Extron electronic Mud Ring MR D, Mud Ring MR User Manual

This guide provides procedures for installing and modifying the Extron MR (standard) and MR D (Decora®) series plastic

Rotate doglegs
and insert mud
ring into wall
opening.

Extron
MR 200D

Modular Mud Ring

Surface Mounting
Hole

Dogleg
Screw

Equipment Mounting
Holes

NOTE Do not disassemble the dogleg

from the dogleg screw. Rotate the
dogleg out of the way to insert the
mud ring into the wall.

MR and MR D Series Installation Guide

Dogleg
Assembly

Side
Segment

Top/bottom
Segment

Segment
Assembly
Screw

Top/bottom
Segment

Surface Mount
Screw Hole

Device Mount
Screw Hole

mounting brackets (mud rings).

Mud Ring Components

Each mud ring kit includes an expansion
kit consisting of two small top/bottom
segments that allow the bracket to be
enlarged or reduced to the next larger or
smaller gang size. (See “Modifying a Mud
Ring,” on the next page.)

Figure 1 shows the parts of the
MR/MR D mud rings.

Installation

Determining the installation location

The UL-listed MR series mud rings do not need to be fastened to wall studs, so they can be placed almost anywhere on a
wall or other mounting surface. When you are deciding where to install the device and mud ring, consider the placement of
the cable(s) and access. You may need to install the cables before you install the bracket.

N The mud rings fit properly in hollow wall thicknesses ranging from 1/4" (0.63 cm) to 1” (2.5 cm).

Figure 1 — MR mud ring elements

W The MR series mud rings are UL-listed for low-voltage applications only.

Preparing the site and installing the mud ring using the doglegs

1. See the to-scale cutout template included with the mud ring to determine the cutout dimensions for your mud ring.
Tear the cutout template along the perforations for the appropriate mud ring size.

2. Place the template against the surface to be cut, using a level, if necessary, to keep the template even. Trace around the
template.

3. Carefully cut away the mounting surface
material inside the traced template lines.

4. Test the fit of the mud ring. The doglegs
should fit easily into the hole and the flat
portion should rest flush against the wall.
See the note in figure 2, at right.

5. Rotate all doglegs inward.

6. Insert the mud ring into the hole.

7. Tighten all of the dogleg screws until

the doglegs clamp the mud ring to the
mounting surface. Do not overtighten.

Standard mud rings only: If you are going

to screw the mud ring to the surface, rather
than using the detachable doglegs, mark
the four surface mounting screw holes at
the corners of the mud ring. See figure 2, at
right.

Figure 2 — Installing an MR mud ring

68-1190-01 Rev. D

03 08

MR and MR D Series Installation Guide

Segment Assembly Screws

Small Top/bottom Segment

MR 200 2-gang Mud Ring

MR 200

Modified to be 3-gang Mud Ring

2 Small Top/bottom
Segments

2 Small Top/bottom Segments

Extron Electronics, USA

1230 South Lewis Street
Anaheim, CA 92805

800.633.9876 714.491.1500
FAX [phone]

Extron Electronics, Europe

Beeldschermweg 6C
3821 AH Amersfoort, The Netherlands
+800.3987.6673 +31.33.453.4040
FAX [phone]

Extron Electronics, Japan

Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
+81.3.3511.7655 FAX [phone]

Extron Electronics, Asia

135 Joo Seng Rd. #04-01
PM Industrial Bldg., Singapore 368363
+800.7339.8766 +65.6383.4400
FAX [phone]

www.extron.com

Modifying a Mud Ring

Each mud ring size can be modified to make the mud ring one gang-size larger or smaller (figure 3). You can resize the
mud ring by either adding a top and bottom segment, removing a top and bottom segment (2- through 7-gang size only), or
replacing one size top and bottom segment with another.

Figure 3 — Modifying an MR mud ring

N

Modify the mud ring as follows:

1. As necessary, remove the segment assembly screws that hold the segments together, and add, remove, or replace a top
segment and a bottom segment.

N

2. Replace and install new segment assembly screws as necessary.

Part Numbers

The MR/MR D Series mounting brackets (mud rings) are available in the following configurations:

Name Description Part number

MR 100 1-gang mud ring, black or white 70-519-12 or -13

MR 100D 1-gang Decora® style mud ring, black 70-581-12

MR 200 2-gang mud ring, black or white 70-519-22 or -23

MR 200D 2-gang Decora style mud ring, black 70-581-22

MR 300 3-gang mud ring, black or white 70-519-32 or -33

MR 300D 3-gang Decora style mud ring, black 70-581-32

MR 400 4-gang mud ring, black or white 70-519-42 or -43

MR 500 5-gang mud ring, black or white 70-519-52 or -53

MR 600 6-gang mud ring, black or white 70-519-62 or -63

MR 700 7-gang mud ring, black or white 70-519-72 or -73

The 1-gang mud ring cannot be made smaller.

For example, to modify an MR 300 to be a 4-gang mud ring, add one small segment on the top and bottom. To modify the

same MR 300/MR 300D to be a 2-gang mud ring, replace the large segments on the top and bottom with small segments.

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