We have pretty good electrical wiring as an electronics hardware lecturer has recently changed certain wiring. Recently at one switch box in the mid-point of the house electrical wiring, when a neutral wire was disconnected, the whole house electrical supply got disconnected for a reason I don't understand. And, whenever a small load is connected, the voltage drops, lights dim, and certain devices like the TV stop working!
Can anyone diagnose the problem? Some friend suggested a loose contact with the neutral. Could this be the culprit?