Date: Sun, 25 Oct 2020 22:52:15 +0100 From: Ralf Mardorf <ralf-mardorf@riseup.net> To: freebsd-questions@freebsd.org Subject: Re: What is the "better / best " method to multi-boot different OSes natively WITHOUT VirtualBox(es) ? Message-ID: <20201025225215.65cfca64@archlinux> In-Reply-To: <c8cbc8c1-2e05-d57f-41de-8e393fa8fc90@holgerdanske.com> 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>
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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.
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