Washington Administrative Code(WAC) and Revised Code of Washington (RCW) Electrical Practice Exam

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When conducting electrical work under a mobile home, what is a necessary installation element?

Grounding plates
Junction box near the rim joist
Temporary scaffolding
External power supply

The correct answer is: Junction box near the rim joist

When conducting electrical work under a mobile home, the installation of a junction box near the rim joist is essential for several reasons. This location allows for easy access to electrical connections and wiring that runs into the mobile home. Additionally, it serves as a point where wires from the home can be securely joined with the wiring that is delivered from the utility supply, facilitating maintenance and future upgrades. The placement of junction boxes is important for code compliance, as it provides protection, reduces the risk of electrical shorts, and ensures that all wiring is properly housed in cases where connections are made. Furthermore, having a junction box located in this area allows for the proper sealing and protection from environmental factors, which is particularly important considering the unique conditions that might be present under a mobile home. This installation practice not only adheres to safety standards but also aids in the overall reliability of the electrical system in the mobile home.