Just trying to be on the safe side
Household currents aren't to be played around with.
Unfortunately not all AC wall-sockets are grounded as in the past this wasn't mandatory in all rooms. I believe it is now, but this could pose a problem in such situations....Yes, AC-Live voltage can be dangerous.
That's why you need to have the ground wire connected. (Yellow/Green)
And than it's no problem.
I haven't decided on which PSU to get when I finalize my modified and 19" recased STe, but will look further into that when I figure out the total power requirements, physical size available etc. From what I've read those PSUs have really good specs. How do they compare with a standard PC type PSU?Overhead sheet for insulation is just fine.
Arcing or sparks from the switch normall cannot get out of the switch.
Some incident may have caused the marks. But usually not one of the standard components.
And the insulation sheet should prevent the metal from being blackned.
The original sheet is Polyesther, quite flame retardant and sturdy. (Will not schrink when moderately heated)
And if still in doubt, buy a power supply from EXXOS.
The transformer prevents (almost all) dangerous events, as there's no "live mains" on the bottom side of the PCB.
I've just had a look at my STe PSU (a Mitsumi SR98) and noticed it did indeed have a thick (almost 1mm) stiff transparent plastic sheet underneath the PCB. I can get hold of acrylic sheets (plexiglass) which may or may not be too thick (2mm) -are they the same thing as polyester sheets?