Cisco Firepower 4100 Series Hardware Installation Manual page 73

Maintenance and Upgrade
Figure 53: Insert the Cables
Step 8 Tighten the M5 screw with the captive washer to the recommended torque of 5 in-lbs for the positive stud and wire.
Secure the wires coming in from the terminal block so that they cannot be disturbed by casual contact.
Figure 54: Tighten the M5 Screws
Step 9 Replace the terminal block plastic cover. The plastic cover is slotted and keyed to fit correctly over the terminal block.
This cover should always be in place when power is applied to the terminals.
Cisco Firepower 4110, 4120, 4140, and 4150 Hardware Installation Guide
Connect the DC Power Supply Module
69