Cisco Firepower 4100 Series Hardware Installation Manual page 70

Connect the DC Power Supply Module
Warning
Statement 1045—Short-Circuit Protection
This product requires short-circuit (overcurrent) protection to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations.
Warning Statement 1046—Installing or Replacing the Unit
When installing or replacing the unit, the ground connection must always be made first and disconnected last.
Warning Statement 1077—Do Not Operate Unit Without Covers
The covers are an integral part of the safety design of the product. Do not operate the unit without the covers
installed.
Warning Statement 1073—No User-Serviceable Parts
No user-serviceable parts inside. Do not open.
Warning Statement 1086—Power Terminals, Replace Cover
Hazardous voltage or energy may be present on power terminals. Always replace cover when terminals are
not in service. Be sure uninsulated conductors are not accessible when cover is in place.
Each DC input power cable is terminated at the PDU by a cable lug, as shown in the following figure.
Note
DC input power cables must be connected to the PDU terminal studs in the proper positive (+) and negative
(–) polarity. In some cases, the DC cable leads are labeled, which is a relatively safe indication of the polarity.
However, you must verify the polarity by measuring the voltage between the DC cable leads. When making
the measurement, the positive (+) lead and the negative (–) lead must always match the (+) and (–) labels on
the power distribution unit.
Figure 50: DC Input Power Cable Lug
Cisco Firepower 4110, 4120, 4140, and 4150 Hardware Installation Guide
66
Maintenance and Upgrade