Which material is normally used for mounting telephone outlets according to typical specifications?

The correct material commonly used for mounting telephone outlets is metal. Metal provides durability and strength that ensure secure attachment of outlets to walls or other surfaces. It also offers several practical advantages, such as better resistance to environmental factors, including moisture and heat, which can be important in maintaining the integrity of wiring and connections over time.

In addition to these elements, metal is typically preferred in professional installations for its ability to ground electrical connections effectively, minimizing the risk of interference or safety hazards. This grounding capability enhances the performance of telecommunications systems by providing a more stable and reliable setup, which is crucial for maintaining consistent service quality.

Other materials like plastic do not have the same endurance and grounding capabilities, while wood lacks the required resilience and may not meet fire safety standards. Concrete, although sturdy, is not typically used for mounting outlets due to its rigid nature and difficulty in making adjustments or installations. Therefore, metal is the standard material that fulfills both functional and safety criteria in mounting telephone outlets according to specifications.