Version 5.2 Sourcefire 3D System User Guide 248
Power Requirements for Sourcefire Devices
3D8120/8130/8140 and 3D8250/8260/8270/8290
Appendix A
DC Current
20A maximum, per supply
Ground Reference
The DC power supplies are fully isolated from the ground reference.
Recommended Terminals
Power is connected to the DC supplies through screw terminals. Terminals must
be UL approved. Terminals must have a hole supporting an M4 or a #8 screw. The
maximum width of the terminal is 8.1mm (0.320”). A representative spade
terminal for 10-12 gauge wire is Tyco 325197.
Breaker Requirements
A breaker sufficient to carry the rated current at the rated voltage must be
provided. The circuit breaker must meet the following requirements:
• UL Recognized
• CSA Approved (Recommended)
• VDE Approved (Recommended)
• Support the maximum load (20A)
• Support the installation voltage (-40V to -72VDC, as required by the power
supply)
• Rated for DC use
A recommended breaker is: Airpax IELK1-1-72-20.0-01-V. The terminal option
used will depend on the installation. This breaker is a single pole, 20A breaker
with a DC rating of 80V. It is listed as having a long delay. Information about this
breaker can be found at
http://www.airpax.net/site/utilities/eliterature/pdfs/ial.pdf.
Minimum Wire Size Requirements
Power feeds with three wires (one circuit) per raceway may use 12 AWG wire.
Power feeds with more than one circuit per raceway must use 10 AWG wire.
Note that the two separate feeds for the redundant supplies are two circuits and
must use 10 AWG wire.
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