Date: Sun, 25 Oct 2020 18:51:45 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: freebsd-questions@freebsd.org Subject: Re: What is the "better / best " method to multi-boot different OSes natively WITHOUT VirtualBox(es) ? Message-ID: <abdf821c-db71-dee5-36a9-a003224dd7f3@holgerdanske.com> In-Reply-To: <20201025225215.65cfca64@archlinux> References: <CALMiprbGBaSJQUAA=1HDZAjvsVNK7dqB_5mBb5DKzV16F3hxHg@mail.gmail.com> <20201024111010.5c867e8540a369b826d26703@sohara.org> <20201025065025.6a13dc89@archlinux> <24469.26288.47199.882303@jerusalem.litteratus.org> <20201025135437.35b592a5@archlinux> <c8cbc8c1-2e05-d57f-41de-8e393fa8fc90@holgerdanske.com> <20201025225215.65cfca64@archlinux>
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On 2020-10-25 14:52, Ralf Mardorf wrote: > On Sun, 25 Oct 2020 11:39:48 -0700, David Christensen wrote: >> On 2020-10-25 05:54, Ralf Mardorf wrote: >> Please explain how galvanic isolation relates to electrostatic >> discharge mitigation. > > That's a misunderstanding. > >> Please explain the risk(s) associate with antistatic wrist straps. > > IMO it's a risk for a human being to wear an antistatic wrist strap, > when getting in touch with gear that is connected to the mains. > > IMO if the gear isn't directly connected to the mains, because an > isolating transformer grants galvanic isolation, an antistatic wrist > strap isn't a risk for a human being. > > An antistatic wrist strap protects the gear against static charge, but > might be risky for a human regarding potential equalization, assuming > something should be fishy, such as a hot metal case. Once the human > touches the hot metal case a fault current breaker should detect that > something is missing, but galvanic isolation is way more secure than a > breaker that probably is missing that something is missing. > > Actually the fault current breaker should already do it's job, when the > metal case is hot, already before a human does touch it. If it doesn't, > then touching the metal case might be dangerous with or without > wearing an antistatic wrist strap. > > However, galvanic isolation is absolutely safe, unless getting in > contact with both conductors, which is impossible in our scenario and > even very unlikely when repairing gear. I disagree with several of your points. But, as the subject involves risk and liability, I advise any readers of this thread to hire qualified professionals if they need help with their electrical systems. David
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