this post was submitted on 28 Dec 2024
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Dull Men's Club

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About half a year ago I bought a used UPS. It didn't have enough output to power my main PC, but it's perfect for my home server and network.

Starting on Christmas eve and continuing even today, my neighbourhood has been getting intermittent brownouts. It's only affecting one phase (house is on a three-phase 240V connection), which happens to be the one powering my network (also all of the light fixtures, stupid Soviet house), and the UPS works beautifully. I didn't lose any of my services even once. Without it, I would probably be reinstalling Proxmox and praying to the RAID gods to restore my hard drives.

"It pays for itself as soon as it is needed" is proven true once again.

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[–] [email protected] 3 points 1 week ago (1 children)

Except Norway, where 3-phase IT is still dominant. TN is only being built in newly established buildings/areas.

IT being phase/phase = 230V, with no neutral wire.
Upside is it being more robust to ground faults, but you lose 11/22 kW possibility on EV chargers. 7,2 kW is max (32A @ 230V).

Looking forward to it being gone, tbh…

[–] [email protected] 2 points 1 week ago

In Belgium it's still widely deployed. Two other downsides are the risk of electrocution with monopolar switches (can't rely on a light switch, not that you ever should but lots of people think "no light = no zappy zappies" then get a nasty surprise), and compatibility issues with some 3-phase appliances that aren't designed to be hooked up without a neutral because they were not sold in an area where 3x230 is common.