Master Electrician Practice Exam

What should be done to a raceway or sleeve known to be subjected to different temperatures and where condensation is a problem?

1. Empty the raceway

2. Fill it with an approved material

3. Insulate the outside only

4. Leave it unfilled

The correct answer is: Fill it with an approved material

Filling a raceway or sleeve that is subjected to varying temperatures and has potential condensation issues with an approved material is the best practice. This solution helps to mitigate the effects of condensation, which can lead to moisture accumulation and damage to the conductors. An approved fill material is designed to provide environmental stability, protect the integrity of the electrical components, and ensure compliance with safety regulations. By using an appropriate filling, not only is the risk of condensation reduced, but it also helps in maintaining the thermal stability of the conductors within the raceway. The fill material can act as a barrier, regulating temperature fluctuations and minimizing the potential for water and moisture accumulation, which is key in environments where temperature changes are expected. Other options, such as emptying the raceway or leaving it unfilled, do not address the moisture problem and could expose the conductors to condensation, leading to potential corrosion and failures. Insulating the outside only may help slow down temperature changes but does not tackle the condensation issue directly. This makes filling the raceway with an approved material a comprehensive solution to ensure the reliability and longevity of the electrical system in variable temperature conditions.