SWA used as meter tails

[sjl468]

I did some work over the weekend on a house and found that the tails from the meter had been extended through a 60Amp fuse and breaker using 25mm 4 core SWA. It's been terminated under the floorboards (around 10m away) above the CU using a metal junction box. Three of the tails then extend through the box and straight into the mains switch/earth terminal. Live, Neutral and earth obviously. It looks neat and tidy and grommets are used etc. I just want to ask the question, is it ok to do this? I assume they used SWA instead of 25mm twin and earth as it went up through the cavity on the outside wall. The only bit I would say looks a bit unprofessional is that the cores going to the main switch are heavely taped up.
Thanks.

 

[plugwash]

Wiring needs to be double insulated so if the cores from SWA are split out they either need to be in conduit/trunking or have an extra layer of insulation added somehow.

 

[sjl468]

Would the tape be enough or does it need heat shrink tubing? Or any other ideas?

 

[ban-all-sheds]

I assume they used SWA instead of 25mm twin and earth as it went up through the cavity on the outside wall.

Not good.