On 01/12/2018 16:05, Roger Hayter wrote:

Very old ones might
use highly carcinogenic oils I've forgotten the name of (but not
inflammable, also used for potting transfomers many years ago), and
apparently in the USA sometimes vegetable oils have been used.


Oil filled transformers do explode!
https://www.youtube.com/watch?v=fzbQjd_Oo4Q


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