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Welcome. My name is ***** ***** would be glad to assist.
The intellibrite controller actually operates the transformer and then the transformer the lights.
The power will connect to the intellibrite control, then the controller will output to the transformer and
the lights are connected to the transformer.
So, you have hot connecting to the controller
You have neutral connecting to controller and transformer
You have a switched hot from the controller tot he transformer line in
Then the lights connect to the transformers low voltage out black wires
See the picture below, it should help clear up the situation.
Let me know anything further needed,
That is correct, apparently the controller is UL approved without a ground.