Proof butt connectors are up to code
I believe your laws are similar to the US. As long as the product is listed for the purpose you want to use them they would be legal. I have both Thomas&amp;Betts and 3M brands and both labels show them to be UL listed 105 deg C , 600v building wire, or 1000v sign lighting luminary. This is all the proof I need. I don't use the "imported" super cheap products because they don't come with listing information if I can't prove there listed I can't use them. But since they are a splice they require a box or control panel to enclose them that is accessible.