If it is desirable to use wire sizes smaller than gauge 20, particular attention should be given to the

• A. Mechanical strength and installation handling
• B. Insulation color
• C. Voltage rating
• D. Conductor type

Answer: (A)

When you use wire sizes smaller than gauge 20, the main concern becomes how easily the conductor can be damaged during installation and operation. Thinner wires are more delicate and have less mechanical strength, so they’re more prone to damage from bending, kinking, rubbing, and vibration. Because of this, extra care is needed in routing and securing them: provide strain relief at terminations, protect them with conduit or sleeving, maintain generous bend radii, and secure them at appropriate intervals to prevent movement and abrasion. Keeping them away from sharp edges, hot surfaces, and moving parts is also important to avoid insulation damage that could lead to faults.

Insulation color or conductor type doesn’t address these physical vulnerabilities, and while voltage rating is important for electrical safety, the immediate priority when using very small wires is ensuring they’re protected from mechanical damage during installation and use.