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A-3
Boxes & Covers — Steel City
®
Metallic Boxes
Overview
Guide to Steel City
®
Knockouts, Pryouts, Ears, Brackets and Clamps
Knockouts and Pryouts
Steel City
®
conduit KOs have standard trade size dimensions. KOs are uniform and true
for attachment of cable or conduit connectors. Pryouts for cable entrance are slotted
— a twist with a screwdriver removes them. KOs and Pryouts are precision stamped
to permit easy removal, but remain sufficiently strong and sturdy when not removed.
Outlet Box Ears
Mounting ears support the box independent of the electrical system
attachments. Switch boxes have a fixed ear for old work installations.
Ears for plaster are set
1
⁄16" forward of the box face in position for old
work (modernization), except where specifically noted.
Tapped Holes for Grounding
All Steel City
®
boxes have a 10-32 tapped hole in the bottom
of the box for attaching separate ground wire.
Brackets
Clamps
3
⁄4" Conduit KO
1" Conduit KO
Knockouts
DV Type
Mounts box offset from stud 1
1
⁄2".
6
13
⁄16" long x 1" wide x 1
1
⁄2" offset
MS Type (For Metal Studs)
Mounts to any depth of metal stud,
open or closed side.
2
1
⁄2" long x 1
11
⁄16" wide x
3
⁄8" offset;
Far side support to 4" only
S or B Type
Mounts to face of stud. Used on
switch, handy or square boxes. 2"
long x 2
1
⁄8" wide
T Type
Positions handy box against
the face and side of stud.
5
1
⁄2" long x
7
⁄8" wide
SV Type
Mounts box to side of stud with
positioning spikes.
7
3
⁄8" long x 1" wide x
3
⁄8" offset
CV Type
(Outlet Boxes)
Mounts to flat
side of metal studs
or wood studs.
7
3
⁄8" long x 1" wide
x
3
⁄8" offset
7
⁄8"
1
3
⁄32"
1
3
⁄8"
1
⁄2" Conduit KO
C-5
C-1
C-8
(Loom only)
C-10
C-3
L Type
Used to mount octagon boxes.
2
5
⁄8" long x 3
5
⁄8" wide x
1
⁄4" offset
For Non-Metallic Sheathed Cable and Non-Metallic Tubing (Loom)
UNDERWRITERS LABORATORIES INC. and CANADIAN STANDARDS ASSOCIATION file numbers for individual items
available upon request.
For Armored
Cable
Listing Information for Armored Cable Clamp — Type C-3
Armored Cable (BX) — Steel Sizes 14-2 through 10-3
Armored Cable (BX) — Aluminum Sizes 14-2 through 10-3
MC Interlocked (MCI) — Steel .449–.570 Diameter
MC Interlocked (MCI) — Aluminum .476–.606 Diameter
MC Corrugated (MCC) — Aluminum .375–.515 Diameter
MCAP
™
— Aluminum* .370–.580
Flex Metal Conduit — Steel
1
⁄8" Trade Size
Flex Metal Conduit — Aluminum
3
⁄8" Trade Size
C-3 Clamp Acceptable for Grounding
* MCAP
™
is a trademark of Southwire Company
Eccentric Knockouts
Combination
1
⁄2"
&
3
⁄4" Knockout
Pryouts
Cable Pryouts Always in Pairs
21
⁄32"
V Type
Mounts to flat side of stud.
7
3
⁄8" long x 1" wide x
3
⁄8" offset
“Products listed in this catalog are subject to alteration or discontinuation without prior notice.”