[sdiy] should I connect the plug ground to the transformerground?

[Ingo Debus]

Tony Allgood wrote:
> 
> Hi all,
> 
> In the UK, you are not allowed to cut the earth cable anywhere. The
> metal chassis, if it designed to be earthed, must be bonded to earth.

Some gear makes it very easy to disconnect the circuit ground from the
chassis while leaving the connection from chassis to Protective Earth
intact. In my Alesis RA-100 amplifier it took just loosening one screw
to disconnect that cable. Obviously it was made that way just for that purpose.

Other gear isn't that friendly. I remember a Mackie mixer causing
trouble, because the circuit ground was connected to the chassis almost
everywhere (at each jack!). The Ensoniq DP/4 is also such a beast.

Perhaps it's because there are "cheater plugs" available in the US, that
in so many American gear Protective Earth is connected to circuit ground?

Ingo