Generally, the wire connectors are all connected in such a way that it can ensure that the wire connectors do not ignite or short-circuit, and the phenomenon of poor contact is the construction specification, which is what every electrician should do.
The second approach is also specified in the construction specification. The branch line is this connection, the main line cannot be cut off, and the attached wire winds 6-8 rounds around the main line.
Wires should be wrapped in with fireproof tape. Its role is to prevent electricity from burning and destroying things. This is very important in ceilings. In particular, many ceiling materials now use wood to make keels, and they need to do so.
The end of each wire is to be treated as such, so as to effectively avoid the risk of electric shock, but also from the details of the workers to see if the work is professional. Or use a pressure cap.
Hydropower renovation