I bought this plug-in power monitor four years ago. I have used it all over my house without issue. I should note that it is designed for UK plugs (I'm in Australia), so I've had to use some plug adapters. Because the UK plug adapters are "upside down" compared to australian plugs, could this be switching the polarities?
Yesterday I put it inline with my washing machine plug to test its usage. After I removed the clean clothes, I touched the metal case of the drum inside and received a decent strength electric shock.
I have been shocked before and I would say that this felt like about 50% of the strength of getting shocked directly from the power-point. It was an intense buzzing in my hand which left it sore for 30 mins after.
I used my proximity voltage detector which started beeping as soon as it came near the washing machine drum.
Having removed the power monitor, I've checked all over the washing machine with the voltage detector and it has not detected any power leakage in the drum or case.
4 years ago my washing machine was attached to a power point that burned and melted. I never found out the cause. Here is a picture of the washing machine plug.
Could this be causing the wires to cross in the plug somehow?
Can I safely use my washing machine?
Since there is no leakage detected when the power monitor is removed, can I safely assume that it is the culprit?
Is there any way to test if they Neutral wire is touching the drum when the machine is just plugged straight into the wall and my voltage detector doesn't detect anything?
Best Answer
There needs to be multiple compounding faults for you to get a jolt like that from the tub. The tub should be grounded to earth, but to give you a jolt, it would need to be instead bonded to one of the mains lines. Since your detector is no longer complaining, it must be bonded to the neutral line. While a bad situation, in normal use there are likely no adverse effects from this.
The other thing that needs to happen is a polarity reversal from either the power monitor or one of the plug adapters. For example, if you accidentally got an UK to Argentine adapter, it would appear outwardly to be for Oz, but in fact the neutral and active pins would be reversed. This too is bad, but also usually no adverse effects are apparent.
Now you have active mains power running down the neutral washer wiring, which inappropriately includes the tub. If the tub were properly grounded and active power somehow came in contact with it, the breaker would trip or the fuse would blow. Having been instead bonded to neutral, and now hot due to polarity reversal, two somewhat innocuous errors combine to become a potentially deadly combination!
First identify which device is reversing polarity. Looking at a wall outlet, with the ground pin on the bottom, both UK and Oz outlets have neutral on the right. Anything that switches sides should be destroyed. Not just thrown out, destroyed, as in render unusable.
The washer should be inspected and the connection to neutral identified and removed. It may be simply a wire with worn insulation that needs to be replaced, or something more intentional. It's impossible to say without inspection. The situation has not changed from before. While the tub bonded to neutral cannot ever be called "safe", as long as polarity is observed, nothing really bad should happen. You can still get shocked from this because the neutral and true ground are likely at different potentials, but nothing like the full 220v jolt you got.