Two K8060's in one chassis?

What precautions do I need to take in installing two K8060’s in one chassis? Do the earth connections of each need to be isolated? I realise that I need to isolate in terms of two transformers etc but I can’t understand whether the Earth connections need to be isolated.

I have just tracked down the fuse blowing issue. It seems to be earth related as you suggested but I need to understand how far I need to isolate two in one chassis.

Has anyone else successfully attempted this?

Thanks

For best results, make sure they do not have anything in common.