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mikestock's avatar
mikestock
Explorer
Mar 26, 2017

Do I still have an electrical issue or am I okay?

Electrical gurus please help. Do I still have a problem?

My rv is plugged into a 15 amp source on my rental spot in a storage lot. Sitting on a curb and touched a metal part of a hatch door catch. I got a pretty good shock. I took my Simpson 260 and measured between the catch and a 3 “ nail pushed into the ground and got about 75 vac differential. This power source, although it should have a ground fault receptacle, does not.

I started looking for a failure in my ground circuit. I found a 15 to 50 amp adapter had an opening in the ground circuit. After replacing the adapter the problem went away.

I did disconnect the cable from the source and then ran my generator to see if, under this condition, there was any leak to the frame. There was none.

I still have worries that something else is not as it should be to allow voltage to spill over to the coach frame. Have I treated the symptoms without solving the problem or is this something I can ignore?

18 Replies

  • enblethen wrote:
    You have fixed your problem for now!
    I do not care for the hockey puck style adapters. Suggest dog bone style but may have to use two.

    x2 Hockey puck adapters generate too much heat in a small area.
  • Now having a good ground could be masking power leakage to ground that should also be repaired.
  • wa8yxm wrote:
    For a much more detailed explanation.. Take AC Circuit theory at any college.. This is as far as I'm going to type.


    Old-Biscuit wrote:
    Now you are good.


    I've heard all I need to know. My electrical engineering ended with second semester engineering physics. That was 56 years ago.

    When I learned that you couldn't cross a river on a Wheatstone Bridge I swapped to Civil Engineering and steel bridges. What I still remember about capacitors is that they can still bite after disconnected.
  • Get a three light outlet tester asap. First use it on the 15 amp source, then check in the RV.
    Less than $10 at any hardware store.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    First: Let me explain that RV's have many many feet of ROMEX type cable. I will get technical later in this post but ROMEX can act as a voltage divider

    Splitting line voltage (Generally) but the split can be less than even.

    IF the safety ground is open (As it was on your adapter) then. YOu get hot skin

    Fixing the ground, fixed. BUT this does not mean there can not be an additional problem (I would have expected about 70 volts PEAK, not RMS on the skin.. But let me get technical now)

    In electronics we have a device called a Capacitor.. It consists of two metal plates with a dielectric (insulator) seperating, may be air, rubber, plastic, anything that does not CONDUCT electricity. In addition you may have multiple plates in a "Dagwood Sandwich" configuration.

    The symbol is --||-- (The dashed lines are the leads, the uprights represent the two separated plates)

    Well in an AC circuit they act a lot like Resistors (There are also major differences but.. Romex cable .. Electronically,, Thus becomes

    ---||---||---
    With the 3 dashes in the center being the safety ground (The left and right are HOT and Neutral) This 'Divides' the 120 volts into 60 volts rather nicely.

    SO that's the bad news.. Now the good news.

    Since the "plates" (parallel wires in this case) are rather small, and the distance between them rather large compared to a real capicator.. The total capatience is actually fairly low..

    This means the Reactance (Expressed in Ohms, just like Resistance, AC equivlent in this circuit) is very low so only a tiny amount of current can flow.

    Still. can bite a bit.

    For a much more detailed explanation.. Take AC Circuit theory at any college.. This is as far as I'm going to type.
  • You have fixed your problem for now!
    I do not care for the hockey puck style adapters. Suggest dog bone style but may have to use two.
  • No, the problem with the adapter could easily cause your problem all by itself and since your repair fixed the issue, your good.
    There's no reason at this point to think anything else is wrong.