A/C interrupts music

[One and a half]

NEC rules cover lightning protection for buildings, although some of the newer regulations with separate ground rods for PV arrays are very odd. So the lightning protection is a different issue. 

 

If you tracked the problem to the aircon's compressor switching in, the switch responsible is wearing out or faulty, one day it won't work at all. In this case you need to talk to your landlord to have this fixed, as it's affecting the test system, most likely an RF spike or worse an AC spike.