I undestand that All NATE Technicians are not equppied with the clauses of National Electrical Code or NFPA 70. But, I'm pertaining to any related mechanical means or root cause of the frequent burn fuses of the AC Unit which can only be resolved by The Certified AC technician.
Just in case the Electrical devices are compliant with the mandates of NEC. Perhaps the electrical devices was originally compliant and plans are checked by professional engineer prior to commencement of the first installation of this AC units.
Other problem that i suspect, the fuses were replace by undersized
rating compared to the original fuse sizes. Better check the old plans or equipment power ratings.
An Electrical Engineer combined with A certified technician is also a must to resolve the issue.
yp5