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For overhead feeder conductors not exceeding 600V that are installed above commercial areas subject to truck traffic, the minimum clearance required is indeed 18 feet. This regulation is established to ensure safe operation and provide adequate space for vehicles, particularly larger trucks that may be using the area.

The rationale behind this clearance requirement is to prevent electrical conductors from coming into contact with vehicles, thereby reducing the risk of accidental electrocution or damage to the electrical infrastructure. The 18-foot clearance is specifically tailored for environments where heavy and tall cargo vehicles circulate, acknowledging the height variance of commercial trucks and the potential load they carry.

In commercial settings, such a clearance is critical as it not only ensures safety for operators and pedestrians but also maintains the integrity of the electrical installation, preventing any disruptions that could arise from vehicles striking the conductors. Thus, maintaining an 18-foot clearance is not only essential for compliance with electrical codes but also represents a best practice in safeguarding both life and property in areas with significant vehicular activity.