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AT20, AT40, AT72D, AT87, AT88 AT TRANSFORMERS
5 69-1641EF
Fig. 7. Secure plate to transformer with mounting
screw.
Fig. 8. Location of mounting holes.
Mounting the AT87 Transformer
Foot Mounting (Fig. 22)
Use screws or bolts through slots in the mounting feet to
fasten the transformer to the mounting surface.
Fig. 9. Foot mounting of AT87 Transformer.
Plate Mounting
The mounting plate allows the transformer to be mounted
on a 4 in. by 4 in. square or 4 in. octagonal junction box.
1. Remove the large center knockout in the mounting
plate (see Fig. 19).
2. Take transformer in one hand and mounting plate
in the other hand. Keyhole slots on mounting plate
should be up.
3. Place large knockout in mounting plate over
primary leadwires and end bell of transformer. The
small tab on the bottom center of the plate fits into
the slot in the transformer mounting feet (see Fig.
20).
4. Insert the mounting screw through the holes as
illustrated.
5. Secure plate to transformer. Do not overtighten
screw.
Mounting Transformer and Plate to Electrical
Box.
The mounting plate can be mounted in 4 in. x 4 in. boxes
with regular and irregular spaced mounting holes, and on
4 in. octagonal boxes.
1. Use the screws supplied with the junction box.
2. Place the screws through the appropriate mounting
holes in the plate and secure the transformer and
plate to the box.
3. Punch out appropriate knockouts for plate
mounting holes, as necessary.
NOTE: Transformer should always be outside of the
junction box.
Mounting the AT88 Transformer.
Use screws or bolts through slots in the mounting feet to
fasten the transformer to the mounting surface. See Fig.
10.
IMPORTANT
MOUNT
TRANSFORMER
OTHER SIDE
M9163
TRANSFORMER
PLATE
O
CTAGON
B
OX
M2065
8
IRREGULAR
4 X 4 INCH
BOX
(MOUNTING
HOLES IN
BOX ARE
SLIGHTLY
INDENTED)
REGULAR
4 X 4 INCH
BOX (2)
IRREGULA
R
4 X 4 INCH
BOX
(MOUNTIN
G
HOLES IN
BOX ARE
SLIGHTLY
INDENTED
)
REGULAR
4 X 4 INCH
BOX (2)
OCTAGON
BOX
LOAD
N.E.C. CLASS 2
USE SCREWS O
R
BOLTS THROUG
H
SLOTS (4) IN
MOUNTING FEE
T
M2065
9
M
OUNTING FOOT (2)
SCREW
TERMINALS
FOR
SECONDARY
CONNECTION
S
L
EADWIRES
F
OR PRIMARY
C
ONNECTIONS