# Safety Guidelines

For your safety, before installing the system, review all safety warnings in this section.

| Warning: The recommended maximum ambient temperature is 50° C (122° F). For safe operation, take into consideration the internal temperature of the rack.

| Warning: Install equipment in the rack from the bottom upward. Doing this helps maintain the stability of the rack and reduces the chance of the rack tipping over.

| Warning: Do not insert any metal object, such as a screwdriver, into an open slot or the backplane. Doing so might cause electric shock and serious burns.

| Warning: Three people are required to install the router in a rack: two to lift the system into position and one to screw it to the rack.

| Warning: Connect the router or rack to ground (earth), and ensure that a reliable grounding path is maintained in the rack.

| Warning: Do not work on the system or connect or disconnect cables during lightning activity.

| Warning: Be sure circuit breakers for the power source are in the OFF position before attaching power cables.

| Warning: Before servicing the router, turn off the power.

| Warning: Remove jewelry (including rings, necklaces, and watches) before working on equipment that is connected to power lines. Metal objects heat up when connected to power and ground and can cause serious burns or become welded to the terminals.

| Caution: Evaluate the overall loading of the branch circuit before you install any equipment into a rack.

## ERX310 Broadband Services Router Warnings (AC Model)

The following warnings apply only to the ERX310 router.

### ERX310 Power Cord Warnings (AC Model)

| Warning: This unit has more than one power-supply cord. Disconnect 2 power cords BEFORE servicing to avoid electric shock.

### Power Cable Warning (Japanese)

| Warning: The attached power cable is only for this product. Do not use the cable for another product.