It looks like you have a transfer switch that uses wireless normal electricity.
I hope there is no CO for this building if that is a Article 700 transfer switch.
Also I do see any control wiring for the generator.
Sven you got it, the black box is the brains of the transfer switch, most times it will have an exercise clock to run the generator on a fixed schedule
It will also have a lot of settings for different functions.
The voltage at which transfer happens.
Time delays for re transfer and cool down cycles.
As long as the harness is unplugged it will not transfer or start the engine. When the door is closed you would see a LCD display and menu buttons.
[This message has been edited by iwire (edited 02-25-2004).]