2-15
Chapter 2 Installing FACP Components
Step 1. Mounting Back Boxes
Overview Three different sizes of system back boxes are available, accommodating one, two, or three
electronics bays. These back boxes are shipped in large containers separate from the system
electronics. If system electronics containers are shipped with the back box containers, store the
system electronics containers in a safe, clean, and dry location until the back box installation is
completed, and you are ready to install the system electronic bays.
Note:
• Conductor entrance and routing restrictions apply to power-limited systems only.
• All back box PIDs are listed in Chapter 1.
Specifications Table 2-7 lists the specifications for the back boxes.
Make sure that you have the necessary hardware before you begin the installation procedure.
The Back Box Bay Mounting Hardware Kit should have all of the items listed in Table 2-8.
Table 2-7. Back Box Specifications
PID
Number
Description Height Width Rough Opening
Size Weight Box Trim Door Box Height Width
2975-9410/9407/
9438
1 Bay 55 lb.
(25 kg)
20-¾ in.
(527 mm)
23-½ in.
(597 mm)
26-
3/8 in.
(670 mm)
26-3/8 in.
(670 mm)
21-¼ in.
(540 mm)
26 ¼ in.
(667 mm)
2975-9411/9408/
9439
2 Bay 125 lb.
(57 kg)
36-¼ in.
(921 mm)
39-
1/8 in.
(994 mm)
26-3/8 in.
(670 mm)
25-¾ in.
(654 mm)
36-¾ in.
(933 mm)
26 ¼ in.
(667 mm)
2975-9412/9409/
9440
3 Bay 185 lb.
(84 kg)
52-
1/8 in.
(1,324 mm)
55 in.
(1,397 mm)
26-3/8 in.
(670 mm)
25-¾ in.
(654 mm)
52 5/8 in.
(1,337
mm)
26 ¼ in.
(667 mm)
Table 2-8. Contents of the Back Box Bay Mounting Hardware Kit
Part Number Description
Quantity Per Back Box
1-Bay Box 2-Bay Box 3-Bay Box
268-010 Lockwasher (No. 8) 4 8 12
490-011 Washer 4 8 12
426-033 Screw (No. 8 Torx, 5/16 in.) 4 8 12
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