It's pretty difficult not to show any copper on the PE bar unless you spend ages trimming the slide-on sleeving perfectly to length. As for those thick neutrals, they look pre-terminated (as supplied with the CU), there's really nothing you can do about that unless you cut off the terminations and add your own ferrules. Most CUs have exposed Neutral and PE bars anyway. With those enclosed ones, you can't judge how far past the screws the conductors are actually inserted (quite a way looking at the Neutral crimps)
They don't look like sleeved PE but wire already sold with the PE insulation, the same as you buy brown, black, red and blue insulated wire.
No, they're sleeved - you can tell from the way it bunches. That and you can see the bare cable in the back..
OK I should had explained better, I'm talking about the 2 thick one on the top right most. The sleeved ones as you said only one you see the copper, the first one. The others are ok, nothing to say.
But whatever I'm just being picky. I try not to leave that much copper being shown, normally less than 2mm from the terminal, enough to see that I'm not pitching the insulation with the terminal screw, if it's not feruded.
Also I never used bare copper with PE insulation, the instalations I've done was always Pre insulated PE cable - solid or stranded. Although I know is somewhat common in the US/JPN/UK instalations.
When I need to, I use the normal 3M insulation tape for identification above the insulation