( \frac{19.2}{415} \times 100 = 4.6% )

( VD = \sqrt{3} \times 150 \times 16.4 \times 0.0045 ) ( VD = 19.2 \text{ Volts} )

You look at your cable table. 29A means you need a (approx AWG 10) copper cable for the thermal rating.

When in doubt, go one size larger. The cost of copper today is trivial compared to the cost of a trench re-dig, a fire investigation, or a day of factory downtime.