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Rising Mains and Bus Ducts

In large buildings, internal power distribution is generally carried out using ________________.

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Answer & Explanation

Correct AnswerC. Rising mains, bus ducts, or distribution boards

Quick Explanation

Large buildings use structured distribution systems such as rising mains, bus ducts and distribution boards so that power can be distributed safely, selectively and with suitable protection at different levels.

Rising Mains and Bus Ducts explanatory diagram

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Correct Answer

C — Rising mains, bus ducts, or distribution boards

Explanation

Key Concept

Rising Mains and Bus Ducts

Exam Point

Large building = bus duct/rising main + distribution boards.

Quick Trick

Large building = bus duct/rising main + distribution boards.

Exam Tip

Large building = bus duct/rising main + distribution boards.

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01 ADDITIONAL ASSISTANT ENGINEER.pdf2026Q. 35

Rising Mains and Bus Ducts

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