Moderate
Which of the following bus-bar schemes has the lowest cost?
Correct answer: B. Single bus-bar scheme
- A. Ring bus-bar scheme
- B. Single bus-bar scheme
- C. Breaker and a half scheme
- D. Main and transfer scheme
Explanation
The single bus-bar scheme has the simplest arrangement with the fewest circuit breakers and isolators, so it has the lowest installation cost. Its disadvantage is lower reliability because a bus fault can interrupt the entire supply.
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