Thanks to all for the helpful answers.
It appears to me that there are not a strict recommendations or standards for the T-leads sizing.
Let's look at 6 leads motors, star or delta.
Minimum size of lead should be equal to the cross sectional area of one turn x number of circuits.
The same is the case in 3 leads motors in star connection.
In the case of 3 leads delta connected motor, the minimum size is a cross sectional area of one turn x number of circuits x 2 / 1.73.
Did I go wrong somewhere?
The question is: whether there are reasons that T-leads must be thicker than the above minimum size?
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