AMPS? Need Help..

Discussion in 'Electrical Forum discussion & Blog' started by appdude, Mar 14, 2014.

  1. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    So we came across another issue. AMPS. There are 2A, 4A,and 6A. I am completely lost here. Could someone please help?:confused:

    We are doing under cabinet lighting using led strips and the power supply/transformer amps is troubling me.
    Last edited: Mar 14, 2014
  2. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX
    Amps do not mean much, Unless you know the voltage.

    The main thing is to Make sure your power supply can provide enough power, And that the Voltage is correct.


    P = I X E.


    Good Luck on your project.
  3. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    Thanks, I think im going to ditch LED's because they seem a little to complex with the connectors. So i am going to use Utilitech Plug-In Cabinet Xenon Puck Light Kit from lowes insted. Does anyone know how well these work?
  4. houptee

    houptee Member

    Messages:
    186
    Location:
    Monmouth County, NJ
    LEDs will be using way less amps than any other type of lighting, and run at lower temperatures than Xenon or Halogen bulbs.

    What is so confusing about using LED lights? They make ones that plug together very simple, even IKEA has some cool under cabinet LED pucks and strips as well as big box stores.
  5. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    Well, its the extension part of things. There is a microwave in the way and i can't seem to find any extension cable at all...
  6. houptee

    houptee Member

    Messages:
    186
    Location:
    Monmouth County, NJ
    Google search for DIODER LED strip and pucks they have cords to interconnect them you can snake around the microwave.
  7. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    Thanks for the help. But I'm not going to choose dioder because they only have a pack of 4 + There is a short cabinet beside the cabinet and looks like it won't fit. But i MAY choose it. So i made my own kit.

    Led strips (1) : http://www.lightingever.com/12v-led-strip-light-waterproof-300-3528-5m-ww.html
    Cuttable, Cheap, What else?

    Power Supply (3):http://www.lightinthebox.com/ac-100...-supply-for-led-light-strip-cctv_p810737.html
    Im getting 3 because I want keep this as safe as possible. 1 supply is for the small cabinet around the microwave. The second Is for the set of cabinets after the microwave. And the last is for the cabinet after the huge window.

    Switch (3):http://www.leviton.com/OA_HTML/SectionDisplay.jsp?section=48515&page=2

    Well, its pretty self explanatory by this part. I plug the supply's into the plug in switches and and control the lights from there.

    Oh and we can't forget Connector Cable To DC Female Adapter For Single Color (2)

    so any possible problems with this plan?
    Last edited by a moderator: Mar 15, 2014
  8. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX
    As long as you keep each string below 20 Watts that should work fine, using those power supplies. You may want a spare.


    Good Luck on your project.
  9. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    Hmm, 125V for the switch? I thought it was 120v
  10. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX

    A 125V switch is fine for switching 120V.
  11. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    Your supply voltage from the power pole can vary...what we call 120vac, can, and probably sometimes does, vary from maybe 108-132vac or so. The exact upper voltage rating of a power switch, while important, is pretty much irrelevant when designed for the nominal US 120vac circuit. What may be more important is that the contacts of the switch can safely pass the desired current, and when built-in and tested to pass UL specs, it will be okay.


    FWIW, a voltage rating on a switch gets important when you are dealing with higher voltages - you do not want the opened contacts to be so close that the power could arc between them. It takes a pretty high voltage to cause that to happen, and normally isn't an issue at all with our supply voltage.
  12. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX
    Hanging a power supply off of a switch like that, and keeping it plugged into the outlet may become troublesome.

    Especially if used on a daily basis, or gets bumped.


    But it will work.
    Last edited: Mar 15, 2014
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    Simplistic, but if you think of volts as the pressure and amps as the volume of flow in the circuit, it may help. The volts provide the 'push' to move the amps. To determine the actual amount of power used (to get watts), multiply volts by amps.
  14. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX
    You need to only cut the LED strip on the cut line.

    That should be about every 3 LEDs for a 12Volt system.

    Calculate the number of LEDs you need to light, and do not exceed the power supply limit.


    Soldering 101 comes next.
  15. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    No where on the page does it say how many watts per foot the led's take.
  16. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,508
    Location:
    Houston, TX

    It does tell you the Power supply required.

    It is a 12Volt 3 amp. 12V X 3A = 36 Watt.

    So the strip could be a max of 36 watts for 5 Meter length. 7.2 watts per meter. It should be less than that, 20% maybe for good design, or that recommended power supply can get hot.

    3 meters would be about the max length that you could run on the power supply that you posted. 12V 2A 24W. Cutting a strip in half would be about right for that small supply.


    Good Luck.
  17. appdude

    appdude New Member

    Messages:
    36
    Location:
    Ontario
    Just want to make sure before i order the parts. SMD LED connector? Will SMD work with a normal led strip?
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