The SMPS below has screw terminal mains entry as line, earth and neutral:

enter image description here

Is its meshed metal cage in general connected to the earth terminal internally? I could check it if I had one but at the moment I don't have such power supply next to me. I also don't see any indication in the datasheets.


1 Answer 1


yes, but I would not rely on that connection to provide a safety ground to a larger assembly.

  • \$\begingroup\$ Because in my case two such supplies are mounted on a metal plate. It means the cages ares shorting the earth terminals of the supplies. Since I dont have access to them at the moment, Im just speculating. See my related question: electronics.stackexchange.com/questions/411211/… \$\endgroup\$
    – user1245
    Dec 8, 2018 at 22:32
  • \$\begingroup\$ It is not clear from your question or this comment what your concern is. \$\endgroup\$
    – Transistor
    Dec 8, 2018 at 22:34
  • \$\begingroup\$ @Transistor If the meshed cages of the supplies are at same potential with their earth terminal, since both power supplies are mounted on the same metal surface that means their earths will remain shorted even though I cut the earth wire between their earth terminals. That was the concern. \$\endgroup\$
    – user1245
    Dec 9, 2018 at 0:24
  • \$\begingroup\$ you want the case earthed regardless \$\endgroup\$
    – dandavis
    Dec 9, 2018 at 2:20

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