Extron electronic CTP150CM Installation and Operation, cont’d, 3 - Attaching a wall box to a stud

Installation and Operation, cont’d

Installation using a UL listed wall box (available from Extron) is recommended for most mounting options, but the optional wall mounting bracket can be used instead. All wall boxes must be at least 1.0" (2.5 cm) deep.

Before using the wall mounting bracket, verify that the installation conforms to national and local electrical codes.

Prepare the site as follows:

1.	If your wall box or mounting bracket includes a paper
	template, cut out the indicated portions of the template.
	If the wall box or mounting bracket does not include a
	template, use the wall box or bracket itself to size the hole.
2.	Place the template, wall box, or mounting bracket against
	the installation surface, and mark the guidelines for the
	opening on the wall or furniture.
3.	Cut out the wall/furniture material from the marked area.
4.	Check the opening size by inserting the wall box or
	mounting bracket into the opening. The box or bracket
	should fit easily into the opening. Enlarge or smooth the
	edges of the opening if needed.

5a. If you are using a wall box, feed cables through the wall box punch-out holes, and secure them with cable clamps to provide strain relief.

Exposed cable shields (braids or foil) are potential sources of short circuits. Trim back and/or insulate shields with heat shrink (figure 2-2).

Screw

Braided Shield

Cable Clamp Metal Wall Box

Install Cable

Foil Shield

Figure 2-2 — Grounding outer braided and foil shields

To prevent short circuits, the outer foil shield can be cut back to the point where the cable exits the cable clamp. Both braided and foil shields should be connected to an equipment ground at the other end of the cable.

5b. If you are using a wall box, insert the wall box into the opening, and attach it to the wall stud or furniture with nails or screws, leaving the front edge flush with the outer wall or furniture surface (figure 2-3). The illustration applies to both two-gang and four-gang wall boxes.

Wall Stud

Installation

Cable

Cable Clamp

Screws or Nails

Wall opening flush with

edge of box

Figure 2-3 — Attaching a wall box to a stud

If attaching the wall box to wood, use four #8 or #10 screws or 10-penny nails. A minimum of 1/2 inch (1.3 cm) of screw threads must penetrate the wood.

If attaching the wall box to metal studs or furniture, use four #8 or #10 self-tapping sheet metal screws or machine bolts with matching nuts.

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