Where is Type CMUC communications wire allowed to be installed?

Type CMUC communications wire is specifically designed for use in locations where there may be some exposure to moisture, such as under carpets. This type of wire is suitable for indoor use and is intended to provide safe communication connections without the risk of damage that might occur with other wire types. Its installation under carpet is permissible because the insulation and materials used are rated for such applications, ensuring both compliance with safety regulations and effectiveness for the intended use.

The other options may not align with the specific ratings and requirements for Type CMUC wire. For example, outside walls may require a different insulation type to withstand environmental conditions. Ceilings can present other risks such as increased exposure to heat or electrical disturbances. Basements, while they might seem suitable, typically expose wiring to higher moisture levels or flooding risks, which are not ideal for communications wires that are not rated for those conditions. Thus, the under-carpet installation of Type CMUC communications wire is supported by its design for moisture resistance in indoor environments.