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Old 12th Sep 2019, 12:21 pm   #7
broadgage
Nonode
 
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
Default Re: Earthing a part metal enclosure for mains transformer ?

I agree that the earth core of the mains supply flex should be directly connected to the metal case.
Earthing only via one of the transformer mountings would probably be fine in practice, but is not regarded as good practice these days.

The supply flex should be fitted with suitable strain relief and a loop or a small length of slack left in the earth core.

I would suggest a 3 amp mains fuse. The 1 amp fuse suggested in an earlier post would in my view be at some risk of blowing due to inrush current.
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