What should be done before introducing an individual open conductor into a tube?

Forming a drip loop on an individual open conductor before introducing it into a tube is an important practice to prevent water ingress and ensure proper drainage. A drip loop is a section of conductor that hangs lower than the point of entry into the tube, allowing any moisture that collects on the conductor to drip off instead of running into the enclosure or conduit. This is crucial in maintaining the integrity of electrical installations and preventing water accumulation which could lead to corrosion, short circuits, or equipment failure. By incorporating this preventative measure, the safety and reliability of the electrical system are enhanced.

The other practices, while they may have certain uses in different contexts, do not address the specific concern of moisture prevention when introducing conductors into a tube.