Ive said this before and i will no doubt again.
But there are many types of electricians out there.
Domestic, industrial, control, maintenance, lighting etc etc etc.
To assume everyone knows everything is ridiculous.
What I know about e lights i learnt from my apprenticeship in a large factory as part of the maintenance team.
I dont recall it being covered by C&G in any depth, or possibly even at all.
Now if I had been on say a service engineers apprenticeship i would probably never touch a E light, but I could probably make my way through a control panel fault caused by some PLC problem.
Which by the way I personally couldnt do.
So with that in mind which one of us would be incompetent?
Are we both incompetent?
I dont know....