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I have a multiple winding / multiple tap transformer and I need to know if I can use the 0V tap for the taps on the same winding. So the transformer is 320-0-60-320, and I need to combine the 320-0-320 into a full wave restive load to get around 430V DC, but then I also need to get the 60-0 to provide the 60V AC + Ground.

So basically, what I am asking is will the proposed connections in the image below work.

enter image description here

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    \$\begingroup\$ Yes, this should be fine. \$\endgroup\$ – vini_i Nov 20 '18 at 14:52
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Your understanding and approach are correct. The pair of half-wave rectifiers on the 430 V feed means that the ground is correctly and directly connected to the 0 V tap. (The frequent error for novices is to use a full-wave bridge rectifier which separates the 0 V from the DC negative output but your circuit does not fall into this trap.)

Your 60 V output is clearly sharing the same ground as the 430 V circuit so there is no problem there.

Observe the current limit. It is likely that the secondary is all wound with the same gauge of wire so the 0 - 60 V section carries the total current of the 60 V output and the lower 320 V output. (The 320 V winding is only passing current for every second half-cycle so you can take that into your calculations too, if required.)

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