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ADCP-80-526 • Issue 6 • December 2006
Page 7
© 2006, ADC Telecommunications, Inc.
1.8 Bus Capacity
The current capacity of each power bus is 100 Amps maximum, which is marked above the
input connectors on the rear of the fuse platform. The total current of a fuse platform with two
buses is 200 Amps maximum. The power dissipation of the fuse platform is 80 watts maximum
per fuse platform (40 watts per bus at 100 Amps)
The following lists the maximum current that each type of fuse can provide:
• TPA type fuse (each fuse in two, four, or six position module): 50 Amps max.
• KLM type fuse (each fuse in two or four position modules): 30 Amps max.
• GMT type fuse (each fuse in four position module): 15 Amps max.
• GMT type fuse (each fuse in 10 position modules): 10 Amps max.
1.9 Input Voltage
The fuse platform can accommodate –24 Vdc input power on both busses or –48 Vdc input
power on both busses. The voltage is sensed by the fuse platform circuitry.
The input voltage used with the fuse platform is required to have the following voltage
characteristics:
• –24 Vdc nominal, within a range of –21 Vdc to –30 Vdc
• –48 Vdc nominal, within a range of –42 Vdc to –56 Vdc
Fuse panels for use with other input voltage values and polarity may be available by special
order.
1.10 Input Power Connectors
Input power to the power bus is supplied through an input power terminal block located on the
rear side of the fuse platform. Dual bus fuse platforms have a separate input terminal block for
each bus. If two buses are present, the terminal blocks are designated A and B, corresponding to
the two power buses.
Each input terminal block includes two pairs of 0.25-inch studs that are used for connecting the
BATT (battery –) and RTN (return +) input power cables. Each pair of studs is mounted on
0.625 inch centers and accepts various size 2-hole compression lugs. The maximum lug width is
0.62 inches.
Compression lugs for various sizes AWG wire are available as accessory items. Nuts with
captive washers are included to secure the compression lugs to the studs. The input terminal
blocks are located on the rear side of the panel.
The minimum recommended wire size for the input power wiring is #2 AWG copper wire. In
selecting wire size, follow local code referring to the ampacity guidelines provided in Appendix
A of this manual.