There is a big difference between a domestic electrician and an electrician that works on all types of jobs, domestic jobs tend to be easy, but working in a industrial situation is challenging as you are faced with different situations, dangerous ones at that. For example fault finding in the house is pretty easy, there are few circuits and no dangers to face, if in doubt you can turn off the whole house, but in a factory, there is many circuits going all over the place and you can't turn off something that you don't need to.

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