Wiring up an Annunciator.
A diagram of the connections for an annunciator with a separate bell is given in [Fig. 57]. Where the bell is contained in the case a terminal will be generally found for connection.
Fig. 57
The figure shows a wire running from the battery to one side of each push button. This is the common return, or battery wire, and saves installing two wires from each push. It should be larger, however, than the rest of the wires, generally about No. 16 B. & S.
All the wires for an annunciator should be run before connecting up. There are different methods of sorting out the wires at the annunciator. One way is to connect the wires (except of course common or battery return wires) to the drops in any order. Then an assistant travels from push to push and presses each button, noting the room numbers and the order in which they were visited.
As each drop falls, its number and order is noted.
Comparing this with the list made by the assistant will show the correct changes to make.
Fig. 58