P83493 B
Sheet 5 of 7
MOUNTING OPTIONS:
CAUTION:
The following figures show the maximum number of field wires (conductors) that can enter the backbox used with
each mounting option. If these limits are exceeded, there may be insufficient space in the backbox to accommodate the field wires
and stresses from the wires could damage the product.
Although the limits shown for each mounting option comply with the National Electrical Code (NEC), Wheelock recommends use of
the largest backbox option shown and the use of approved stranded field wires, whenever possible, to provide additional wiring room
for easy installation and minimum stress on the product from wiring.
4" SQ. X 2-1/8"
A
FLUSH MOUNTING
4" SQ. X 1-1/2"
BACKBOX
(2) #8-32
SCREWS
EXTENSION RING *
SCREWS
(2) #6-19
ROUND GRILLE
SQUARE OR
(STROBE SPEAKER)
SPEAKER
MOUNTING
PLATE
MAXIMUM NUMBER OF CONDUCTORS
AWG #18 AWG #16 AWG #14 AWG#12
8 8 8 8
MAXIMUM NUMBER OF CONDUCTORS
AWG #18 AWG #16 AWG #14 AWG#12
8 8 8 8
SURFACE MOUNTING
B
(2) #8-32
SCREWS
BACKBOX
(SBB)
SURFACE
PLATE
MOUNTING
SPEAKER
SQUARE
GRILLE
SCREWS
(2) #6-19
(STROBE SPEAKER)
NOTE:
Surface backbox (SBB) in Figure B, is compatible with wiremold and conduit, mounting holes are for single-gang, double-
gang, 4"sq., 3-1/2" & 4" octagon or round backboxes.
MOUNTING PROCEDURES:
CAUTION:
Check that the installed product will have sufficient clearance and wiring room prior to installing backboxes and
conduit, especially if sheathed multiconductor cable or 3/4" conduit fittings are used.
1.
ET70/90 models have an integrated Speaker Mounting Plate.
2.
The Speaker Mounting Plate must be oriented correctly when it is mounted to the backbox. Turn the Speaker Mounting Plate so
that the arrow above the words “Horizontal Strobe” points to the top side of the Speaker Mounting Plate.
3.
First mount the Speaker Mounting Plate to the backbox with the Cone Protector on; after the Speaker Mounting Plate is attached
to the backbox, remove the Cone Protector before installing the grille. Next slide the grille over the Speaker Mounting Plate
strobe and attach with (2) screws.
4. When terminating field wires, do not use more lead length than required. Excess lead length could result in insufficient wiring
space for the signaling appliance.
5.
Conduit entrances to the backbox should be selected to provide sufficient wiring clearance for the installed product.
6.
Do not pass additional wires (used for other than the signaling appliance) through the backbox. Such additional wires could
result in insufficient wiring space for the signaling appliance.
7.
Mounting hardware for each mounting option is supplied.
8. All models can be flush mounted to a 4” square by 1-1/2” deep backbox with a 4” square 1-1/2” extension ring (Figure A).
ET70 models can also be surface mounted to a SBB (Figure B).
9.
Use care and proper techniques to position the field wires in the backbox so that they use minimum space and produce minimum
stress on the product. This is especially important for stiff, heavy gauge wires and wires with thick insulation or sheathing.
