What prevents the re-strike of the arc after a fuse has been extinguished?

Study for the 2nd Year Lineman Apprentice Exam. Utilize flashcards and multiple-choice questions with explanations and hints. Prepare effectively for your exam!

The phenomenon that prevents the re-strike of the arc after a fuse has been extinguished is the presence of de-ionized gases. When an electric arc occurs, it ionizes the surrounding air, allowing current to continue flowing. However, once the fuse has blown and the arc extinguishes, the gases in the immediate area start to cool and return to their neutral state, which is non-conductive.

De-ionization significantly reduces the ability of any residual gases to conduct electricity, making it difficult for the arc to re-establish. In this state, the absence of free electrons means that the environment is no longer favorable for an arc to strike again. This is why de-ionized gases play a crucial role in ensuring that once a fuse has blown, the circuit remains open and further arcing does not occur.

The other options, while they may have properties related to electrical behavior, do not directly and effectively prevent the re-strike of an arc in the way that de-ionized gases do. For instance, carbon dioxide extinguishes flames but does not impact ionization in the same way, and a vacuum, while preventing ionization, is not a common feature in typical fuse designs. Oil can help in certain types of circuit breakers

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