Depends on application.

500vdc is getting up where it's looking to bite. It'll arc if you're not careful and get too close and grab your hand then bad things are happening.

400vdc is still going to kill you if you touch it, but it isn't trying to jump off the rails and grab you.

Valve amplifiers are fantastic fun but holy shit if some of them aren't scary as shit on the inside.

Sketch as.

Thanks though that video was TL;DW

Is this long video trying to explain the concept of 3 phase?

Because we have that too at 415v

Cries in 60hz Japan

Just get some white flow coat and hardener.

Clean out the chip so there's something for the flowcoat to adhere to, bunge it in, let it dry, sand it with 180, 240, 400, 800 grit then buff and polish.

Reading "an exceptionally high voltage (220v)" from a 240v country where the actual voltage is usually hovering around 255v at the outlet...

Dafuq are you low voltage lot on about?