Probable Effect Concentration Quotients (PECQS) Practice Test

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What condition applies when conductors are installed in raceways regarding size?

They should be all of the same size
Only largest must be bare
Different sizes are permitted
Conductors of certain size must be stranded

The correct answer is: Conductors of certain size must be stranded

When conductors are installed in raceways, one key condition is that conductors of certain sizes may be required to be stranded, especially when considering factors such as flexibility and ease of installation. Stranded conductors consist of multiple smaller wires bundled together, making them more flexible than solid conductors of the same overall gauge. This flexibility is particularly useful in applications where wires need to bend or twist to fit through raceways and other enclosures. The installation requirements can vary based on the type of raceway and the specific application's electrical needs. Stranded conductors can also be beneficial for reducing the risk of damage during installation and for improving performance in dynamic environments, such as in motors or displacement applications. Other options such as having all conductors of the same size, only the largest being bare, or allowing different sizes without a specific requirement do not address the technical aspects of conductor installation and the practical benefits associated with stranded conductors. Hence, the emphasis on stranded conductors in specific size conditions is crucial for ensuring reliability and effectiveness in the electrical system.