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| Mains RCD for Workbenches 6 or 20mA? |
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| 001:
Why not to use simple isolation transformers? |
| Zero999:
--- Quote from: 001 on December 03, 2018, 10:13:48 am ---Why not to use simple isolation transformers? --- End quote --- Isolation transformers can make it more dangerous, under some circumstances. For example, if a device is connected to an isolation transformer, one might think it's safe to touch a part of the circuit or connect it to an oscilloscope's ground lead, but another part of the circuit is earthed, due to a fault, then bang! |
| amlu:
how about adjustable earth leakage relay? something like that, for example https://www.ebay.co.uk/itm/Broyce-Control-True-RMS-Earth-Leakage-Relay-8A-2P-230VAC-ELRV-30-1-30000mA/123511614271?hash=item1cc1ddab3f:g:YQAAAOSwtc9b0Huq |
| 001:
--- Quote from: Hero999 on December 03, 2018, 12:54:25 pm --- --- Quote from: 001 on December 03, 2018, 10:13:48 am ---Why not to use simple isolation transformers? --- End quote --- Isolation transformers can make it more dangerous, under some circumstances. For example, if a device is connected to an isolation transformer, one might think it's safe to touch a part of the circuit or connect it to an oscilloscope's ground lead, but another part of the circuit is earthed, due to a fault, then bang! --- End quote --- What about transformer AND leakage relay? |
| Zero999:
--- Quote from: 001 on December 03, 2018, 04:38:39 pm --- --- Quote from: Hero999 on December 03, 2018, 12:54:25 pm --- --- Quote from: 001 on December 03, 2018, 10:13:48 am ---Why not to use simple isolation transformers? --- End quote --- Isolation transformers can make it more dangerous, under some circumstances. For example, if a device is connected to an isolation transformer, one might think it's safe to touch a part of the circuit or connect it to an oscilloscope's ground lead, but another part of the circuit is earthed, due to a fault, then bang! --- End quote --- What about transformer AND leakage relay? --- End quote --- What good will that do? The isolation transformer will prevent the earth leakage relay from working. |
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