Safety Warnings

• When installing or servicing a Palo Alto Networks firewall or appliance hardware component that has exposed circuits, ensure that you wear an electrostatic discharge (ESD) strap. Before handling the component, make sure the metal contact on the wrist strap is touching your skin and that the other end of the strap is connected to earth ground.
• Use grounded and shielded Ethernet cables (when applicable) to ensure agency compliance with electromagnetic compliance (EMC) regulations.
• Fiber SFP transceivers emit invisible infrared lasers that can cause significant retinal damage if they make contact with your eyes. As a best practice, power off the device when installing or replacing an SFP module. If handling an SFP module while the device is operating, apply dust caps to the end of the transceiver or make sure to keep it pointed away from your eyes.
• Do not connect a supply voltage that exceeds the input range of the firewall or appliance. For details on the electrical range, refer to electrical specifications in the hardware reference for your firewall or appliance.
• Caution: Shock hazard Disconnect all power cords (AC or DC) from the power inputs to fully de-energize the hardware.

• Do not connect or disconnect energized DC wires to the power supply.
• The DC supply source must be located within the same premises as the firewall.
• The firewall must be in the same immediate area (such as adjacent cabinets) as any other equipment that has a connection between the earthing conductor of the DC supply circuit and the earthing of the DC system.
• Install all firewalls that use DC power in restricted access areas only. A restricted access area is where access is granted only to craft (service) personnel using a special tool, lock and key, or other means of security, and that is controlled by the authority responsible for the location.
• Install the firewall DC ground cable only as described in the power connection procedure for the firewall that you are installing. You must use the American wire gauge (AWG) cable specified and torque all nuts to the torque value specified in the installation procedure for your firewall.