Technical data

Specifications subject to change without notice
© 2007 Atlas Sound Printed in U.S.A. 000905 ATS002120 RevB 4/07 SL10-1098
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone] / FAX [phone]
AtlasSound.com
GENERAL DESCRIPTION
The 300 Series wall cabinets are distinguished by center-section depths of 12" and 15", respectively.
Basic model includes three, 16-gauge CRS sections which include a 2" deep, solid-steel front door,
a 12" or 15" deep center section with adjustable mounting rails, and a 4
1
⁄2" deep rear door. Panel
space openings range from 7 RU to 35 RU (depending on series - see chart on page 1). Enclosures
are equipped with convenient and useful provisions for custom cabinet mounting, wire management,
equipment mounting, and structural support (see below for detailed information). Cabinet is finished
in #962 black epoxy.
Mounting Provisions
Mounting holes, located on the back panel of the rear door, enable the pre-assembled cabinet to
be easily secured to a wall, post, support, or other surfaces for elevated applications (see Fig.1)
These convenient cabinets are designed for right-hand hinging applications, but assemblies
can be inverted 180˚ to facilitate left-hand hinging. Rear section hinges are bolted, not welded,
to ensure easy retrofit capability. The removable pin-type hinges holding the center and rear
sections together facilitate independent pre-installation of the rear section. This feature also
permits efficient surface or recess installation. Models with panel heights of 7 RU, 10 RU and
12 RU have two hinges, while 16 RU, 24 RU and 35 RU panel space cabinets each have three
hinges. Rear sections are now equipped with a 12
1
⁄2" x 12
1
⁄2" square cutout (12 RU, 16 RU, 24 RU
and 35 RU panel height models).
Equipment Mounting & Wiring
All models include one pair of 11-ga. adjustable front-to-rear mounting rails which are tapped
10–32, and manufactured to standard E.I.A.
5
⁄8"–
5
⁄8"–
1
⁄2" spacing. Models with panel space
openings of 16 RU, 24 RU and 35 RU are equipped with center section mounting rail supports (1
per side) which have slotted cutouts for infinite mounting rail adjustments and open raceways to
hold vertically run wire and cable. Smaller models do not require mounting rail supports. Corner
brace supports, which straddle the back and side panel of the rear section (hinge side), also
feature round (1
1
⁄4" dia.) wire access holes for harnessing excess wire. The back panel of the rear
section is equipped with
1
⁄4" deep boss detents which give contractors field flexibility to screw-
mount a plywood, aluminum, or steel subplate (not made by Atlas) for mounting accessories
such as transformers, power strips, and phone relay systems inside the cabinet. Boss detents
are on 12" centers and vary depending upon model height (10 RU, 12 RU and 16 RU panel
space models have four detents 2 RU panel space models have six detents and 35 RU panel
space models have eight detents (see Fig. 2). Note: Model 307-12 does not have provisions for
mounting subplate.
Conduit Knockouts
The 300 Series models have 20 conduit knockouts on the rear section, with the exception of the
307-12 which has 16. Conduit arrays are located at the top and bottom of the back panel (except
307-12 which has a centered array), as well as on the top and bottom back flanges. Panel arrays
consist of four knockouts: two 1" (25mm) standard and two
1
⁄2" (13mm) /
3
⁄4" (19mm) concentric. Top
and bottom flange arrays are comprised of six knockouts: three 1" (25mm) standard and three
1
⁄2"
(13mm) /
3
⁄4" (19mm) (See Fig. 3).
Fig. 1:Rear Section Mounting Holes
Knockouts
(Note: -61 Models have 8 mounting holes)
4.00
MOUNTING
HOLES
4.00
MOUNTING
HOLES
20.82
16.00
MOUNTING
HOLES
BOSS DETENTS
FACILITATE FIELD
INSTALLATION
OF A PLYWOOD,
ALUMINUM, OR
STEEL SUBPLATE
(BY OTHERS)
FOR MOUNTING
ACCESSORIES.
Guide
Plate for
Center
Section
Fig. 2: Rear Section Featuring Optional
Subplate (by others) and Guide Plate