3Com H3C SECPATH F5000-A5 ADVANCED VPN FIREWALL 12-PORT GIGABIT ETHERNET MODULE Installation Manual page 57

Figure 4-12 DC power module
(1) Captive screw
(3) Power switch
(5) Power module handle
DC power cables
Figure 4-13 DC power cables
(1) (2) (3)
(9) (8)
(1) Naked crimping terminal, OT, 6mm^2, M4, tin plating, naked ring terminal, 12 to 10 AWG
(2) Heat shrink tube
(3) Label 1 (+)
(4) Power cable, 600V, UL10455, 5.3 mm^2, 10AWG, black, 45 A
(5) Main label
(6) Heat shrink tube
(7) Power cable, 600 V, UL10455, 5.3 mm^2, 10AWG, blue, 45 A
(8) Label 2 (–)
(9) Common terminal, conductor cross section, 6mm^2, 20mm, 30 A, insertion depth 12 mm, black
Formula for calculating the cross section area of a DC power cable: S=2*I*L/(57*∆U)
Where,
I: Current in amperes.
L: Length of the power cable in meters.
∆V: Voltage drop on the power cable from the power distribution frame (PDF) to the firewall, usually, 3.2
V.
S: Cross section area of the power cable in square millimeters.
Connection procedure
Follow these steps to connect the DC power cables:
(4) (5)
(7)
4-12
(2) DC input terminals
(4) Power LED
(6)