-3-
c. Secure the SST-MV base/adapter assembly in the NB or NBL box with the pan
head screws as shown in Figure 2.
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 inch 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.
CAUTION
Use only 12 to 18 AWG wire for power connection. Strip no more than 0.25-inch of wire
insulation from the ends of the power leads.
Connect the AC power leads to the 120/240 Vac 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 adjacent lead and cause a short circuit. Plug the
connector into the receptacle provided on the printed circuit board.
For 24 Vdc 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
maintenance/service on this device when circuits are energized.
