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ADCP-80-526 • Issue 6 • December 2006
Page 8
© 2006, ADC Telecommunications, Inc.
1.11 Output Power Connectors
Depending on the fuse configuration used, the fuse platform will have at least one, and up to
four, output power terminal blocks, located on the rear side of the platform. The number present
will depend on the fuse type and number of fuse positions. In general, there will be one terminal
block per bus for each fuse type present on that bus.
All of the output power terminal blocks are screw-down barrier terminal strips. The terminal
screws are of various sizes corresponding to the current load of the fuses. Each individual output
has two terminals, battery (BATT) and return (RTN).
Copper wire is used for output power wiring. Connections are typically made using ring or
spade-type connectors crimped onto the output wires. Table 1 gives terminal screw size,
maximum terminal width, and accepted wire gauge. In selecting wire size, follow local code
referring to the ampacity guidelines provided in Appendix A of this manual.
* Output terminal accepts wire sizes in the AWG range given; however, wire
size should be determined based on local requirements and practice.
1.12 Ground Connectors
Two #10 studs (with nuts) are provided for grounding the fuse platform chassis. The studs are
mounted on 0.625 inch (15.875 mm) centers.
Two crimp ring lug terminals for two #10 AWG wires are provided with each fuse platform. The
fuse platform may be grounded using only one stud.
1.13 Alarm Contact Operation
The fuse platform contains circuitry that opens and closes a set of alarm contacts when any fuse
on the bus fails or when input power to the bus is lost. These contacts may be used to open or
close a loop connected to an external alarm system.
Warning: In a fuse platform with KLM fuses, the KLM-fused output terminals will show –48
Vdc even when there is no load and no fuse in the fuse holder. This “phantom voltage” is
applied by the KLM circuitry alarm sensing function and will be less than 1 Amp.
Table 1. Output Power Terminal Blocks
FUSE
TYPE
FUSE HOLDER
MODULE
TERMINAL
SCREW SIZE
MAXIMUM
TERMINAL WIDTH
LUG/AWG
RANGE *
KLM All sizes 8-32 0.320 inch (8.128 mm) #10 to #22
TPA All sizes 8-32 0.320 inch (8.128 mm) #10 to #22
GMT 4- or 5-position 6-32 0.325 inch (8.255 mm) #12 to #22
GMT 10-position 6-32 0.260 inch (6.604 mm) #14 to #22
TPA/GMT 4 TPA fuses with 8-32 0.320 inch (8.128 mm) #10 to #22
10 GMT fuses 3-48 0.200 inch (5.080 mm) #16 to #24