What does N indicate in wire classification?

• A. Nylon coated for both oil and gas resistance
• B. Nylon insulation for cosmetic color
• C. Nylon core with no coating
• D. Nylon braided shielding

Answer: (A)

N indicates nylon coating designed to resist oil and gas exposure. Nylon coatings are chosen when a wire may encounter oils or hydrocarbons, providing that chemical resistance along with durability. The other descriptions don’t reflect a performance property: nylon merely for cosmetic color doesn’t imply resistance, nylon core with no coating wouldn’t offer oil/gas resistance, and shielding refers to protection around the conductor, not the coating’s chemical resistance.