Wiring Sentinel HPLC-8T help!!!!

droopy107 said:

A neutral is just a direct pathway to ground that allows electricity to flow to ground in a 120v system without allowing equipment bodies to be part of the circuit. As long as you don't need 120v for the controller 2 wire plus ground is sufficient. However, If the controler diagram calls for 3 wire plus ground, you have 120v circuits in the controller and without using the ground as a neutral too (bad idea) the controller wont operate correctly, if at all.

Long story short, wire it 3 wire plus ground. The light circuit won't have a neutral through the controller so don't sweat that part.

I'm assuming you are in the states and not Europe.

Here is a decent explanation if you want a more complete understanding.

http://diy.stackexchange.com/questions/33602/why-do-240v-circuits-not-require-neutral

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Ramos015 said:

Yes states. The controller is wired 240. All the outlets 240. There is a mechanical timer built in.

https://growgps.com/products/hplc8t/

That's it

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droopy107 said:

If you click on the link you provided and pull down to the specs, you'll see that the relays have a 120v control circuit. That's why the neutral is called for. Definitely go with the 3 wire plus ground.

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droopy107 said:

Actually it's for the magnetic coil that actuates the relay, But the timer may be 120v too, it doesn't say either way in that spec

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