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Answer for USA, Canada and countries running a 60 Hz supply service.
The ballasts have to be connected in parallel with each other. Bring a "hot" circuit wire from the distribution panel breaker to the junction box that is going to hold the switch. This connection will be for 120 volt ballasts but will be the same for any "hot" to neutral voltages.
Connect the "hot" wire to the top screw in the switch.
Run a two conductor cable to the first fixture junction box.
Connect the black wire of this cable to the bottom screw of the switch.
Wire nut the two white wires together and push them to the back of the switch's junction box.
Connect the ground wire around the ground screw in the back of the box and wire nut the two ground wires together.
From the first fixture junction box to as many junction boxes there are, for how many fixture ballasts you want to connect together, install a two wire cable between them. From the first box to the last fixture box, the connections will be black to black and white to white. This also includes the ballast black and white wires.
Connect the ground wires in all fixture boxes as instructed to do in the first switch box.
Pigtail a two foot piece of insulated green wire on the ground wire, in the fixture's junction box, where the two grounds splice together. This is to ground the fixture when it is installed.
Install the switch in the switch box and install the cover plate.
Turn on the breaker to energize the system.
All of the fixtures will operate when the switch is flipped on.
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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