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120V AC with 5V DC on the same board

Former Member

Hi I'm an eagle newbie so bare with me. I'm trying to design a wireless relay switch that flips a relay controlling whatever is plugged into the wall(120V AC). The relay gets flipped by a 5V DC signal. I was wondering what sort of things should I avoid when designing the board in eagle. For example, does it matter if the 5V wires cross the 120V wires as long as they are on different layers? Should I just keep the two completely seperate on the board? Any other tips you guys would have would be greatly appreciated thank you.

  • 0

    Am 29.07.2013 03:29, schrieb Sayed Amir:

    Hi I'm an eagle newbie so bare with me. I'm trying to design a wireless

    relay switch that flips a relay controlling whatever is plugged into the

    wall(120V AC). The relay gets flipped by a 5V DC signal. I was wondering

    what sort of things should I avoid when designing the board in eagle.

    For example, does it matter if the 5V wires cross the 120V wires as long

    as they are on different layers?

    IMHO not a good idea

     

      Should I just keep the two completely

    seperate on the board?

    YES, with as much distance as possible. Avoid minimum distances because

    if the board gets dirty insulation decreases...

    Use relays with a good physical separation between coil and contacts.

     

    Any other tips you guys would have would be

    greatly appreciated thank you.

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/84866#84866

     

     

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

  • 0 in reply to autodeskguest

    Hi Sayed,

     

    I agree with Joern, basically as much separation as possible. If you're a newcomer to this, you may want to read up, and examine other products to see how they are wired;  Anything a newcomer creates probably wouldn't past a safety inspection, and could be a hazard to you and others, just so you know.

    See this discussion for some reasons why.

  • 0 in reply to shabaz

    Hi, thank you for that link it was very helpful. I was wondering if you could give me more information about an off-board relay. Where would the relay actually go? Is it just some other board that a relay goes in that can handle the mains?

     

    Maybe giving some background of what I am trying to do would be helpful. I am trying to control my hydroponic lights(up to 1000 watts) remotely. It's a pain when my lights go out or aren't on and I don't know about them. I have the circuit built out and it successfully does what it's supposed to do(well I haven't tried 1000 watts just regular lights), now I want to get the board manufactured and put it in an enclosure that I can just plug my lights in.

     

    A

  • 0 in reply to Former Member

    Hi Sayed,

     

    I'll send you a PM with some tips for your design - not sure I want to encourage people to do this, so the message sent will be "informational" only.