System Overview System Cabinets
16 NFS-640 Installation Manual P/N 51332:B1 12/01/2003
2.3 System Cabinets
The control panel and modules are installed in a CAB-4 series backbox. There are four different
sizes available, holding from one to four rows of equipment plus batteries (up to two 25AH
batteries). Backboxes are ordered separately from doors. The doors can be mounted on the left or
the right side of the cabinet; reversible hinges are provided so that this choice can be made in the
field. Doors open a full 180 degrees and have locks. Mounting methods include surface-mounting
or semi-flush mounting on a wall between 16 inch (406.4 mm) on-center studs. A trim ring option
is available for semi-flush mounting.
External measurements for each cabinet size are provided below. Refer to CAB-3/CAB-4 Series
Cabinet Installation Document (shipped with the cabinet) for specific mounting drawings and
dimensions.
The control panel and adjacent first-row modules mount in chassis CHS-M2, typically in the
first/top row of the backbox. Additional rows of modules can be mounted in chassis CHS-4N
and/or CHS-4L.
Note: If using the new CHS-M2 in a CAB-3 series backbox or in a CAB-4 series backbox
manufactured before 11/2003, verify stud height and cut any stud that exceeds 0.375 in. (9.525
mm) if a CPU is being mounted above it. See warning and instructions in Section 3.5.1 “Control
Panel Circuit Board & Keypad/Display Unit”.
Some additional components available in the CAB-4 series include:
Note: When using trim rings, mount backbox with at least 1 inch (2.54 cm) between wall surface
and front of backbox, to allow door to open fully past the trim ring.
A-size backbox
(one row)
24.125 in (612.78 mm) wide
20.125 in (511.18 mm) tall
5.218 in (132.54 mm) deep
Optional trim ring TR-A4
Opening: 24.062 in (611.175 mm) wide;
20.062 in (508.813 mm) tall.
Molding width: 1.375 in (34.925 mm)
B-size backbox
(two rows)
24.125 in (612.78 mm) wide
28.625 in (727.08 mm) tall
5.218 in (132.54 mm) deep
Optional trim ring TR-B4
Optional trim ring TR-B4
Opening: 24.062 in (611.175 mm) wide;
28.562 in (725.475 mm) tall.
Molding width: 1.375 in (34.925 mm)
C-size backbox
(three rows)
24.125 in (612.78 mm) wide
37.250 in (946.15 mm) tall
5.218 in (132.54 mm) deep
Optional trim ring TR-C4
Optional trim ring TR-C4
Opening: 24.062 in (611.175 mm) wide;
37.187 in (944.55 mm) tall.
Molding width: 1.375 in (34.925 mm)
D-size backbox
(four rows)
24.125 in (612.78 mm) wide
45.875 in (1165.23 mm) tall
5.218 in (132.54 mm) deep
Optional trim ring TR-D4
Optional trim ring TR-D4
Opening: 24.062 in (611.175 mm) wide;
37.187 in (1163.625 mm) tall.
Molding width: 1.375 in (34.925 mm)
DP-DISP An Inner Dress Panel for covering the backbox area surrounding display
panels and various modules (required for Canadian installations).
Note: For use with NCA, KDM-2, and primary displays.
BMP-1 Blank Module Plate for covering an unused dress-panel position. Provides
another option for mounting modules such as TM-4, NCM-W, or NCM-F.
BP-4 Battery dress panel
VP-2B or MP-1B
(with DP-1B)
For covering top row(s) of backbox if control panel is mounted in a lower row.
MP-1B is also used to mount panel circuit modules.
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