why sheath earth wire?

For prevention of disease is OK?

Anyway - oharaf - the French seem to get on OK - maybe their electricians are more highly skilled than you..... :D
 
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I was also taught, during my apprenticeship all them years ago, that we sheaf the earth in a box as it can have a cheese wire-like effect on the insulation of other conductors, especially when it's single core.

(Of course, you should be using deep enough boxes and dressing cables in neatly so as to create no tension, but we're not all as perfect as me:)
 
I too suffer from being nearly perfect, and this shows with the incredibly well organised wiring in my back boxes :D
 
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