What is common in electrical wiring

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  • Опубликовано: 24 дек 2024

Комментарии • 56

  • @YuukiAira-TheAirium
    @YuukiAira-TheAirium 2 года назад +2

    6 years down the line, this video still helped me understand common, thank you!

  • @6lu5ky86
    @6lu5ky86 9 лет назад +2

    The terminal where both the start and run windings on a motor are connected is called common. All of the diagrams I've seen have a contractor on that line as well as the on its way to the other line. Of course you could just use one.

  • @NoGamerLikeThis
    @NoGamerLikeThis 3 года назад +1

    Step one. Understand Line and Neutral in an AC system. Step two, understand that DC terms change to identify that it is different from AC power but the circuit has to function the same regardless. They is a constant line of power on one side, regarded as “line” in AC and “+ 24V” in a DC circuit. The “neutral” in AC, is the “-“ or “OVDC” in DC. And just like AC power, the neutral (- or 0VDC) is bonded to GND at the panel

  • @wiserdaley6624
    @wiserdaley6624 5 лет назад

    Lol not only is Mr Grayfurnaceman funny ( the way he acts lol) but he's also informative and knowledgeable. Thumps up I like this fellow.

  • @okcbreslinfamily
    @okcbreslinfamily 9 лет назад

    funny you mention this. Instead of hooking up the common on a 240V single phase PSC motor - I hooked up one of the speed taps - motor got pretty toasty. so I was using the hi and med-lo speed taps for 240v. Cost me $100 bill. Good video.

  • @robertmunguia250
    @robertmunguia250 9 лет назад +2

    what do you mean by unswitched side of line for the common? great info just need to fully understand concept.

    • @grayfurnaceman
      @grayfurnaceman  9 лет назад +1

      +Robert Munguia On 120 volts, There is the hot (black) and the neutral (white). The hot is usually switched because you would get shocked if you touched it. You will not get shocked when you touch an unconnected white. Hope this helps.
      GFM

  • @tedlahm5740
    @tedlahm5740 Год назад +1

    HVAC terminology. Common, the un-switched side of the 24 volt transformer. (usually white wire)

  • @sbitschy
    @sbitschy 9 лет назад

    Helped me understand it better. Thanks. Looking forward to the next videos on the neutral and transformers

  • @mrod72785
    @mrod72785 9 лет назад

    Good video, I'd like to see one on properly setting an adjustable head pressure contoller and why you picked the temps/pressures to cycle the fan. Seems fitting being that's is winter.

    • @grayfurnaceman
      @grayfurnaceman  9 лет назад

      +Matt Rodriguez I will be doing one on using head pressure to control high and low side pressures. Just have not gotten around to it yet.
      GFM

  • @meerscan9101
    @meerscan9101 9 лет назад

    Example: common in a high bay light ballast for commercial can be neutral for 120 or L2 for 208/240/277

    • @robertmunguia250
      @robertmunguia250 6 лет назад

      refrigeration tech yeah but he just said it supposed to be unswitched. So if it turns into L2 then you would get shocked right!

  • @wendyhubbard1621
    @wendyhubbard1621 5 лет назад

    What if there's only two black wires? I'm trying to replace a switch to an existing box w/ a dimmer light switch & a receptacle, I using a piggy back for ground, can anyone just tell me which screw to use for ground? There's no green screw

  • @scootin123
    @scootin123 6 лет назад

    I checked out your favor video list. I didn't get very far because @ the top of the list was home made power hammer . Love that video

  • @rheidtech
    @rheidtech 9 лет назад +3

    common is called common because it is common to something. usually a common source. common in a 3 way switch, relay, i/o module ect. are most of the time hot or ungrounded and unswitched. could be a common feed, a center tap, or a common ground. depending on the circuit.

  • @philfalz01
    @philfalz01 9 лет назад +2

    thanks for the info very intesrsting have a good new year

  • @ddcws1
    @ddcws1 8 лет назад

    So the common is just the continuing part of the hot line. Like it comes into the hot and goes out the common? Am I on the right track?

    • @grayfurnaceman
      @grayfurnaceman  8 лет назад

      It is. If there is no connection from the common to the source of power, the common will be hot.
      GFM

    • @eumernunez6706
      @eumernunez6706 5 лет назад

      Yes u r

    • @twotimes87
      @twotimes87 4 года назад +1

      Basically 120 volts stepped down to 24 volts instead of hot and neutral you have hot and common thats what i took away

  • @Forge5894
    @Forge5894 8 лет назад +1

    GFM, this video helped me understand this concept a little better, thank you!

