When it is impractical to install the service drop below the weatherhead, the point of attachment can be located no farther than ______" from the point of attachment.

The correct choice of 24" relates to standard electrical practices regarding the installation of overhead service drops. A service drop is the portion of the overhead conductors that connects the utility's distribution system to the customer's premises. The weatherhead is the point at which the service drop enters the building, and it typically includes a fitting that keeps water out while allowing the wires to come from above.

According to the National Electrical Code (NEC), if it's impractical to install the service drop below this point, the length of conductor run allowed beyond the weatherhead is restricted to maintain safety and compliance. In this context, limiting the distance to 24" ensures that the service entry is manageable and reduces the potential for stress or strain on the service line connections. This standard fosters safety by helping ensure that there's adequate tension on the cables, while also addressing weather and environmental factors that could affect the integrity of the electrical service.