Only which type of terminal boxes should be used for splicing telephone cables?

Metallic terminal boxes are the correct choice for splicing telephone cables due to their durability and effectiveness in providing protection and shielding for the wires contained within. Metal is inherently strong and can withstand various environmental factors better than other materials, reducing the likelihood of damage or exposure to external elements. Additionally, metallic terminal boxes often provide superior grounding capabilities, which is essential for maintaining signal integrity and preventing interference, especially important in communication systems.

The choice of metal also comes into play with regard to safety; a metallic box is less likely to warp or degrade over time, ensuring that connections are maintained securely. Furthermore, metallic boxes assist in improving the overall durability of the installation, which can be vital in both outdoor and indoor settings where telephone lines may be exposed to stresses or hazards.

Using alternatives like plastic, wood, or cement may not provide the same level of protection or reliability for telephone cable splicing. Plastic may not withstand heat or environmental stressors as well as metal, wood is susceptible to pests and moisture, and cement can be cumbersome and rigid, making them less suitable for this application. Thus, metallic terminal boxes are the industry standard for ensuring effective and long-lasting splices in telephone wiring.