Gas Fitter Practice Test

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Which wiring type is most cost-effective for a concealed new appliance installation in a basement?

The correct answer is: NMD

The most cost-effective wiring type for a concealed new appliance installation in a basement is NMD. This type of wiring, also known as non-metallic sheath cable, is favored for its affordability and versatility, particularly in residential projects. NMD is designed for dry locations, making it suitable for basements, and it allows for easy installation in concealed spaces due to its flexibility and light weight. This type of wiring can come in multiple conductors and is often easier to handle compared to heavier alternatives. Moreover, NMD wiring provides good protection against moisture, which is essential in basement locations. Its straightforward installation process can lead to lower labor costs and reduced overall expenses for the project. In contrast, other types such as BX, which is a type of armored cable, tend to be more expensive due to their robust metal construction. Although BX provides excellent physical protection, the added cost may not be justified for a concealed installation where direct exposure to physical hazards is minimal. NMW, being meant for wet or damp conditions, could also be over-specification for a dry basement. Lastly, LVT (Low Voltage Thermoplastic) is generally used for low-voltage applications, making it unsuitable for most appliance installations that require standard voltage wiring. Therefore, NMD