Wall chaser from angle grinder - video

[Frank S]

That is a lengthy bit of exposed copper. What is going to cover those long twists?

Being an electrician, I'm always interested in the way the work is performed in other countries.

depending on the country it may be trimmed and an insulated terminal sleeve placed over it then a screw is tightened to hold it in place
Another country may double it back on itself then insulate it.
since the advent and improvement of heat shrink tubing has become popular and in much thicker tubes allowing it to meet the +600v insulation quality required in many countries it could be they will use that.
the contractor may be required to leave the twisted ends exposed until a visual inspection is preformed by the building inspector
And inspected again after insulation is installed