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Old 02-07-2010, 02:28 PM   #11
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Hopefully we'll find out soon enough!

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Old 02-07-2010, 03:23 PM   #12
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The "fine print" at the bottom of the listing states that a 110V model will be shipped if you live in the US.

I am not sure I am correct about this, I need a real electrician to chime in here, but I think the Amperage rating will go down with the Voltage rating. I know that would be true for wiring but I don't know if the same would apply to these relays.

I HOPE these work - I would like to get one if they do.
Naw, I am sure the relays are the same regardless of country.
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Old 02-07-2010, 03:40 PM   #13
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Originally Posted by Marsdude View Post
The "fine print" at the bottom of the listing states that a 110V model will be shipped if you live in the US.

I am not sure I am correct about this, I need a real electrician to chime in here, but I think the Amperage rating will go down with the Voltage rating. I know that would be true for wiring but I don't know if the same would apply to these relays.

I HOPE these work - I would like to get one if they do.
Third post in.
http://www.homebrewtalk.com/f51/temp-controller-161493/#post1865497
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Old 02-07-2010, 03:56 PM   #14
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Hopefully we'll find out soon enough!
+1

*waits patiently*
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Old 02-07-2010, 06:09 PM   #15
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Hong Kong is in China.

I wasn't clear. I don't like to buy auctions from anywhere overseas. I feel the same about buying from London as I do from Hong Kong.
I was over there in 88 as well 96 but wanted to be there in late 97 when it was given back to China to see if there was a difference after the takeover.
Rats, (oops thats part of the food chain) I missed that time frame to go back over again.
London also was a big mix of people from around the world and this was back in 87 or 88 during the "storm of the century". Even back then many items were made from theeast sold in their stores. If it weren't for cars and bikes made in Japan English people would be walking.
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Old 02-07-2010, 06:21 PM   #16
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Originally Posted by Marsdude View Post
The "fine print" at the bottom of the listing states that a 110V model will be shipped if you live in the US.

I am not sure I am correct about this, I need a real electrician to chime in here, but I think the Amperage rating will go down with the Voltage rating. I know that would be true for wiring but I don't know if the same would apply to these relays.

I HOPE these work - I would like to get one if they do.
Amperage rating should go down with voltage. Anything that pulls 10amps at 240V will pull 20 amps at 120V and vice versa, if something is rated 10 amps at 240V, it should be rated 5 amps at 120V. At 12V it would fall to .5 amps.
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Old 02-07-2010, 06:58 PM   #17
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Amperage rating should go down with voltage. Anything that pulls 10amps at 240V will pull 20 amps at 120V and vice versa, if something is rated 10 amps at 240V, it should be rated 5 amps at 120V. At 12V it would fall to .5 amps.
Not quite....

For inductive loads, yeah. If you have a 240V n HP motor that is the max rating for that relay then an equal HP motor on 240V will draw more current when under load. The big thing is when the relay engages the contacts may wet from the arc and weld itself closed.
The compressor on a fridge isn't close to that kind of load so it isn't a worry.

As for resistive loads the current rating stays the same regardless of the voltage up to the max voltage rating. A resistive load on 240V will draw more current than the same load on 110.

Is my face turning blue? It's good for 240V up to 10A. It's fine.
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Old 02-07-2010, 09:46 PM   #18
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Quote:
Originally Posted by jimshear View Post
Amperage rating should go down with voltage. Anything that pulls 10amps at 240V will pull 20 amps at 120V and vice versa, if something is rated 10 amps at 240V, it should be rated 5 amps at 120V. At 12V it would fall to .5 amps.
But what about the formula that is used to determine amps?

watts/volts = amps

I have used this a lot to determine the gauge of wiring for a circuit when I built my house and the new shop last year. I am NOT an electrician so I certainly defer to someone with a license. However using that formula I can give the following examples:

1200W/120V = 10A

1200W/240V = 5A

This is why I said that the amperage drops when the voltage increases. I know that is how you figure out what gauge wiring to run for circuits. I would guess this would be true for any conductor.
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Old 02-07-2010, 10:27 PM   #19
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its not a watts/volts thing, its an I²R thing. but that applies for resistive loads, a compressor will draw different amounts of current at different loads. Code rage is probably entirely blue by now...

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Old 02-07-2010, 11:12 PM   #20
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I am.

I^2R=P
V*I=P
P/V=I
Same same...

How to pick a relay.
http://www.leachintl2.com/english/english2/vol6/properties/how8.htm

I still say it will be fine.

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So as I am walking out the door this morning I think to my self:
"self, going to work on Monday is like knowing you're going to get kicked in the nuts. You just don't know when or by who"

Last edited by CodeRage; 02-07-2010 at 11:12 PM. Reason: I not A
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