Anti static wrist strap question?

Vindaloovians

Honorable
Dec 6, 2013
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10,690
I heard you need to connect it to the metal on a PSU/case with the PSU plugged in, but I don't want someone to flick the switch on and me to get fried! Any other SAFE ways to connect it? The case and PSU are full painted (Screws on PSU aren't)