18-02-2017, 01:08 PM
Is that a genuine HP PSU at that price?
The problem has only arisen because of a fault; ordinarily, the leakage of a good PSU will be less than a milliamp. So, I wouldn't bother with isolation transformers, etc. In effect, the RCD has alerted you to a fault that could have got worse - perhaps with serious consequences - if masked by an isolation TX.
Yes, interference reasons mostly. Some laptop PSUs are class 2, but that means the chassis of the laptop ends up floating at half-mains because of leakage capacitance and interference suppression capacitors. Not usually a problem because of the very high source impedance, but it did catch one of our presenters out many years ago (long story that I've told several times before).
The problem has only arisen because of a fault; ordinarily, the leakage of a good PSU will be less than a milliamp. So, I wouldn't bother with isolation transformers, etc. In effect, the RCD has alerted you to a fault that could have got worse - perhaps with serious consequences - if masked by an isolation TX.
Yes, interference reasons mostly. Some laptop PSUs are class 2, but that means the chassis of the laptop ends up floating at half-mains because of leakage capacitance and interference suppression capacitors. Not usually a problem because of the very high source impedance, but it did catch one of our presenters out many years ago (long story that I've told several times before).
