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240 vs 2 120 outlets?

 
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Kahu




Joined: 23 May 2013
Posts: 3



PostLink    Posted: Mon Jun 10, 2013 4:06 pm    Post subject: 240 vs 2 120 outlets? Reply with quote


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So running a 240 line would be kind of pricey for me... Can i just use two 120 outlets that are on opposite phases? I figure using the two hot lines would add up to 240... is this ok to do?

Stan
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kal
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Joined: 12 Dec 2010
Posts: 11116
Location: Ottawa, Canada

Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter


PostLink    Posted: Mon Jun 10, 2013 4:22 pm    Post subject: Reply with quote

If the intent is to build the standard 30A control panel as described on this website then the answer is no.

The 240V outlet required to drive this control panel must be able to supply 30 amps of current which results in up to 7200W of power (240 x 30). This is required to drive a single 4500-5500W heating element at a tme.

A standard 120V outlet only supplies 15A which means it can only supply 1800W of power. Two of them would only be 3600W. It's somewhat of a moot point however as you can't combine power from multiple outlets to drive a single heating element. You could drive two ~1400-1500W heating elements if the panel was completely redesigned to have two power cables and separate heating element control. Still not enough power for most setups which is why 240V / 30A is used.

Something to keep in mind: If you're planning on building the setup as documented here the cost of the 240V / 30A line will be somewhat negligible in the grand scheme of things.

Good luck!

Kal

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