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Home Brew Forums > Home Brewing Beer > DIY Projects > Other > rotary switch for ac power?
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Old 12-12-2009, 02:39 PM   #1
tkone
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Default rotary switch for ac power?

hey guys,

i'm trying to find a rotary switch (15a) that can be used for switching ac power -- i want to be able to direct the power to only device at a time through my "control box" since i'm running this off a single 15a circuit in my house, and each device connected draws 15a, so i only want to be able to use one at time, regardless of what my brain may think.

but.

i'm having problems finding this part where it doesn't cost about $100.

any one have any idea? or a different way to select which device receives the power?

i only need three positions -- on/off will be controlled by an illuminated rocker switch.
thanks!


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Old 12-12-2009, 02:55 PM   #2
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How about a single pole double throw switch?

There's a diagram on this page, look for SPDT: http://www.exman.com/switch.html


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Old 12-12-2009, 02:58 PM   #3
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how about using a cheaper rotary switch and relays?
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Old 12-12-2009, 03:00 PM   #4
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SPDT only selects between two devices -- i'm looking for a way to do three.

i could do cheaper switches and relays, but that's way beyond my expertise.

although if someone wanted to help...
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Old 12-12-2009, 03:00 PM   #5
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How many devices are there?

Edit, nevermind, just saw it.
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Old 12-12-2009, 03:07 PM   #6
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Quote:
Originally Posted by tkone View Post
SPDT only selects between two devices -- i'm looking for a way to do three.

i could do cheaper switches and relays, but that's way beyond my expertise.

although if someone wanted to help...
OK this is ghetto but you could use two SPDT switches chained together.
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Old 12-12-2009, 03:49 PM   #7
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I don't think it would be a problem running the march pump at the same time as one of the 1500w elements. I'd use on/off for the pump and then either a On/Off/On switch for the elements or an On/Off (master) inline with an On/On SPDT (element selector).

Here's an on/off/on http://www.allelectronics.com/make-a...-SWITCH/1.html


similar...
http://cgi.ebay.com/LOT-OF-4-ROCKER-...item4cec748bcc
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Old 12-12-2009, 09:29 PM   #8
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cool. and to split the power between the two switches i can just use terminal blocks? or should i just twist the wires together and put on one of those wire twists?

i wasn't sure if i was going to trip a circuit with the pump and the element on at the same time.

i just checked my circuit breaker and they're all 20a breakers which is good to know.
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Old 12-12-2009, 10:10 PM   #9
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I'd use a terminal block with spade connectors for the wiring, it keeps everything much tidier and easier to alter in the future. Also, terminal jumpers work well for branching out a wire. I couldn't find them at a local hardware store so I got them from McMaster, #5566T46.


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