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G6fylneil · 24th Jan 2023, 10:55 pm

I recall a 13A socket at an industrial unit with a crossed L&N. It went unnoticed for over 30 years, until an extension lead with a crossed N&E was plugged into it.
I've got a 500/750VA RS isolation transformer (looks like a Caroll & Meynell), with nothing plugged into it I get 74V N to E and 46V L to E measured with a Fluke 89IV. It's input impedance is quoted as 10M < 100pf. (Luciens' 289 is probably the same). The earth of my transformer output socket is connected to the transformer supply lead earth, but there is provision to disconnect it.

24th Jan 2023, 10:55 pm	#29
G6fylneil Pentode Join Date: Sep 2011 Location: Coventry, West Midlands, UK. Posts: 210	Re: Isolator Transformer Query I recall a 13A socket at an industrial unit with a crossed L&N. It went unnoticed for over 30 years, until an extension lead with a crossed N&E was plugged into it. I've got a 500/750VA RS isolation transformer (looks like a Caroll & Meynell), with nothing plugged into it I get 74V N to E and 46V L to E measured with a Fluke 89IV. It's input impedance is quoted as 10M < 100pf. (Luciens' 289 is probably the same). The earth of my transformer output socket is connected to the transformer supply lead earth, but there is provision to disconnect it.