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The minimum weight of a manhole cover designed to prevent access by unqualified persons is 100 lbs. This weight specification is based on safety measures to ensure that unauthorized individuals, including children and others who may not have the proper training, cannot easily lift or gain access to potentially dangerous areas like underground utilities or drainage systems.

A manhole cover of this weight strikes a balance between being substantial enough that it deters casual tampering while still being manageable for trained personnel to open when necessary. The selected weight aids in preventing accidental removal or access, thereby upholding safety in urban environments.

The other weight options are not sufficient to meet the criterion of preventing access effectively, as they may allow for easier lifting by individuals lacking the necessary training or tools. The choice of 100 lbs aligns with standards and regulations aimed at public safety and secure utility operations.