There is a huge difference between the Electrical & the Electronics industry and methods. I have been an electrical contractor/electrician for 26 years. Some of the answers in here are very funny.
Don't ask engineers to give you info on general electrical or installation help. If you ask them how to change a light bulb, you will get 50 different answers & someone will write a long response telling what kind of material the filament is made out of.
MLR