On Wed, May 16, 2012 at 01:00:10PM -0500, Chris Caudle wrote: > Which of the equipment (video monitor, computer, active speakers) have > three wire power connections with safety ground connected, and which (if > any) have only two wire connections. Equipment in the US is typically > double insulated and so does not require a safety earth connection, but I > don't know if that also applies on equipment shipped for use on European > 240V power distribution. Most equipment here (Europe) has an earth/ground connection, the exception being 'wall warts'. And some of those (e.g. the one for my new Samsung phone) are so small that I wonder how safe they actually are. But there are other potential problems. The LABEL studio at the Casa della Musica has eight Quested SR8 active speakers. Since they were to be wired to an analog bantam patch bay (which means their input signal can be reconnected while they are switched on) I checked the ground connections - pin 1 of the XLR input to chassis and power input ground. And on three of them that test failed. So I had a look inside. There was a yellow/green wire from the ground connection of the power input socket, the other end of which was soldered to an eyelet clamped between the main PCB and one of the plastic posts supporting that PCB. And in three of the eight cases that eyelet didn't make any contact with the metal bolt holding everything together. Moving the eyelet to the top of the PCB (so is was clamped below the head of the bolt) solved the problem. Now Quested is not a low-budget name, so I was quite surprised to find that their QA overlooked such a basic thing. I wrote to them reporting the problem - and never got any answer. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
