MOSFETs heat sinked to case power inverter safety.

Please elaborate.

 

From what I have read, this is a good thermal conductor and a good electrical insulator. So yes, this will be fine for electrical insulation, I was merely unsure whether you were referring to generic grey foam sheet, this would not have worked. Read here, this is where I checked.

I hope this helps,

 

Grounding, this is usually best left to the advice of an electrician, rather than an electronics hobbyist.

I assume that you are familiar with the purpose of an earth return? To enable a more conductive path to earth should the device become hot and the body is touched, ie, an internal short electrifies the metal body with 240 volts RMS relative to neutral, the neutral is connected to earth at the breaker box. A person touching the box should be more resistive than the copper wire going to earth, rendering the device saf(er).

Does the device have any connection to mains? If so it MUST be earthed asap. Whatever you do with earth, I do not think it will protect the FETs. Without the drains connected to the box (the insulator being intact) will the drains be connected to anything?

Is it definetly the drains and not the bodies that are connected tab?

 

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