Tunnel Master® wbc Installation Guide
Page 25
the neutral side of the device, the device now has both the load and neutral and will turn on until the
load circuit is again broken when the relay stops firing.
If sequential relays will be controlling devices that require the same voltage, jump the required voltage
through the commons using the prefabricated shorting bars provided by ICS. Each terminal jumper
is long enough to connect the commons for six consecutive channels. If a lesser number of channel
commons are to be connected, simply cut off those not needed with pliers.
NOTE: the two pin shorting bar connecting the commons for channels 7 & 8. If the number of
sequential relays using the same voltage is greater than six, then use two or more shorting bars and
over-lap them. Use a wire jumper (D) to connect the voltage from one block of shorted channels to
another block of shorted channels as shown above.
In Figure 19, “Common Relay Output Wiring,” channels 1, 2, 3, 4, 7, & 8 all have 24 V AC connected to
their commons and will provide 24 V AC to the piece of equipment that is wired into the normally/
open terminal of each relay. Channels 5 & 6 have been left open for another voltage to be connected
to them.
The prefabricated terminal jumpers should be terminated into the lower common tier and all wire
feeds to the commons and wire jumpers should be made on the upper common tier. This will prevent
the terminal jumpers from covering up any screw terminals.
