In connection with lowering or raising of persons by means of bucket etc. for a shaft exceeding "A" m in depth, there shall be significant cover overhead for protection from things falling down the shaft. A is given by

Solution (By Examveda Team)

For shafts exceeding 130 meters in depth, regulations typically require significant overhead protection when lowering or raising persons using equipment like buckets.

This is to ensure the safety of workers by preventing injuries from falling debris or objects.

The depth of 130 meters is a standard threshold in many mining safety guidelines, beyond which additional precautions, such as overhead covers, become mandatory.

Why other options are incorrect:
- Option B: 190m: This depth exceeds the standard threshold of 130 meters and is not the correct answer.
- Option C: 270m: This depth is also beyond the standard threshold and is not relevant to the question.
- Option D: 500m: This depth is significantly higher than the standard threshold and is not applicable in this context.

Thus, the correct answer is Option A: 130m, as it aligns with standard mining safety regulations for overhead protection in deep shafts.