Is there like, an ISO standard on how big neodymium magnets can be before they're considered actively hazardous
"mr storylets"
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writer (derogatory). lead designer on Fallen London.
http://twitter.com/notbrunoagain
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in reply to @bruno's post:
All I know is the bigger they get, the more likely they are to fucking explode when they contact each other directly, through sheer blunt force.
There's a little chart here: https://www.first4magnets.com/downloads/63c575842ed44542Universal_Warning_Labels.pdf
I think the tl;dr is that they're all dangerous in different ways (kids have swallowed the small ones by accident and that can be Very Bad News).
Along the way, I found this absolutely incomprehsible webbed page which I am sharing because I don't know what else to do with it: https://www.magnet4sale.com/magnets-for-sale-blog/magnet-strength-chart-gauss-rating-cms-magnetics/
Most of the actual regulation of magnets is about the ones that are small enough to swallow. The reason you wouldn't want to build a neodymium magnet the size of a Buick is mostly that it's hard to do so, the bigger the magnet the more apparent the fragility of the material, and there's no real market/application for it. Just in terms of "largest magnetic fields" you're likely to encounter, most of them will be electromagnets anyway. It's probably not a good idea to put a lot of time, effort, and money into building a very large neodymium magnet that still isn't as strong as the electromagnet at the scrapyard.