ADCP-80-526 • Issue 6 • December 2006

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.

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

FUSE HOLDER

TERMINAL

MAXIMUM

LUG/AWG

RANGE *

TYPE

MODULE

SCREW SIZE

TERMINAL WIDTH

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

 

 

 

 

 

*Output terminal accepts wire sizes in the AWG range given; however, wire size should be determined based on local requirements and practice.

1.12Ground 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.

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© 2006, ADC Telecommunications, Inc.