LMS Substation 2-2 Practice Test

Grillage foundations are widely used in substation construction because of their ability to evenly distribute heavy loads from electrical equipment and structures, such as transformers and switchgear, over a broader area. This is particularly important in substations, where heavy equipment needs a stable and secure foundation to function effectively and to ensure safety.

The grillage design often consists of a network of timber or steel beams laid out in a grid pattern, providing the necessary strength and stability while allowing for effective drainage and reducing the risk of soil settlement around the foundation. This makes grillage a practical and effective choice in many soil conditions, which is crucial for the longevity and reliability of a substation's operations.

Other options, while they may have specific uses, do not commonly serve as foundational structures for substations in the same way. For instance, drilled shafts tend to be used in other applications, particularly in areas with specific soil conditions requiring deep foundations. Open pit is more related to excavation rather than being a foundation type, and tunneling is not a common foundation method for substations, which require surface support systems.

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