Electronics > Projects, Designs, and Technical Stuff
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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