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Old 12th Sep 2019, 8:25 pm   #13
David Simpson
Nonode
 
Join Date: Mar 2008
Location: Aberdeen, UK.
Posts: 2,838
Default Re: Earthing a part metal enclosure for mains transformer ?

Well Jolly 7, If you are going to run several sub circuits off the T/F, then it would be a good idea to switch & fuse them independently off the secondary windings.
If you are planning starting the motor, as soon as you switch on, then you might well experience a significant initial surge in mains current, so yes - maybe a 2A or 3A fuse in the mains lead to the primary. Still, a 24V motor cant run off the secondary & draw more than 2A approx. from the rectified DC circuitry. In other words - 240V AC mains drawing approx. 0.2A(200mA) in the primary is the max for a 50VA rated T/F. The maths is the same for the secondary winding.
My advice would be to connect a multimeter into the pri. circuit & monitor the AC current being drawn due to your variety of circuits off the secondary.

Regards, David
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