What type of conductors are used in the two wire number 12 armored cable typically used in an ordinary lighting circuit?

The use of solid and rubber insulated conductors in a two-wire number 12 armored cable for ordinary lighting circuits is appropriate because solid conductors provide a reliable and efficient means of carrying electrical current. This type of conductor is less prone to breakage and is often considered better for permanent installations, such as in residential lighting circuits, where the wiring is not subject to frequent movement or flexing.

Rubber insulation is favored for its flexibility and durability, making it suitable for varying environmental conditions. It offers good weather resistance and helps prevent abrasion, which is particularly beneficial in armored cable applications where additional mechanical protection is necessary. The combination of solid conductors and rubber insulation ensures that the cable performs effectively while maintaining safety standards in typical residential wiring systems.