Table - Nortel Meridian 1 Manual

Appendix A: NT0R72, NT6D82, QBL12, QBL15, QCA13
Adding a second QBL15
Table 104 summarizes the connections in this procedure.
1 Unpack and mount the QBL15.
2 Open the front cover of the unit and remove the plate that covers the main
circuit breaker (or main fuse—CRS200).
3 Install and connect a red #4 AWG wire between the initially installed
QBL15 and the second QBL15.
• Before you install the wire, crimp a ring lug on each end, or use a
compression fitting like the type on the positive bus.
• The connection point on each unit is a 1/4-20 stud located at the top
of the large heatsink (see Figure 145). Note that there are already
four wires connected to the stud.
4 Install and connect a black #4 AWG wire between the initially installed
QBL15 and the second QBL15. The connection point on each unit is a
compression fitting, labeled GND POS (+), on the positive bus.
5 Do not set the main circuit breaker of the second QBL15 to ON (or do
not reinsert the main fuse in the box).
6 Replace the plate that covers the main circuit breaker (or main fuse).
Place a tag labeled "CIRCUIT BREAKER IS NON-FUNCTIONAL" on
the circuit breaker in the second QBL15.

Table 104

Cabling to add a second QBL15
AWG Color
#4 Red
#4 Black
From first QBL15
Stud on the heatsink
GND POS (+)
Page 397 of 500
To second QBL15
Stud on the heatsink
GND POS (+)
System installation procedures