Which of the following statements about plastic splice cases is true?

The statement about plastic splice cases being the only type approved for telephone cable terminations is correct because plastic splice cases are specifically designed to protect and organize the terminations of telephone cables. They provide critical insulation and moisture resistance, which are necessary for maintaining the integrity of the communication system and ensuring the reliability of the network.

In various installations, especially for telephone systems, certain standards dictate that plastic splice cases be used because they offer essential features such as durability and ease of access for maintenance. These cases make it easier to perform splicing and repairs, which is crucial in telecommunications where downtime can lead to significant disruptions.

While there may be other types of splice cases available, plastic splice cases are frequently preferred for this particular application due to their specific design advantages that cater to the needs of telephone cable terminations. This contributes to their establishment as a common and often mandated choice for such tasks in many regulatory contexts.