Swa to shed?

Question

further to my other question ref extension to garden shed, if was to run swa 2.5mm to power socket should i but 3 or 4 core? i believe it is not good practice to use the outer sheath as an earth so i guess i buy 3core & use

1 for+

1 for -

1 for earth

does that sound right

Answer 1

As above, but + and - refer to DC/battery power, Line/live and neutral is correct!

Answer 2

Yep! that's correct!

It's ok to use the armour as your earth, but I tend to use a core and earth down the armour. Belt and braces if you will.

Answer 3

That should be fine but using the armourings as an earth conductor is fine as long as the SWA is terminated correctly using the correct SWA gland.

Answer 4

I would agree 100% with jayktee9  but would add> where you terminate the SWA at the house fit a double pole switch fuse & a RCD ( if the house hasn't already got one )