Neptunescrown

Hi Guys, I need your help in solving this mystery. I m staying in a condo. My store room where my helper is staying is having the electrical box and wires(which runs inside the pvc pipe) from the whole unit is connected to it. From feb 2015 I m seeing the water dripping from one of the pvc pipes. My above unit had done renovation during December 2014-February 2015. Condo management asked me check the plumbers. Plumbers told it's not plumbing problem and then thy asked me to check if it's a aircon problem. The plumbers and aircon persons who ever came to check this told it's not our problem. So I told the above unit abt the problem and they sent their renovators. They did something and no more dripping. After 15 days my master bedroom aircon started leaking and when the aircon was fixed agin the water started dripping from the same place in my helpers room. Then the above unit brought some other person to check and he did some thing in the above unit and everything was ok for a month. Then my common room aircon started leaking when it was fixed, after 2,3 days again the water started dripping in my helpers room from yesterday night. What could cause the leak? Anyone had similar situation? Or any contacts who could solve this? Any leads on this vl b very helpful. TIA