Extron Electronics SMB 303 User Manual

SMB 303 Surface Mount Box • Installation Guide

The Extron® SMB 303 is a low profile surface mount box
compatible with Extron three-gang devices less than

1.5 inches deep.

Rear Cable

Access Cover

Strain Relief Boot

Surface Mount Box

Bottom Cable

Access Plug

Wood Screws

(4 each)

This guide provides basic instructions for an
experienced technician to install the SMB 303 Surface
Mount Box.

The surface mount box ships with the items shown in
the figure on the left. A mounting template is also
included.

Strain Relief Clamp

Cable Wrap

Zip Ties (2 each)

Planning

The box can be mounted on any flat surface convenient for users.

Cables for the mounted devices may be run through the bottom of the SMB 303 (typical for fixed and rotating installations)
or from the rear for most tabletop installations. Cables run through the bottom of the SMB 303 will require an access hole
in the furniture.

Getting Started

Determine the optimum mounting location based on ease of use and cable access.

If cables will be routed from underneath, be certain that clearances under the table are adequate and that cables will not
interfere with furniture, equipment, or legroom.

Direct Furniture Mounting

If mounting the SMB 303 directly to the furniture, locate and drill pilot holes using the included mounting template
(part number 68-1945-01). If running cables from under the table, locate and cut a minimum one inch diameter cable access
hole using the template.

Tabletop Installation (Unmounted)

Tabletop installations require adequate cabling to move the SMB 303 around the table. Cabling will always be from the rear
cable access opening.

Optional Swivel Adapter Kit

If the installation requires a fixed, yet rotational box, use the optional SMA-1 swivel adapter, available at www.extron.com.
When using the SMA-1 (part number 70-747-01) refer to its installation guide
prior to beginning the SMB 303 installation.

Rear Cable

Mount the SMB 303

Mount the SMB 303 to the furniture using the previously drilled pilot holes.
Wood screws (#8 x 3/4 inch) are provided for wooden table applications.

NOTE: If cables will be routed through the bottom cable access opening,

remove the hole plug before mounting the SMB 303.

Access

Bottom Cable
Access

(4) #8 x 3/4"
Wood Screws
w/Washers

SMB 303 Surface Mount Box • Installation Guide (Continued)

Cable the SMB 303

Cabling must be done prior to mounting devices on the SMB 303.

NOTE: Some wiring slack is required for installation and

removal of devices.

Cabling from Underneath

1. Install the rear cable access cover into the rear cable

access opening using the provided screws.

2. Bundle the wiring using the provided cable wrap and

feed it from under the furniture through the bottom
cable access hole.

3. Secure the cable with one or more zip ties (see inset at

right).

Rear Cable
Access Opening

a Cable Wrap

d Strain Relief

Clamp

Cabling from the Rear

1. Bundle the wiring using the provided cable wrap

2. Trim the strain relief boot to fit the bundle of

3. Slide the strain relief boot over the wire and cable

4. Place the strain relief clamp into the boot and

5. Secure the wires and cable wrap with a zip tie (see

a Rear Cable

Access Cover

and feed it through the rear cable access opening.

wiring and cable wrap diameter.

wrap and into the cable access opening.

fasten with the provided screws.

below).

c Zip Tie

b Cable Wrap

Strain Relief Boot

b Cut to proper size.
c Slide over wiring

and cable wrap.

Zip Tie

Connect and Mount the Devices

Once cabling is secure, connect the devices and mount them to the SMB 303 according to the mounting instructions
included with each device.

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68-1944-01

Rev. A

10 10

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