Simplex 4100ES Installation Manual page 214

23.2.2 Installing the Back Box(es)
Install the back box as shown in Figure 136. Use the holes in the back box to secure it to the wall.
• For mounting to a wooden wall structure, the back box must be attached with four 1-½-inch-long (38 mm) lag bolts and four ½-inch-
diameter (13 mm) washers.
• The enclosure must be level and plumb when installed. The front surface of the back box must protrude at least three inches from
the wall surface for semi-flush back box installations. Refer to Table 45 and the "Rough Opening" section of the table for semi-flush
installations.
1. The dimensions shown are typical for all surface and semi-flush installations.
2. Use a suitable punch when conduit is required and no knockout is present.
3. Box mounting:
- Minimum 5 inches from an obstruction on the hinged side of the box to permit at least 90 degree angle when the door is open.
- Minimum distance of 3 ¼ inches (83 mm) between boxes.
- Maximum distance of 10 inches (254 mm) between boxes.
4. Conduit A denotes internal panel interconnect harnesses and non power-limited wiring. Conduit B denotes contractor wiring.
5. Do not install any power-limited wiring in the shaded area of the back box as shown in Figure 136. This area is reserved for non
power-limited devices and circuits (for example, AC power, batteries, and city circuits). The non power-limited area is determined
by the internal barriers, but is always below and to the right of these barriers. Do not use the upper right, right, or bottom
knockouts for entrance of power-limited wiring.
6. When the two back boxes are mounted side-by-side, remove the hinge and the lock catch on the second back box (box on the
right). Remount the hinges on the right side of the second back box. Remount the lock catch on the left side of the second box.
Mount the door upside-down so the locks on both boxes are side-by-side.
23.3 Step 2. Mounting Electronics Bays to Back Boxes
Before the system cards can be configured, the system electronics bays must be mounted to the FACU back boxes. This section describes
that process for the master controller cabinet and expansion cabinets.
page 212
Figure 136: Back Box Installation Diagram
4100ES Fire Alarm System Installation Guide
574-848 Rev. BQ