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Thread: 120 Volt or 240 Volt

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    120 Volt or 240 Volt

    Hi
    Just curious
    Looking through posts on the site I see reference's to wiring up for 120volt or 240volt
    I know the UK is nomimal 240volt and the USA is 120volt but I don't understand why anyone in the states would want to wire up for 240volt
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    Re: 120 Volt or 240 Volt

    It allows you to use smaller wire since the current is less. Power is voltage times current. So if you double the voltage you halve the current.
    Also, some motors run more efficiently with 2 phase electricity.
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    Re: 120 Volt or 240 Volt

    Still confused
    So would you need to have 2 phase's at your property to increase to 240
    I suspect that isn't normal


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    CJadamec's Avatar
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    Re: 120 Volt or 240 Volt

    Standard residential wiring in the US is single phase 220-240v AC 60hz. We have 3 wires coming from the utility pole 2 hot and 1 neutral/ground. Each hot leg has 110-120v potential to ground. The hot (L1) to hot (L2) voltage is 220-240v. All of our standard outlets are 110v. Any high current appliances, like a stove, dryer or pump, are wired for 220v to keep the wire size requirements down. Every time you double voltage you reduce current by half.
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    Re: 120 Volt or 240 Volt

    That makes more sense to me now but if you add the 2 hot 110-120v surely they must be on different phases because if you add 2 x 110-120v on the same phase you will have 110-120v
    Please correct me if I'm wrong as I'm not an electrician but have a basic understanding


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    Re: 120 Volt or 240 Volt

    In the US the common residential power is split phase so it's essentially two phases 180º apart, so the voltage potential between the two hot legs is double the voltage between each leg and neutral, or commonly referred to as 120/240 volt service.
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    Re: 120 Volt or 240 Volt

    Thanks everyone
    Totally clear now and I won't puzzle about it anymore
    Completely different from the UK


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    Re: 120 Volt or 240 Volt

    There is a nice breakdown of standard US residential power HERE. This explains it better than I can and it has pictures.
    Chuck-
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    Re: 120 Volt or 240 Volt

    Let's just be thankful that Nikola Tesla won the argument over Thomas Edison or else the US would be electrified with DC power as opposed to AC power....


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    Re: 120 Volt or 240 Volt

    AC won because it can be stepped up and down in voltage easier than DC.

    High voltage is easier to transmit because it reduces the wire size needed.

    Just keep AC away from elephants.
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    Re: 120 Volt or 240 Volt

    They're scared of AC power too?
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    Re: 120 Volt or 240 Volt

    They are ever since Topsy...
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    Re: 120 Volt or 240 Volt

    Edison proved that elephants are adversely affected by AC.

    Also, the wing beat frequency of bees is a resonant of 60hz. So, it freaks them out.
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    Re: 120 Volt or 240 Volt

    Quote Originally Posted by JamesW View Post
    Edison proved that elephants are adversely affected by AC.

    Also, the wing beat frequency of bees is a resonant of 60hz. So, it freaks them out.
    Edison would also kill stray animals with AC electrocution in public demonstrations to "prove" AC was too dangerous. He was in a very heated competition with Tesla & Westinghouse.


    Matt
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    Mod Squad pooldv's Avatar
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    Re: 120 Volt or 240 Volt

    Oh, nice. Good thing nobody's ever been killed by DC current. We should switch everyone over.
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    Re: 120 Volt or 240 Volt

    Quote Originally Posted by JamesW View Post
    Edison proved that elephants are adversely affected by AC.

    Also, the wing beat frequency of bees is a resonant of 60hz. So, it freaks them out.
    Do European bee wings run at 50 hz?
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    Re: 120 Volt or 240 Volt

    Quote Originally Posted by pooldv View Post
    Do European bee wings run at 50 hz?
    Legally, bees are supposed to maintain a wing beat frequency that is a harmonic of the national electrical frequency. In other words, the wing beat frequency should be an integer multiple of the fundamental ac frequency.

    However, bees often ignore the rules and do whatever they want.

    Bees are critical to human survival. Without bees, humans would starve to death in about a week.
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    Re: 120 Volt or 240 Volt

    Quote Originally Posted by JoyfulNoise View Post
    Let's just be thankful that Nikola Tesla won the argument over Thomas Edison or else the US would be electrified with DC power as opposed to AC power....


    Sent from my iPhone using Tapatalk
    It's funny, I always think about how things would have turned out if AC didn't "win." Would we have a more distributed energy system that didn't rely on huge power lines crossing everywhere one looks? Would it be less vulnerable to attacks in today's world? Would what we now call "alternative" energy be more commonplace? We certainly wouldn't have the economies of scale benefits or the barriers of change. I can't help but think of all the solar panels producing DC electricity that has to be converted to AC and then back to DC for many devices in our home.

    One thing is for sure, AC is a fine business model for large energy production that allows for repeat customers Don't think I don't recognize Tesla's brilliance, but it's hard to ignore Westinghouse's (or Edison's) motivations!

    oops, that was a little off topic
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    Re: 120 Volt or 240 Volt

    I'd like to see more concept homes being built that have alternative power sources available - that is, the home has it's own solar PV array built into the design to provide energy to the home during the day and then an electrical system that can switch between the two power sources easily (maybe even add in some battery backup systems in the event of a power loss or utilize natural gas powered backup generators). The home would be wired with both 120/240VAC outlets for the larger home appliances (fridge, big TV's, etc) and a parallel system of wiring for 5/12/24VDC applications (device chargers, computers, etc). There is so much automation and sensor technology available nowadays that it's so sad to see homes being built with the same breaker panels and rotary power meters that debuted in the early 1900's....

    and I don't call it "thread hijacking"...I call it "topical evolution"....
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    Re: 120 Volt or 240 Volt

    We are moving more towards a distributed source grid with literally millions of passive essentially solar points producing power. It now appears that over time the main sources of electricity will be very local with the larger plants or sources including batteries both local and regional (pump storage) acting as backup for the local sources. Its much more complex to balance but over time that is where we are going. As the cost for solar drops the big question is going to be how do we build more batteries.
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