Low-Voltage Cabling Practice Test

The downside to copper-clad steel and copper alloys is that they have ______.

inferior current-carrying ability higher cost better flexibility lower temperature tolerance

Correct Answer:

inferior current-carrying ability

Explanation:

When you use copper-clad steel or copper alloys, you gain strength, lower weight, and often reduced cost, but you trade off current-carrying ability. The steel core (or alloy portion) conducts far less efficiently than copper, so a conductor of the same overall size has less of the high-conductivity material carrying the current. This raises resistance and heat for a given current, reducing the ampacity compared with solid copper of the same overall dimensions. In short, these materials are used when mechanical properties and cost matter more than maximum current-carrying capacity. The other options aren’t the typical downside: they aren’t consistently more expensive, and they aren’t known for better flexibility or significantly different temperature tolerance.

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