[6510]

In the Netherlands anyone may do the wiring of their house themselves but if it is a substantial modification (or an entire installation) a certified electrician has to sign off on it. They are not likely to stick their neck out for any funny business.

That said, I've seen plenty of work from experienced certified electricians that was complete garbage. Not just a few things, more than half their work.

Things like, they cut half way though the wire removing insulation. When you pull the socket out of the wall the wire breaks. So you have to strip it again but they also cut it to short so you have to pull a new wire into the tube. Then you discover the tube is a bunch of segments behind the wall or it has multiple sharp 90 degree corners and the wire wont move or the new wire wont go in. Then you have to open up the walls, new plaster, new paint, do you want one wall with wall paper that doesn't match or will you go for new wall paper for the entire house/floor? All because they did multiple terrible things.

[Marsymars]

You've got romex in conduit?

I'm not an electrician, just a DIY enthusiast (and the parent commenter) - but in North American construction, romex in conduit is basically unheard of in residential builds - it's stapled to the framing during construction, so once you cut wire short, you've immediately put yourself in a pickle.

[6510]

We use rigid 16 mm pvc conduit (bend with heat) with 2.5mm2 wires in brown(+) blue(-) yellow/green stripe(gnd) and 1.5mm2 black for switched wires.

Ideally you bend the pipe as little as possible and make the corners as smooth or as blunt as possible. If done properly you can later add extra wires. If not done properly you only get the illusion you can.

With romex you have to anticipate future changes.

[rickydroll]

Here in the states, putting Romex in conduit is considered a code violation. You're supposed to use THHN wire in a conduit.

I wish professional electricians use pigtails and wago lever nuts instead of wire nuts. Working an old house, I've had to cut way too many wires almost too short just to add another neutral or ground.

[dcrazy]

I don’t think they implied Romex? Conduit is mandatory in multi-family construction here in San Francisco, but they just use armored cable, not romex in conduit.