Strange Electrical Problem

[Tim McGann]

On two occasions while connected to 220 power, both times while it was raining, I have had this happen. I will hear a clicking or snapping sound coming from under a dinette seat. There are several electronic devices there but I believe it is coming from the Nord NE350 power distribution unit. The strangest thing is that it momentarily lights up the IR receiver and the side LED strip lights on my Truma Aventa air conditioner. I have immediately unplugged from shore power and it stops. I inspected the cable and both ends appear dry at the connection pins and the plugs seem tight and sealed where the cable passes through. This has never happed when it's not raining so it must be moisture related. I'm concerned that this could cause electronic damage or be dangerous.
Any ideas?

 

[xsparks]

Was it the same mains supply.

 

[Tim McGann]

No, different countries.

 

[Boycie]

Hi Tim, There'll probably be other replies that may help more. My suggestion would be to isolate your Truma Aircon and see if the problem still exists. Hope this helps.
Phil.

 

[Tim McGann]

Thanks Phil. It really doesn't seem like that is the problem, only twice and only when raining, but electrical can be as hard to trace as a leak. It's a new MH and the AC has never even been powered up.

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[jockaneezer]

It's looking to me like it must be the aircon unit ?

 

[Tim McGann]

Okay, any idea why only two times and only when raining?

 

[unclestinky]

Okay, any idea why only two times and only when raining?

Have you tried a different 240 cable, it the only part that would be getting wet.

 

[NicM]

Can you get to were you think it's coming from? Maybe take the cover off and see if you can see anything, if it's a 230v problem it needs looking at!

 

[Tim McGann]

No I haven't but I have inspected the entire cable and there is nothing amiss. It doesn't do it every time so I'm not sure if switching to another would tell me anything unless it did it again. Then I could rule that out I suppose.

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[Tim McGann]

I've looked everything over and it looks normal, nothing charred, no odor. I'm fairly confident that the sound was coming from the Nord 350 unit.

 

[unclestinky]

I've looked everything over and it looks normal, nothing charred, no odor. I'm fairly confident that the sound was coming from the Nord 350 unit.

If rain is causing the issue, it has to be something exposed to the elements. Cable, air con or other.
I’m no sparky though!