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Old 12-19-2011, 04:19 PM   #1
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What wire size is standard for the 24V side of things?

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Old 12-19-2011, 04:24 PM   #2
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http://americanhvacparts.com/Merchan...&Store_Code=AM

even if you only have four wires connected at the stat, buy five wire. having one extra wire is always good.

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Old 12-19-2011, 04:30 PM   #3
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[quote=raleighthings;797728]What wire size is standard for the 24V side of things?[/quo
the answer to your question is 18 gauge
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Old 12-19-2011, 04:32 PM   #4
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yep 18 guage 5-conductor
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Old 12-19-2011, 04:45 PM   #5
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18 ga if it is not to far
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Old 12-19-2011, 06:22 PM   #6
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OK. Now please define "far".
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Old 12-19-2011, 06:56 PM   #7
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standard house......no worries............now if you live in a 400 room mansion.....different story
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Old 12-19-2011, 07:09 PM   #8
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Yes. V=IR
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Old 12-19-2011, 07:41 PM   #9
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Quote:
Originally Posted by raleighthings View Post
Yes. V=IR
if that's the equation for voltage (ohm's law) it's E, not V.


there's a thing called amperage drop when it comes to electricity. the further the wire the more drop. why too far is important but I've never had an effect concerning stat wire. I have had issues with 100' extension cords and vacuum pumps and electric saws. They simply wouldn't turn on, I had to use my 50' cord.
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Old 12-19-2011, 08:03 PM   #10
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When did it change? When studying EE it was V. And i for current in one class then i for square root of -1 in next. Then j for that in next.

Anyway V=IR gives you the voltage drop once you calculate the resistance of the wire. Which for HVAC use under 50 ft is usually treated a 0 ohms and thus 0 volts drop. It's more of a rounding error in this case.
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Old 12-19-2011, 08:09 PM   #11
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I actually think it can be either. In school the instructor used E but on wikipedia it's (still) V.
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Old 12-19-2011, 08:15 PM   #12
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In my Refrigeration and Air Conditioning Technology book, newest version aka The Bible, it's E.
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Old 12-19-2011, 08:25 PM   #13
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Old 12-19-2011, 09:08 PM   #14
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