What type of wire insulation does 'T' refer to?

The designation 'T' in wire insulation typically stands for thermoplastic. Thermoplastic materials are known for their ability to be molded into shape when heated and retain that shape upon cooling, making them widely used in insulation applications. This type of insulation allows for flexibility and durability, which can be critical for electrical installations.

Thermoplastic offers advantages such as resistance to moisture and chemicals, making it suitable for various environments where electrical wires might be exposed to demanding conditions. Additionally, thermoplastics can be processed easily and are often more cost-effective compared to other insulation types.

The other options represent different types of wire insulation that do not match the 'T' designation. For example, mineral insulated refers to a construction that uses a metal sheath and has insulating material made from magnesium oxide, while varnished cambric, made from cotton or other fabrics, is treated with varnish to provide insulation. Cross-linked synthetic polymers are thermosetting plastics and do not fall under the category identified by 'T'. Thus, the designation accurately identifies thermoplastic as the correct type of wire insulation.