16 NFS2-640/E Installation Manual — P/N 52741:P2 7/10/14
System Overview System Cabinets
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 26 AH
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 (40.64 cm) on-center studs. A trim ring option is
available for semi-flush mounting.
External measurements for each backbox are provided below; door dimensions are larger. Refer to
CAB-3/CAB-4 Series Cabinet Installation Document (shipped with the cabinet) for specific
mounting drawings and door dimensions.
For details on mounting options within the cabinet, see Section 3.4, “Laying Out Equipment in
Cabinet and Chassis”.
A-size backbox
(one row)
24.00 in (60.96 cm) wide
20.00 in (50.8 cm) tall
5.218 in (13.254 cm) deep
Uses optional trim ring TR-A4
Optional trim ring TR-A4
Opening: 24.062 in (61.118 cm) wide;
20.062 in (50.881 cm) tall.
Molding width: 1.375 in (3.493 cm)
B-size backbox
(two rows)
24.00 in (60.96 cm) wide
28.5 in (72.39 cm) tall
5.218 in (13.254 cm) deep
Uses optional trim ring TR-B4
Optional trim ring TR-B4
Opening: 24.062 in (61.118 cm) wide;
28.562 in (72.548 cm) tall.
Molding width: 1.375 in (3.493 cm)
C-size backbox
(three rows)
24.00 in (60.96 cm) wide
37.125 in (94.297 cm) tall
5.218 in (13.254 cm) deep
Uses optional trim ring TR-C4
Optional trim ring TR-C4
Opening: 24.062 in (61.118 cm) wide;
37.187 in (94.455 cm) tall.
Molding width: 1.375 in (3.493 cm)
D-size backbox
(four rows)
24.00 in (60.96 cm) wide
45.75 in (1162.05 cm) tall
5.218 in (13.254 cm) deep
Uses optional trim ring TR-D4
Optional trim ring TR-D4
Opening: 24.062 in (61.118 cm) wide;
45.812 in (114.775 cm) tall.
Molding width: 1.375 in (3.493 cm)
Trim Rings: 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.
Table 2.1 Backbox Measurements
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