  • @scootin123
    @scootin123 6 лет назад

    It sounds like the common wire as you describe it is in a 24 volt DC circuit is :
    1. Connected to the chassis
    2. Is unscathed
    That sounds like the wire down side from a load, exhausted of volts, reading 24 volts voltage drop across the load directed to a ground and that is why it is attached to the chassis. I'm not telling you, I'm asking you
    So what would be the wire that has switches typically in series , thrmostat, pressure switches not connected to the chassis and upstream from the load. Or leading to the load

    • @scootin123
      @scootin123 6 лет назад

      Fooled by auto correct. Number 2 above should read
      2. Unswitched

    • @grayfurnaceman
      @grayfurnaceman  6 лет назад

      Not sure of your meaning. This circuit has no 24 volt portion. The 24 volt circuit in a furnace is produced by a transformer that changes 120 volts to 24 volts.
      GFM

    • @scootin123
      @scootin123 6 лет назад

      This comment Not this one the one above about a neutral grounded conductor could of never been type by me, I ''m no where near that smart. It's an interesting read but I already have an understanding of the netural . And Grayfurnaceman just told me how to idenyify the neutral using a multmeter.
      Now how can I identify a common using a multmeter. The common wire

    • @scootin123
      @scootin123 6 лет назад

      Strike this comment out . It reference a comment that no longer is on this thread the referenced comment on my tablet originally was on the neutral video and some how appeared on this video section

    • @scootin123
      @scootin123 6 лет назад

      grayfurnaceman could you get rid of all my comments posted on this comment section. I'm so confused with my numerous comments I do not know to continue

  • @keithrichards6816
    @keithrichards6816 9 лет назад

    Thanks for video very informative. Also Good to see the man behind the camera

    • @grayfurnaceman
      @grayfurnaceman  9 лет назад

      +keith richards Pretty ugly huh?
      GFM

    • @Okie-Tom
      @Okie-Tom 7 лет назад

      grayfurnaceman but now everybody knows why you call yourself the Gray furnace man!

  • @RalphsHeating
    @RalphsHeating 9 лет назад

    IMO
    The common in a 24vlt circuit is not switched through the safety's because if R was direct and C was switched if a short to ground were to happen anywhere along the common path the unit would still be able to operate without the safety's between the short and transformer.being able to shut unit down.
    This is not a safe way to wire the low voltage circuit.

    • @grayfurnaceman
      @grayfurnaceman  9 лет назад

      +John Heritage However it is sometimes done by manufacturers for several reasons.
      GFM

  • @gonzgarr1592
    @gonzgarr1592 9 лет назад

    good video with nice and simple info

  • @davidmorrow95
    @davidmorrow95 9 лет назад +1

    Love your videos

  • @twotimes87
    @twotimes87 4 года назад

    Made it more understandable thanks

  • @princemike6522
    @princemike6522 5 лет назад +1

    👑 for simple explanation for that can you just say it's a hot/live line 😮

    • @unclemony5939
      @unclemony5939 5 лет назад

      Ur a very smart guy. That’s all he’s basically saying. Thanks to u both.

  • @rolandoguajardo6556
    @rolandoguajardo6556 9 лет назад

    thanks for help us, awsome videos, and happy New year GFM

  • @JohnnyBLC
    @JohnnyBLC 9 лет назад

    Thanks very much. Certainly helpful.

  • @dg1234ify
    @dg1234ify 6 лет назад

    Perfect answering...Geesh!

  • @vivalabirra08
    @vivalabirra08 6 лет назад

    Thanks!

  • @Bluecollarrebel
    @Bluecollarrebel 4 года назад

    Nice👍

  • @deanmartin1966
    @deanmartin1966 9 лет назад

    Good info

  • @lorenzojuarez4971
    @lorenzojuarez4971 6 лет назад

    Common is not a bad word.

  • @Hambxne
    @Hambxne 5 лет назад

    wonderful explanation, but what a ridiculous concept haha. why does such a simple word need to have such a convoluted definition

  • @grantjohnson7679
    @grantjohnson7679 7 лет назад +2

    that was not explained at all

    • @grayfurnaceman
      @grayfurnaceman  7 лет назад

      I do have a grounding and bonding playlist that may help on my channel.
      GFM