What factor determines the type of plating used on a copper conductor?

What factor determines the type of plating used on a copper conductor?

• A. Ambient humidity
• B. Maximum operating voltage
• C. Length of run
• D. Highest expected temperature the conductor will get

Answer: (D)

Plating is chosen to survive the service temperature. The highest temperature the conductor will reach determines whether the plating can remain protective, resist oxidation, and maintain solderability and adhesion without degrading. If temperatures are high, you’d pick a plating with good high-temperature stability and corrosion resistance (such as nickel or silver). At lower temperatures, tin plating can be sufficient and cost-effective. Ambient humidity, maximum operating voltage, and length of run influence other design considerations, but the plating type is ultimately driven by how hot the conductor will get in operation.

Plating is chosen to survive the service temperature. The highest temperature the conductor will reach determines whether the plating can remain protective, resist oxidation, and maintain solderability and adhesion without degrading. If temperatures are high, you’d pick a plating with good high-temperature stability and corrosion resistance (such as nickel or silver). At lower temperatures, tin plating can be sufficient and cost-effective. Ambient humidity, maximum operating voltage, and length of run influence other design considerations, but the plating type is ultimately driven by how hot the conductor will get in operation.