UK Powered speaker tripped circuits four times over a couple weeks, insulation tester result seems ok, need advice.

reprobate said:

Hello, stating I am not an electrician,

I have purchased a fairly expensive set of used powered studio monitors and I’m concerned about one of them. I was switching the power switch at the back and I’ve switched it off quite poorly where it went back on itself and as it was half way between on and off the whole house tripped, set off the alarms etc. I assumed maybe it was some kind of arc from poorly switching off the power switch.

I then remembered the upstairs tripped the day I received them, and I think I plugged them in around the same time.

Now the other socket in my office is for some reason wired to downstairs, a week after the other incidents I switched off everything at the wall, all on an extension including this speaker, and that seemed to trip the downstairs sockets.

Happened again when I switched the power on at the wall a couple days later.

The device works fine when on, seems to be in a state of powering on or powering off.

I got out the Megger BM80 I’ve got and tested the insulation and it’s at 370MegaOhms both poles to ground.

Can anyone explain what could be happening and what I should be doing. Are there any other tests I can do. Thank you for any advice.

Click to expand...

newfutile said:

When you say tripped what type of device was it,mcb,rcbo,Arc Fault Detection Device or (RCD) Residual Current Device a picture of your consumer unit indicating which device tripped would be handy

Click to expand...

mainline said:

Is it just the one monitor that does it ?
What is the make model ?

Click to expand...

brianmoooore said:

I wouldn't be at all surprised if it turns out that there is nothing wrong with your monitor, other than the dodgy power switch, but you do turn out to have some poor neutral to earth resistance somewhere else on the circuit monitored by the RCD in question.

Click to expand...