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Old 09-26-2013, 11:48 AM   #11
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Originally Posted by trent_77590 View Post
No I plan on using 240. I have a few 3-prong plugs that I got for free at work that I plan on using
Then your diagram is not correct. You will need at least H-H-G for 240v only, or H-H-N-G if you want to run both 240v and 120v.
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Old 09-26-2013, 02:39 PM   #12
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How would the diagrm change then? Would the neutral on the diagram just be another hot line?

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Old 09-26-2013, 03:05 PM   #13
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That would work, but I would be concerned about always having a hot line going to the element, with the other hot line controlled by an SSVR that can fail closed. I would strongly consider adding a "master" switch wired to the coil of a double-pole, single-throw, normally open contactor, with both hot lines running through the contactor. That way, when the switch is off, you know your element is off. In my view, that is a more important safety feature than an e-stop shunting to ground, although you could certainly do both.

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Old 09-27-2013, 02:05 PM   #14
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Like this?
http://www.auberins.com/index.php?main_page=product_info&cPath=2_31&produc ts_id=129

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Old 09-27-2013, 07:14 PM   #15
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Yes, assuming that you are bringing H-H-N-G into the panel so you can derive 120v to power the coil. If not, they make one with a 240v coil. You would also wire in a switch to control power to the contactor coil.
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Old 09-27-2013, 07:16 PM   #16
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Another option, less pretty, is using a switch rated high enough that you don't need a contactor.

http://www.homedepot.com/p/Leviton-30-Amp-Industrial-Double-Pole-Switch-White-R62-03032-2WS/100356941

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