I posted this a while back: https://forums.servethehome.com/ind...-switch-circuit-board-charring-burning.46568/
It's unfortunate because as switches they actually worked amazingly well, and have an excellent admin GUI.
I suspect with a proper power supply without such a large stray voltage it would be OK. After thinking it over I also believe grounding the case would actually help, unlike what I originally stated in the post.
Also FR4 (circuit board material) in a metal case is unlikely to spew flames and burn a building down - It will probably just make terrible-smelling smoke. But who knows. With PoE and higher-power devices the stakes are higher.
In any case, I would recommend getting an NCV tester (non-contact voltage tester) to check for stray voltages around your equipment, and eliminate any problems you find. In my case my Bell Fibe (FTTH ISP) modem induced a surprisingly large stray that put 120VAC on all of the Ethernet ports.
It's unfortunate because as switches they actually worked amazingly well, and have an excellent admin GUI.
I suspect with a proper power supply without such a large stray voltage it would be OK. After thinking it over I also believe grounding the case would actually help, unlike what I originally stated in the post.
Also FR4 (circuit board material) in a metal case is unlikely to spew flames and burn a building down - It will probably just make terrible-smelling smoke. But who knows. With PoE and higher-power devices the stakes are higher.
In any case, I would recommend getting an NCV tester (non-contact voltage tester) to check for stray voltages around your equipment, and eliminate any problems you find. In my case my Bell Fibe (FTTH ISP) modem induced a surprisingly large stray that put 120VAC on all of the Ethernet ports.