Translations:Wiring practices/3/en

• To prevent damage from the accidental contact with a person that may move the wire. An overly tight wire exposed to tension may immediately break free from its connection and cause a fault or fire.
• To allow for expansion and contraction of wire and conduit resulting from heating and cooling.
• To provide extra wire that enables safe working conditions in the future.

• All connections made with wire should be done with some kind of mechanical connection, like a wirenut, busbar, terminal or PV module connector. Connections performed solely with electrical tape - as is common practice in many parts of the world - are far more likely to fail and cause issues.
• All wires that are entering a connection (busbar, should leave some conductor (copper) exposed to ensure that insulation is not entering the connection. Insulation in a connection can create resistance, heat and ultimately a fire.
• All connections should be tested with a gentle tug after being completed to ensure that the connection is solid and will not come undone easily.