Isolation transformers have been used ever since I started in electronics aged 7 and I see nothing in my comments recommending novices, or anyone else uses one to protect their lives. I state that I use one on MY bench as a safety system. I know what I am doing and working on live chassis equipment mandates using an isolation transformer as part of the service protocol issue by the OEM !
I have offered no insight into the USE of such a transformer deliberately as anyone wishing to use one needs to fully understand the issues and correct procedures. There are many ways to seriously harm yourself in our business, Darwin awards will continue to be issued to those who misuse equipment.
Maybe times have changed ? Isolation transformers were considered an essential element of a test and measurement bench when I was trained in Maritime elecronics. I own two differential probes for my oscilloscopes, but they do not offer me ANY protection from accidental contact with a live conductor whilst adjusting a component on a live equipment. The one hand in the pocket rule applies of course.
In the UK we mandate the use of isolation transformers in bathroom applications for reasons of safety. They are a well respected safety device.
I do take your point regarding novices though. At no point have I suggested that the isolation transformer detailed here totally protects them from exposure to a lethal electric shock event. Sadly a novice IS capable of making life threatening mistakes. That goes with the territory if working on utility mains equipment whilst it is connected to the supply.
SO FOR ALL NOVICES ... DO NOT USE AN ISOLATION TRANSFORMER WITHOUT FIRST ENSURING YOU ARE COMPETENT TO DO SO.
OK all done, we can sleep well tonight
But seriously, I take no offence at your comment. It is well meaning and justified where Novices are concerned. I accept that. But please do not condemn those of us who have been trained to use such isolation transformers for doing so. There is a whole world out there beyond low voltage electronics that mandates the use of an isolation transformer.
And PLEASE, no one say that the RCCD or ELCB is all that is needed...... if you want to trust your life to one of those, go ahead. It is a safety system but it is a brave person or relies wholly upon such an protector. They work..... most of the time. You do not want to be the unlucky statistic where they do not however.
Fraser