Safety Message To Maintenance Personnel - Federal Signal Corporation SST-MV Instrucciones De Instalación

3. Surface Mounting.
Surface mounting the SST-MV in an NB or NBL box is accomplished using the adapter,
adapter gasket, and the #8-32 x 3-1/4" pan head screws. Use figure 2 as guide.
a. See figure 2. Insert the two #8-32 x 3-1/4" slotted pan head screws into the SST-MV base
at opposite corners.
b. Install the adapter gasket in the adapter, and place the adapter with installed gasket over
the screws inserted in step a.
c. Secure the SST-MV base/adapter assembly in the NB or NBL box with the pan head
screws as shown in figure 2.
4. Concealed Conduit Mounting.
The concealed conduit mounting method is shown in the figure 3. This mounting method is
recommended when an existing junction box or handy box will not accommodate the Model
SST-MV. In order to accomplish this type of mounting, a Federal Model NBL Outlet Box
and an adapter plate are required. A pair of 6-32 and 8-32 flat head screws are included with
the concealed mounting kit to secure the plate to the existing box.
Two 10-32 x 1/4" round head screws are supplied to attach the NBL box to the plate.
An insulated bushing is also supplied to protect electrical leads passing through the center
knockout of the NBL box.
F. Power Connections.
Make sure that the AC power is off.
Select the desired tone by properly locating jumpers J4 or J5. When the unit is to be operated
from an AC source, set the voltage selector switch SW1 to the desired source voltage.
Use only 12 to 18 AWG wire for power connection. Strip no more than 0.25-inch of wire
Connect the AC power leads to the 120/240VAC terminals of the four position connector plug
supplied with the unit by inserting the stripped ends of the wire into the connector as far as
they can travel. Make sure supply lead insulation is flush with connector. If stranded wire is
used, be sure that there are no loose strands outside the connector plug that could touch the ad-
jacent lead and cause a short circuit. Plug the connector into the receptacle provided on the
printed circuit board.
For 24VDC operation, remove the jumper and connect the positive lead to the (+) terminal and
negative lead to the (-) terminal of the four position connector as shown in figure 4.
Choose either AC or DC power operation. Do not try to operate the unit by connecting both
AC and DC power sources at the same time.
G. Service.

SAFETY MESSAGE TO MAINTENANCE PERSONNEL

• Read and understand all instructions before performing any maintenance
to this unit.
• To reduce the risk of electrical shock or ignition of hazardous atmospheres, do not perform main-
tenance/service on this device when circuits are energized.
• Optimum sound distribution will be reduced if speaker becomes clogged with a foreign
substance. Periodic checks should be performed to ensure foreign substances are not packed
into the speaker.
• Any maintenance to the unit MUST be performed by a trained electrician in accordance with
NEC Guidelines and local codes.
CAUTION
insulation from the ends of the power leads.
-3-