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e. Secure bracket to mounting surface with 1/2" diameter screws
appropriate for the type of mounting surface material.
f. Remove eight 5/16-18 x 1-3/4" hex head bolts, lockwashers and hex nuts that secure
cover to housing and carefully lift off cover.
WARNING
Property damage, serious injury, or death could occur if the machined sealing surfaces are
damaged on this product. To maintain the
effectiveness of the explosion-proof enclosure, be careful
to avoid damaging the machined sealing
surfaces of cover and housing.
g. Reattach unit to its mounting bracket with two 1/2-13 hex head bolts, flat washers and
lockwashers previously removed. Position speaker so as to obtain desired sound coverage
then tighten these bolts securely.
h. Before reinstalling the housing cover, read paragraph d in section 3, Electrical Connec-
tions, and make the necessary connections.
3. Electrical Connections.
DANGER
To avoid electrical shock, do not connect wires when
circuits are energized.
National Electrical Code, as well as local codes, must be followed during installation of
these models. All electrical wiring must be routed through conduit and fittings approved for
explosion-proof installations. The use of metal conduit and fittings is required to provide
grounding of the enclosure.
WARNING
Property damage, serious injury, or death could occur if suitable barriers are not provided for
explosive gases and other atmospheres. To reduce
the possibility of explosion when this unit is used in Class I, Group B atmospheres, the conduit
MUST have a sealing fitting within
18-inches of the enclosure. Be sure to refer to the National
Electrical Code or the authorities having
jurisdiction in your area.
a. Connect the audio common leads (-) to the speaker’s common terminal (marked (–)) and
audio positive (+) leads to the (+) SIG terminal (see figures 2 and 3).
WARNING
An uninsulated section of a single conductor must NOT be looped around a terminal and used
as two separate connections. NFPA 72 requires
that the wire is severed to provide electrical supervision
of the connection.
b. Carefully reinstall housing cover using eight 5/16-18 x 1-3/4" hex head bolts,
lockwashers and hex nuts that were previously removed. Verify that all housing and
mounting bolts have been securely tightened.
WARNING
Property damage, serious injury, or death could occur if the housing is not closed properly. To
reduce possibility of explosion, housing cover
must be kept tight (all eight bolts fully tightened)
while circuits are energized.
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