On Sun, 8 Feb 2015 20:53:28 +0100, Ralf Mardorf wrote: >On Sun, 8 Feb 2015 09:06:40 -0800 (PST), Len Ovens wrote: >>It appears we have power coming from two power entrances with two >>different earth grounds to the panels. > >I experienced potential difference for the ground in old buildings >between two main sockets, less than 3 meters difference between those >sockets, both fed by the same power, coming from the same fuse and >connected to the same concrete-footing ground electrode. > >Even if the power should come from two different sources, one building >should have one concrete-footing ground electrode for ground, so in >theory there shouldn't be a potential difference. > >Buildings sometimes don't care about school books. IOW care about creeping current from washing machines and dishwashers and similar issues. My dishwasher does suffer from creeping current. You can measure it, but you don't get an electric shock. However, things similar to that and other strange seed happens in reality. Ground between two mains sockets very often is not neutral, for what reason ever. We are living in a real world, not in school. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
