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Thread: PSU heatsinks electrified?

  1. #11
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    Quote Originally Posted by Stefan Payne View Post
    Ähm, I've yet to see a Heatsink that is not charged...
    So I'd rather not touch them for that reason...

    I don't want to open the HXi and prove it

    We would be indebted to you if you did; it would be useful to know.

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    Quote Originally Posted by ashiekh View Post
    Also scary is how close they are to the grounded shell

    Attachment 3671
    It's about 4mm. Kinda close but unless someone hits it with a baseball bat, it will never touch the shell.

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    Quote Originally Posted by jayjr1105 View Post
    It's about 4mm. Kinda close but unless someone hits it with a baseball bat, it will never touch the shell.
    Still, it would be nice if the heatsinks were not live.

    380V DC is really, really dangerous.

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    Quote Originally Posted by Per Hansson View Post
    This is completely wrong and actually dangerous information on a forum like this.
    Primary side heatsinks are almost always live!
    Maybe a particular topology or just a really shitty PSU. But "always"?!?!

    Primary side heatsinks are usually either floating or tied to primary ground or tied to chassis/earth ground.

    I suppose if the heatsink is floating it could build up a charge through a leakage path but it should also dissipate soon after the power supply is turned off.

    Even looking around the web, I found examples of "often be at mains voltage" but not "always" and even that description didn't provide an example of when this would be an occurrence.

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    You would be the one to ask, how is it for Corsair power supplies?

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    Quote Originally Posted by ashiekh View Post
    You would be the one to ask, how is it for Corsair power supplies?
    Tied to primary ground or earth ground. Not with leakage going to a floating heatsink.

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    All the more reason to buy Corsair

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    Quote Originally Posted by ashiekh View Post
    All the more reason to buy Corsair
    Thanks, but TBH, not just Corsair. Maybe these electrified heatsink PSUs are just really old and everything made recently that's worth its salt has to meet a newer safety requirement that requires the heatsink not be energized. The OP's Bestec IS rather old (note it doesn't have PFC). I can't even tell where the outlet's Earth connection is grounded to.

    Maybe I'm just so spoiled that even what I would consider a cheap PSU is engineered in such a way.

  9. #19
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    I have a lot of old power supplies, I don't actually have any new; so it is good to know about this 'problem'.

    I'll not lose any sleep over this issue, although my house had 'Federal Pacific' circuit breakers, and these really are reason for concern; so I changed those out for some made by Connecticut Electric who make a straight swap alternative.

    http://www.ismypanelsafe.com/fpe.php

    "Federal Pacific Electric Company (FPE) was one of the most common manufacturers of circuit breaker panels in North America from the 1950s to the 1980s."
    Last edited by ashiekh; 03-09-2019 at 10:04 PM.

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    Rm1000x . Pfc heatsink connected with (-) 380vdc . They add small resistor (0 ohm) between them
    Still need a picture? . I have some 1000x dead in my room

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