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before i turn it on... need PSU grounding advice

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Surreal

'Surreal please contact Krag ASAP'
Joined
Jun 23, 2003
Location
Virginia, USA
ok

I have made a custom PC case. I removed the case from my PSU. before i turn it on, should i connect the ground of the PSU to the ground on the AC outlet? In other words i forgot to check if the PSU ground was connected to its oringinal casing. I know that a standert metallic PC case is in fact connected the ground of the AC connection through the PSU casing.

get it?
 

CrashOveride

Member
Joined
Jun 22, 2002
Location
Beijing, China
The PSU ground should have been connected to the original casing (it is on all the PSU's I have around anyways). I would say you should but I don't know how important it is... I think I did when I removed my PSU from it's case but I am not sure... I know on AT PSU's the ground doesn't HAVE to be connected... and I have also run PSU's outside of a metal case where the motherboard and other components had no ground other than the ones that are connected via wires & molexs. Basicly, I think it's just good pracitce but not always necissary.
 

larrymoencurly

Member
Joined
Jul 14, 2002
Wouldn't it be safer to connect the PSU case to the computer case, on the chance that the PSU case and PSU ground are separate? Because if the PSU isn't connected to the computer case (or the case isn't made of metal) somehow high voltage leaks through to the low voltage side of the PSU, then the computer could be live with high voltage. I've seen two ATX PSUs where the black wires weren't connected to the PSU case and earth ground, and I don't think it's that unusual because even some Channel Wells/Antecs can be made that way by leaving out a single jumper wire on their circuit boards.
 

CrashOveride

Member
Joined
Jun 22, 2002
Location
Beijing, China
larrymoencurly said:
Wouldn't it be safer to connect the PSU case to the computer case, on the chance that the PSU case and PSU ground are separate? Because if the PSU isn't connected to the computer case (or the case isn't made of metal) somehow high voltage leaks through to the low voltage side of the PSU, then the computer could be live with high voltage. I've seen two ATX PSUs where the black wires weren't connected to the PSU case and earth ground, and I don't think it's that unusual because even some Channel Wells/Antecs can be made that way by leaving out a single jumper wire on their circuit boards.

The PSU's are grounded to the case of the PSU which are then grounded to the case of the whole computer, it is somtimes actually needed when motherboard manufactuerers don't ground their motherboards well. The wires usualy arn't black either, they are most often green with a yellow stripe - perhaps you are confused.