environment. |
Locate the ground lug and the two number-10-32 screws on the switch rear panel and the DC terminal block plug in the DC-switch accessory kit.
Obtain these necessary tools and equipment:
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Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
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Caution To make sure that the equipment is reliably connected to earth ground, follow the grounding procedure instructions, and use a UL-listed lug suitable for number-6 AWG wire and two number-10-32 ground-lug screws. |
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Warning When installing the unit, always make the ground connection first and disconnect it last. |
To ground the switch to earth ground, follow these steps. Make sure to follow any grounding requirements at your site.
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 mm) ± 0.02 inch (0.5 mm), as shown in Figure C-1.
Step 3 Slide the open end of the ground lug over the exposed area of the 6-gauge wire.
Step 4 Using a Panduit crimping tool, crimp the ground lug to the 6-gauge wire, as shown in Figure C-2.
Step 5 Use the two number-10-32 screws to attach the ground lug and wire assembly to the switch rear panel RPS connector, as shown in Figure C-3.
Step 6 Using a ratcheting torque screwdriver, torque each ground-lug screw to 15 lbf-in. (240 ozf-in.)
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Warning Only trained and qualified personnel should be allowed to install or replace this equipment. |
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Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. |
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Caution You must connect the Catalyst 3550-24-DC switch only to a DC-input power source that has an input supply voltage from -36 to -72 VDC. If the supply voltage is not in this range, the switch might not operate properly or might be damaged. |
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Caution The switch must be installed with 5 A-branch-circuit protection. |
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Note This installation must comply with all applicable codes. |
To wire the switch to a DC-input power source, follow these steps:
Step 2 Identify the positive and negative feed positions for the terminal block connection. The wiring sequence is positive to positive and negative to negative for both the A and the B feed wires. The switch rear panel identifies the positive and negative positions for both the A and B feed wires, as shown in Figure C-5.
Step 3 Using a 18-gauge wire-stripping tool, strip each of the four wires coming from the DC-input power source to 0.27 inch (6.6 mm) ± 0.02 inch (0.5 mm), as shown in Figure C-6. Do not strip more than 0.29 inch (7.4 mm) of insulation from the wire. Stripping more than the recommended amount of wire can leave exposed wire from the terminal block plug after installation.
Step 4 Insert the exposed wire of one of the four DC-input power source wires into the terminal block plug, as shown in Figure C-7. Make sure that you cannot see any wire lead. Only wire with insulation should extend from the terminal block.
Step 5 Use a ratcheting torque screwdriver to torque the terminal block captive screw (above the installed wire lead) to 4.5 lbf-in. (72 ozf-in.), as shown in Figure C-8.
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Caution Do not overtorque the terminal-block captive screws. The recommended maximum torque is 4.5 lbf-in. (72 ozf-in.) |
Step 6 Repeat Steps 4 and 5 for the remaining three DC-input power source wires. Figure C-9 shows the completed wiring of a terminal block plug.
Step 7 Insert the terminal block plug in the terminal block header on the switch rear panel, as shown in Figure C-10.
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Caution Secure the wires coming in from the terminal block so that they cannot be disturbed by casual contact. For example, use tie wraps to secure the wires to the rack. |
Step 8 Remove the tape from the circuit-breaker switch handle, and move the circuit-breaker handle to the on position.
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Caution To comply with the intrabuilding lightning surge requirements, intrabuilding wiring must be shielded, and the shield for the wiring must be grounded at both ends. |
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Caution The Catalyst 3550-24-DC switch is suitable only for intrabuilding or nonexposed wiring connections. |
Posted: Mon Feb 9 08:56:44 PST 2004
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