| ??? 11/08/06 10:04 Read: times |
#127545 - Electric shock hazard, double insulated |
My colleagues and I are a little surprised by the limits allowed for leakage current in standards like EN61010. Double insulated equipment tends to "float" at a voltage half way between live and neutral due to the mains transformer leakage capacitance between primary and secondary windings. I've measured stuff at home, e.g. TV set, video recorder, Hifi, and I see 90 to 100 VAC RMS. What shocked me, literally, is that the standard allows 0.5 mA of leakage current! Although none of the individual units exceeded 0.3mA, when they are all connected together by scart cables, antenna cables or audio cables, the leakage currents add up, and can easily exceed 0.5mA!
Does anyone have any thoughts on this? Are the standards wrong? |
| Topic | Author | Date |
| Electric shock hazard, double insulated | 01/01/70 00:00 | |
| What is much? | 01/01/70 00:00 | |
| There is some debate at the moment | 01/01/70 00:00 | |
| So it's not just me | 01/01/70 00:00 | |
| I just read about in 'television' magazine | 01/01/70 00:00 | |
| My DVD player | 01/01/70 00:00 | |
zap? | 01/01/70 00:00 |