# Cabling the Router for Power

After you have correctly cabled the modules and I/O modules, you must attach grounding and electrical wires before you attempt system power-up. Three main tasks are involved:

1. Switch all router power switches to OFF.

   | Caution: Switches may have inadvertently flipped to ON during shipping and installation.

2. Connect the grounding wires to the chassis.

   | Warning: Always connect the grounding wires first (before connecting the power cables) and disconnect them last when installing or servicing the router.

3. Connect the power cables (AC or DC) to the power input modules.

See System Specifications for the power requirements for ERX routers. Table 8 identifies the power input module cabling requirements, and Figure 26 shows the main components of a power input module.

Table 8: Power Input Module Cables and Wires Needed

Cable/Wire | From | To
--- | --- | ---
ERX14xx models
One 10-AWG ground wire | Power input module ground terminal | Termination ground
Two 8-AWG wire leads | Power input module Power A –48 VDC and RTN leads | Appropriate leads on power source No.1
Two 8-AWG wire leads | Power input module Power B –48 VDC and RTN leads | Appropriate leads on power source No.2
ERX7xx models
One 10-AWG ground wire | Power input module ground terminal | Termination ground
Two 12-AWG wire leads | Power input module Power A –48 VDC and RTN leads | Appropriate leads on power source No.1
Two 12-AWG wire leads | Power input module Power B –48 VDC and RTN leads | Appropriate leads on power source No.2
ERX310 Router
One 10-AWG ground wire | Power input module ground terminal | Termination ground
Two 14-AWG wire leads (DC model only) | Power input module Power A –48 VDC and RTN leads | Appropriate leads on power source No.1
Two 14-AWG wire leads (DC model only) | Power input module Power B –48 VDC and RTN leads | Appropriate leads on power source No.2
One AC power cord (AC model only) | Power input module AC power IEC receptacle | Appropriate AC power supply

Figure 26: Power Input Module for ERX14xx Models

## Task 1: Turn Off All Router Power

Before starting, you must switch all router power switches to OFF.

To turn off the router, push each power switch to the OFF position.

## Task 2: Connect the Grounding Cables

All ERX routers have two grounding studs located in the rear of the chassis, near the power inputs. Each stud provides grounding for a single power unit.

To ground each power unit:

1. Locate the grounding studs on the router (Figure 26 and Figure 27).
2. Remove the nuts and locking washers from the grounding studs.

   | Note: We recommend a minimum of 10-AWG ground wire with a ring style terminal.

3. Place the grounding cable lead on one of the grounding studs and tighten the nuts to secure the connection.
4. Connect the other end of the ground cable to the appropriate ground termination lead.
5. Repeat Steps 3–4 for the remaining grounding stud.

   | Note: When grounding an ERX router, leave a service loop in the grounding cable to ensure that the grounding cable is the last cable to disconnect from the shelf if strain is placed on the electrical cables.

## Task 3: Connect the Power Cables

To connect power cables to the router, follow these steps. Refer to Figure 26, Figure 27, and Figure 28 as needed.

### ERX7xx Models, ERX14xx Models, ERX310 Router (DC Model)

| Warning: Before you begin this procedure, ensure that all power switches are in the OFF position.

1. Be sure you have completed Task 1 and Task 2 in the previous sections.
2. If applicable, loosen the screws (using a No. 2 Phillips screwdriver, if necessary) from the clear power input module cover and remove it.

   | Warning: Be sure the power source is turned off, the router is turned off, and proper grounding wires are attached before continuing with this procedure.

   | Warning: The wiring color code of the power cables depends on the color coding of the DC power source installed at your site. Color code standards for DC wiring do not exist. To ensure that the correct polarity is connected to the router power units, confirm the connection of the power cables to the + (positive) and – (negative) leads at the power source.

3. Remove the nuts and locking washers from the posts for the power input (A or B) using a small insulated adjustable wrench.
4. Place one negative (neutral) cable lead on the post labeled –48 VDC.
5. Replace the locking washers and nuts, and tighten the nuts to secure the connection.
6. Place the other cable lead on the post labeled RTN.
7. Replace the locking washer and nut, and tighten the nut to secure the connection.
8. Attach the opposite end of Power A's wire leads to the appropriate leads on your power source.

   | Note: To provide redundancy, do not terminate Power A and Power B leads at the same power source.

9. Place the clear plastic guard over the terminal posts, and secure it in place by tightening the four screws.

   | Caution: Do not overtighten the screws.

10. Repeat Steps 1–9 for each power input module in your configuration.

    Figure 27: ERX310 Router, Rear View (DC Model)

### ERX310 Router (AC Model)

1. Insert the power cord into the AC power IEC receptacle. (See Figure 28.)
2. Insert the other end of the power cord into an appropriate AC power source.

   | Note: To provide redundancy, do not terminate Power A and Power B leads at the same power source.

3. Repeat Steps 1–2 for the other power input module, if needed.

   Figure 28: ERX310 Router, Rear View (AC model)