LEGRAND Wattstopper RT-100 Installation Instructions page 2

1. Prepare the switch box.
2. After the power is turned off at the circuit breaker box, remove the existing wall plate and mounting
screws. Pull the old switch out from the wall box.
3. Identify the type of circuit.
4. In a Single Pole Circuit (see Fig. 2), two single wires connect to two screws on the existing switch. A
ground wire may also be present and connected to a ground terminal on the old switch. A neutral wire
should also be present in the wall box.
5. Only connect the RT-100 to a Single Pole Circuit. The RT-100 is not suitable for 3-way switching. If
the existing wiring does not match the description for a Single Pole Circuit, you should consult with a
qualified electrician.
6. Prepare the Wires.
7. Tag the wires currently connected to the existing switch, so that they can be identified later. Disconnect
the wires. Make sure the insulation is stripped off the wires to expose their copper cores to the length
indicated by the "Strip Gage," in Fig. 3 (approximately 1/2 inch).
8. Wire the time switch.
9. Twist the existing wires together with the wire leads on the time switch as indicated
in the drawing. Cap them securely using the wire nuts provided. See Fig 4.
10. Connect the green or non-insulated (copper) GROUND wire from the circuit to the
GROUND terminal on the RT-100.
11. Connect the power wire from the circuit (HOT) to the black wire on the RT-100.
12. Connect the power wire to the lamp or fan (LOAD) to the red wire on the RT-100.
13. Connect the NEUTRAL wires from the circuit to the white wire on the RT-100.
14. Put the RT-100 in the wall box with the display positioned above the ON/OFF
button.
15. Secure it to the wall box with the screws provided.
16. Restore power to the circuit.
17. Turn ON the breaker or replace the fuse.
18. Make any necessary programming changes. See the Programming section for
information.
19. Install industry standard decorator wall switch cover plate (not included).
INSTALLATION & WIRING
DISCONNECT POWER TO THE WALL SWITCH
BOX BY TURNING OFF THE CIRCUIT BREAKER OR REMOVING
THE FUSE FOR THE CIRCUIT BEFORE INSTALLING THE RT-100,
REPLACING LAMPS, OR DOING ANY ELECTRICAL WORK.
CONNECTING A PROPER GROUND TO THE TIME SWITCH PROVIDES
PROTECTION AGAINST ELECTRICAL SHOCK IN THE EVENT OF CERTAIN
FAULT CONDITIONS. IF A PROPER GROUND IS NOT AVAILABLE, CONSULT
WITH A QUALIFIED ELECTRICIAN BEFORE CONTINUING INSTALLATION.
WARNING:
WARNING:
2
Ground
Figure 2: Typical Single
Pole Switch Wiring
Fig 3: Wire Stripping
Red -> LOAD (power
Black -> HOT (power
from circuit box)
Green -> GROUND
Terminal
Industry standard
switch cover plate
(not provided)
Fig 4: Switch orientation, wire connections
and wall box assembly
HOT (power from
circuit box)
NEUTRAL
LOAD
(power
to lamp)
Strip Gauge
1/2"
12.7mm
to lamp or fan)
White ->
NEUTRAL