Safety Message To Maintenance Personnel - Federal Signal SST-MV Manual De Instalación Y Mantenimiento

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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.

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 120/240 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