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Why are armoured cable colours different from twin and earth?


joe90

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5 hours ago, HughF said:

I tend to use 3 core (in the correct colours), then earth the armour at one end only, for protection and export the earth to where I'm going. If that's not appropriate and I'm making a TT island then I'll still earth the armour.


Why would you only connect the swa at one end if exporting TN earth? Both ends is a better job imo and keeps your Zs down. 

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