Instrumentation Engineering or Electrical Engineering

I want to start my career in Instrumentation Engineering or Electrical Engineering. In Electrical I get doubts such as if I install transformers/generators , do wiring of apartments, building, the power comes may be utilize in watching TV, that may go to theatres etc. Sometime may be that I have to design electrical circuit for Bar's & restaurant, places of worship's of idol's etc. Am I assisting in sin indirectly by installing electrical wires, bulbs, ac's , switch boards etc... to churches, temples, theatres, stadium, banks etc. In instrumentation I have to deal with robotic technology(robots are to be utilized)? CCTV, fire alarm also come into this stream. I want to do Halal jobs and earn Halal income.