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Filtering 120/240 VAC from dirty supply.

Discussion in 'General Electronics Discussion' started by Leggir, May 27, 2014.

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  1. Leggir


    May 27, 2014
    I like to spend some time each winter in an RV outside of Mazatlan. The site I've been going to for some time has like much of Mexico, dirty power. Mostly high voltage events I'm guessing from high voltage switching. It seems each year that someone's Air Conditioner, Fridge, Stereo lets the smoke out, especially the ones that are closest to the transformer. This year I was the lucky individual that got to spend $4,000 on parts.

    I had a fail once and replace surge arrester that's designed for RV's. Of course it's designed for good systems like are found in most of the US and Canada. Sadly on this ill-fated day, initially the surge arrester tripped and protected the RV. However it blew apart and can't be repaired. I've been looking at some other resettable ones, that are designed for up to 240 VAC 50A. However these merely interrupt the circuit and then have to be reset, meaning when you come back from a couple hours on the paddleboard the RV is hot has Hell.

    What I'd like to build (I'm a Journeyman Electrician) or buy if such a product exists, is one that will send voltage spikes over perhaps 130V on a line to ground, without interrupting the normal operation of the circuit.

    One of the problems in Mexico is corroded grounds or no grounds, so the ideal design would be a box with a cable that can be plugged into the RV receptacle (usually 120VAC/30A). Have an external ground connection point that I can dig in a ground plate or ground rod and connect to. Then have a 120VAC/30A receptacle (240VAC/50A would be better, as I can use and adapter plug where necessary) that the RV can plug into.

    Any help is greatly appreciated.

  2. Leggir


    May 27, 2014
    Figured it out, will use a surge protective device from SquareD, similar to SDSA3650 (except lower voltage). I'll just make it easily replaceable.
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