My problem
Occasionally, I lose power in all circuits of the home (at the same time), for about 1 second (sometimes more, sometimes a fraction of a second).
Power comes back automatically, and none of the switches in my circuit breaker flipped.
Triggers
Happens quite randomly, but only when using any 1 of these 3 devices. I've tested each individually, and any one by itself can cause the issue. I highly doubt all 3 have gone bad at the same time.
A) Yamaha Aventage A870 sound amplifier. Approx 200W continuous, ~600W peak. Double-isolated (doesn't have an earthing connector).
B) BK Elec XLS 200 subwoofer. 275W continuous declared on the back (in reality it's a bit more). Peak probably 900W. 3 prong plug.
C) Cambridge Audio Minx X301 subwoofer. 350W continuous. Peak probably 900W. 2 prong plug.
The issue doesn't always occur when there's sound playing. It has happened twice with no sound playing at all (movie being paused).
I don't listen anywhere near their max volume.
Other home appliances
Electric oven, electric cooker, dishwasher, desktop PC, hairdryer... basically anything else in the home, can be used without problems.
Testing on another circuit
These 3 devices are plugged into the 'flat' wall sockets.
I temporarily moved device A to a kitchen wall socket. Issue still happens.
I've also isolated the 'flat' ring by turning off every other switch in the breaker box. Issue also happens.
UK Power Networks
I contacted UK Power Networks about this, once right after an occurrence so they could check for issues in real time.
They don't see any fault on their side. If the whole phase is bad, 1/3 of my building would be having my issue.
Asking on my building's community forum, nobody has my issue.
I'm in a flat in a large building, so UK Power Networks doesn't handle the final distribution board.
I've notified building management asking to check the internal distribution board, but they haven't come back to me yet.
Electrician visit
I called in an electrician to check. He tested the breaker box, re-tightened everything, even replaced a wire that was suspiciously loose, checked the electric meter. Didn't find any issue.
Issue still persists after the visit. The electrician has no idea what else to do.
Any idea what the problem is? I have no idea what else to do to diagnose or fix this.
The problem is also quite random and hard to reproduce (obviously nothing goes wrong when the electrician's in the home).
Occasionally, I lose power in all circuits of the home (at the same time), for about 1 second (sometimes more, sometimes a fraction of a second).
Power comes back automatically, and none of the switches in my circuit breaker flipped.
Triggers
Happens quite randomly, but only when using any 1 of these 3 devices. I've tested each individually, and any one by itself can cause the issue. I highly doubt all 3 have gone bad at the same time.
A) Yamaha Aventage A870 sound amplifier. Approx 200W continuous, ~600W peak. Double-isolated (doesn't have an earthing connector).
B) BK Elec XLS 200 subwoofer. 275W continuous declared on the back (in reality it's a bit more). Peak probably 900W. 3 prong plug.
C) Cambridge Audio Minx X301 subwoofer. 350W continuous. Peak probably 900W. 2 prong plug.
The issue doesn't always occur when there's sound playing. It has happened twice with no sound playing at all (movie being paused).
I don't listen anywhere near their max volume.
Other home appliances
Electric oven, electric cooker, dishwasher, desktop PC, hairdryer... basically anything else in the home, can be used without problems.
Testing on another circuit
These 3 devices are plugged into the 'flat' wall sockets.
I temporarily moved device A to a kitchen wall socket. Issue still happens.
I've also isolated the 'flat' ring by turning off every other switch in the breaker box. Issue also happens.
UK Power Networks
I contacted UK Power Networks about this, once right after an occurrence so they could check for issues in real time.
They don't see any fault on their side. If the whole phase is bad, 1/3 of my building would be having my issue.
Asking on my building's community forum, nobody has my issue.
I'm in a flat in a large building, so UK Power Networks doesn't handle the final distribution board.
I've notified building management asking to check the internal distribution board, but they haven't come back to me yet.
Electrician visit
I called in an electrician to check. He tested the breaker box, re-tightened everything, even replaced a wire that was suspiciously loose, checked the electric meter. Didn't find any issue.
Issue still persists after the visit. The electrician has no idea what else to do.
Any idea what the problem is? I have no idea what else to do to diagnose or fix this.
The problem is also quite random and hard to reproduce (obviously nothing goes wrong when the electrician's in the home).