In article ,
raden wrote:
You NEVER disconnect the mains earth from equipment.

Well, actually ....

sometimes you do

on a scope - might be naughty, but sometimes necessary

Most decent workshops should have a mains isolating transformer
available. Mine has. ;-)

Haven't looked recently, but they are similar in looks and price to a
110v site transformer - if you want a portable type.

--
*I'm really easy to get along with once people learn to worship me

Dave Plowman London SW
To e-mail, change noise into sound.