clearing up confusion about earthing

[Professor smith]

I have a question here, I think Carlos (destroyer x) will be able to answer because he has an AKSA.

The question is, can you burn an amplifier if the earthing arrangemets of the two equipment you're connecting are different?

I read a post that an AKSA amp which uses star earth was connected to a double insulated or different earth scheme and it burnt.

Also I would like to understand the problems which can arise from various earthing arrangements.
thanks

 

[AndrewT]

Nope.

No matter which Earthing system has been used (Class1 or Class11) the equipment remains compatible.

If it did not, then the manufacturers would have millions of failed returns under warranty.

 

[Professor smith]

so the worst case scenario is humming noise?

or perhaps safety issues?

 

[ostripper]

This is a timely thread. My questions is about multiple trafo's , do you connect the CT's of 2 or more to the same main star ground ?

With 3 different chassis grounds (heatsinks on hinges) I have a lot of green wire... ,5 PCB stars ( 4 on the amps , 1 huge one
on big supply) and 1 on the main chassis.

or perhaps safety issues?

That is the importance of my query , especially where the PS can kill .
OS

 

[AndrewT]

I have tried and given up using centre tapped transformers for multi channel power amplifiers. I can never get rid of measurable hum (0.2mVac to 0.6mVac) on the outputs.

 

[AndrewT]

so the worst case scenario is humming noise?

or perhaps safety issues?

The worst case scenario is clearly the Safety Issue.

 

[Professor smith]

The worst case scenario is clearly the Safety Issue.

could you please explain to me how this might arise when connecting equipment together each with different grouding schemes?