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Dave,
Interesting. Was this hydrogen cooled by any chance? Blast screens seem rather extreme for an insulation test unless the electrician was prone to outbursts of violent temper, a high voltage megger could do one quite an injury if hurled.
I would not like to be around the installation during the overspeed test but your seeming expectation of a result other than 'still in one piece' or 'extremely broken' would suggest it wasn't this either.
__________________
David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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