Frequent burning of air conditioner compressors
Any motor will burn out if there is insufficient voltage reaching it.  Or it is overloaded.

Measure the voltage reaching the compressor, easily approximated by measuring at the electrical outlet.  Do this while the a/c is running.  Compare the voltage at the same place without the a/c running.   If the voltage drops significantly (240 v to 210 v), that is a sign of inadequate or poorly installed wiring.   Excellent wiring will barely have any drop (240 to 238 volts).

What is 16 mm aluminum cable?