From: Harold Hallikainen <harold@mai.hallikainen.org>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 26 Jan 2021 09:59:23 -0800
Subject: Re: [EE] Connecting european device to US main.
Thread-Topic: [EE] Connecting european device to US main.
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I agree that phase to phase will give 240 V (unless you're on a 3 phase
wye, in which case it will be 208 V). Most electronic devices now have
"universal" power supplies that work from something like 100 V to 260 V.

One thought on doing a phase to phase connection is the loss of
overcurrent protection. I think pretty much everything only fuses the hot
side of the power line. That guarantees no high voltage in a device that
blows a fuse (blowing a fuse in the neutral would remove an overcurrent
load but leave line voltage in the device). But, if operating phase to
phase, what about a "neutral" to ground short? There would be no
overcurrent protection at the device (just the branch circuit protection).

I have thought of powering audio equipment that has a universal power
supply from 240 V phase to phase to provide it with "balanced power" that
results in a cancellation of ground leakage current due to the EMI filter
Y capacitors. But, I am concerned about a lack of protection  on one side
of the line.

Harold



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