Which arrangement matches the description 'one or more insulated conductors covered with a metallic braided shield'?

• A. A conductor covered with a metallic braided shield
• B. An insulated conductor with no shield
• C. A bare conductor
• D. A conductor with plastic sheath

Answer: (A)

Shielding is the idea here: when one or more insulated conductors are wrapped inside a metallic braided shield, you’re dealing with shielded cable. The insulation keeps the individual conductors from touching each other or grounding inadvertently, while the braided shield acts as a conductive barrier that blocks external electromagnetic interference and helps contain any noise produced by the conductors themselves. In aviation wiring, this shield is typically copper braid and is often bonded to ground at one or both ends to provide a path for interference to dissipate. Sometimes there’s an outer plastic jacket for protection, but the key feature is the metallic braid surrounding the insulated conductors. The other arrangements don’t fit this description because they either lack the metallic shield or lack insulated conductors inside a shield.