wiring 220

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  • jussi
    Veteran Member
    • Jan 2007
    • 2162
    #1

    wiring 220

    I'm curious into what's involved in wiring a garage for 220V? If I go hire an electrician what does he actually do and what type of hardware is involved?

    Also as I understand it the line from the electrical lines is already 220V and just gets reduced down to 110V. Is this correct. If so, where does this process take place. Is there a transformer in the poles or in the box in my house?
    I reject your reality and substitute my own.
    Tags: None
    • Uncle Cracker
      The Full Monte
      • May 2007
      • 7091
      • Sunshine State
      • BT3000
      #2
      No, that's not how it works. Your home actually has two separate 115V lines coming in (they are out of phase from one another). The things in your house requiring 230V are connected to both "hot" lines and the neutral, while the things requiring 115V are wired to only one of the "hot" lines or the other and the neutral. There are many other factors which should be considered when adding 230V, such as load and wire size, circuit breaker size, conduit routing, codes and permit requirements, and even whether your present service is adequate. It may be as simple as adding a double pole circuit breaker to your existing box, or it could be much more complicated. You are doing the right thing to hire an electrician. This is one job where you are better safe than sorry.
      Last edited by Uncle Cracker; 10-14-2007, 08:42 PM.

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        • Jeffrey Schronce
          Veteran Member
          • Nov 2005
          • 3822
          • York, PA, USA.
          • 22124
          #3
          UC is dead on with the detail and the suggestion. Definately want to get an electrician to run the sub panel from your current panel (assuming current panel and supply is sufficient).

          While no one will likely tell you how to DIY, your quesiton can be better answered if you give us a little more detail.

          How many amps is your current service at the main panel?

          Are you running to an attached or detached garage? How far from current box?

          What are your demands, ie how big does new box need to be?

            Comment

            • Tom Slick
              Veteran Member
              • May 2005
              • 2913
              • Paso Robles, Calif, USA.
              • sears BT3 clone
              #4
              to add a 220v circuit to your garage is simply a 220v breaker in the breaker box, then wire over to where the outlet is installed in your garage. as UC mentioned your house already has it, so it is simple for an electrician to hook it up for you.

              one caveat to UC's post is in a 220v circuit, typically there is 2 115v lines and a ground, no neutral. the neutral is added to the circuit if the appliance needs 220v and 110v from the same source.
              Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison

                Comment

                • Uncle Cracker
                  The Full Monte
                  • May 2007
                  • 7091
                  • Sunshine State
                  • BT3000
                  #5
                  Originally posted by Tom Slick
                  one caveat to UC's post is in a 220v circuit, typically there is 2 115v lines and a ground, no neutral. the neutral is added to the circuit if the appliance needs 220v and 110v from the same source.
                  Every 220V circuit in my house has both a neutral and a ground (black/red or black/black, white, green). Maybe that's just the code around here, I don't know.
                  Last edited by Uncle Cracker; 10-14-2007, 09:02 PM.

                    Comment

                    • LinuxRandal
                      Veteran Member
                      • Feb 2005
                      • 4890
                      • Independence, MO, USA.
                      • bt3100
                      #6
                      One thing to think about. When you work with electricity, do you shut it off? If yes, then hire it done.
                      The reason why, even thought the new leg to the outlet you run will be dead until you flip the breaker, there are live ones in the box. Nerves, distractions, and not having someone around with a broom to knock you back, means your better off with a licensed electrician.



                      I wanted to swap out my box, and my electrician refused to do it, because he says I am very capable of it (he has seen me work). I do fear being in the can (where the power line comes into your house) and rewiring the main breaker (always a good idea to replace that line when installing a new box), so it hasn't been done.
                      She couldn't tell the difference between the escape pod, and the bathroom. We had to go back for her.........................Twice.

                        Comment

                        • Kristofor
                          Veteran Member
                          • Jul 2004
                          • 1331
                          • Twin Cities, MN
                          • Jet JTAS10 Cabinet Saw
                          #7
                          Originally posted by Uncle Cracker
                          Every 220V circuit in my house has both a neutral and a ground (black/red or black/black, white, green). Maybe that's just the code around here, I don't know.
                          The 220 that was in my house when it was built (range (not used, it's gas), and dryer (electric for now)) are both 3+ground wire jobs with a 4 conductor recepticle.

                          The 220 outlets I've added inside (table saw, jointer) and the welding circuit I added in the garage are 2+ ground. Now, I may kick myself if/when a new tool comes out that needs 220V for the motor and 110V for the built-in computer and internet connection but for now I'm okay.

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                            • atgcpaul
                              Veteran Member
                              • Aug 2003
                              • 4055
                              • Maryland
                              • Grizzly 1023SLX
                              #8
                              Originally posted by LinuxRandal
                              One thing to think about. When you work with electricity, do you shut it off? If yes, then hire it done.
                              The reason why, even thought the new leg to the outlet you run will be dead until you flip the breaker, there are live ones in the box. Nerves, distractions, and not having someone around with a broom to knock you back, means your better off with a licensed electrician.
                              This is probably a pretty good assessment. I helped my electrician setup my
                              *detached* garage for 220. I had to do some trenching but he made the
                              connections from the subpanel to the main panel. After that, I did all the
                              wiring in the garage myself. I've worked in the main panel and I didn't enjoy
                              it at all. Working in the sub is a different story because A) I can shut off
                              the power from the main and B) it's a lot less crowded in the sub and getting
                              too close to something live isn't as easy. Although I read as much info as I
                              could to install the sub myself, I sleep a lot better knowing a pro did the hard
                              part.


                              Paul

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