Who is in charge? There is no explicit provision, but it is usually done by electricians, because carpenters don't know the specifications of lamps. Many times, the carpenter has finished and has not seen the lamps. We can't make a few holes at will for users or electricians to match the lights according to the holes. If it's home improvement, it's opened by a carpenter. After all, the number is small. If it's a public outfit, an electrician will have to make a hole. After all, electricians earn money by installing lamps.