6
Federal Signal
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Preparing to Wire the Ex d Flameproof Models
SHOCK HAZARD: To avoid electrical shock, do not connect wires when power is applied. Failure to observe this
warning may lead to serious injury or death.
Ex d units are supplied with a ten-position PCB mounted screw terminal block. This section has wiring instructions for
the flameproof models G-SPK 70 V and 100 V.
The maximum wire gauge is 4.0 mm
2
(12 AWG). The wire must be rated 85 °C or higher. Use only stranded cable to
terminate the loudspeaker. The cross-sectional area of the primary earth (ground) must equal the cross-sectional area of
the phase conductor.
Cable termination for these models should be in accordance with specifications that apply to the application. It is
recommended that all cables and cores be fully identified. Use the appropriate cable gland for the application. Gland
entry threads are M20-1.5 x 6" H.
Tools needed:
•
1.5 mm A/F hexagon key
•
No. 1 Phillips
®
screwdriver
•
Wire stripper
Figure 5
Ex d in/out PCB connections (2.8 V/0.8 V
RMS
)
1
2
3
4
Wiring the Ex d Models
To wire the Ex d flameproof loudspeaker:
1.
Unscrew the M3 hex set screw on the side of the housing one full turn.
2.
Remove the cover from the housing by turning the cover counterclockwise. Three 120-degree spaced reliefs are
provided for a 3/8" spanner wrench if needed. If the cover will not unscrew, back out the set screw a few additional
turns.
3.
Loosen the captive Phillips screw retaining the driver/printed circuit board (PCB).
4.
Slide out the PCB until the terminals clear the housing. Strip the wire insulation 6.5 mm (0.25"). Maximum screw
tightening torque is 0.5 Nm (4.5 in-lb)
5.
The Model G-SPK has five selectable wattage tap settings on the high power setting and five selectable wattage
tap settings on the low power setting. See Table 1 for options and terminal block wiring.
Each terminal block position has in/out connection points.
