Back in the days of old earth electrical equipment was a lot dearer with reference to wages ie a weeks wage was ÂŁ250 but a wylex board was ÂŁ120 today its ÂŁ500 and ÂŁ75 so then a few guys skipped on the earth sleeving which was expensive because the manufacturers thought you could not do without it hence why some sparks used red or black sleeving and if you were lucky they put a bit of green tape on it or they even just put green tape on the earth. In other words yes this is not acceptable today but it was the norm 30 years ago and no I have never done it as I was in the industrial commercial sector and only touched domestics for me and family at the time.
Here endith the lesson