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Thread: Voltages

  1. #1

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    Voltages

    How to protect power supply against applying reverse voltage?
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  2. #2
    Steve Pierce's Avatar
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    Mark the positive and negative leads. Battery only goes in one way so make the leads only long enough to install that way.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  3. #3
    wireweinie's Avatar
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    Yup. You can't block stupid. All you can do is reduce the odds of bad stuff happening. Length coding like Mr. Pierce points out. Color coding helps, with red being positive and black being ground (or 'earth' for you guys on the other side of the pond). Also, for some items, connectors with shapes that can only be connected one way, work well. Some circuits such as external power receptacles have a relay wired into them that will not close if reverse polarity power is connected. This is especially important when some one tries to jump start your airplane with a car and clamp type power cables.

    Did you have a specific circuit that you feel needs special protection?

    Web
    Life's tough . . . wear a cup.

  4. #4

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    May be some written warning would also help

  5. #5

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    put a diode on the master switch so it only closes the master relay when polarity is correct. you could also put it on the relay

  6. #6
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by beezerboy View Post
    put a diode on the master switch so it only closes the master relay when polarity is correct. you could also put it on the relay
    that's an awesome idea!!!

  7. #7

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    Quote Originally Posted by beezerboy View Post
    put a diode on the master switch so it only closes the master relay when polarity is correct. you could also put it on the relay
    This is a very logical idea!
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