Originally Posted by Jack E
It takes four years to become qualified because there is alot more to trades than the small tasks you refer to.
A sparky wiring a house or a fridgy installing a small domestic A/C is like a woodworker being able to glue a butt joint together.
You have referred to the simplest of tasks.
As a sparky I agree that wiring a house is simple, you could train a monkey to do it. The question is, you may be able to wire an RCD in accordance with the regulations but do you know why it is done that way and how the device works, what will go wrong or work differently if you stray from the regs.
You may be able to wire a house but how would you go programming a PLC, are you any good at vector analysis, what do you know about a VSD driving an 11000V 12 mega Watt motor that moves 800 tonne?
As far as the fridgy work goes, how are you on the procedures and regs there, do you know anything about pressures, boiling points, heat loading, enthalpy?
Anybody with a bit of nouse can make something work.
The key is making something work efficiently, effectively and economically.
Cheers, Jack