If the main service fuses are labeled backward and unreadable, what should you do?

The most appropriate course of action when the main service fuses are labeled backward and unreadable is to report that the main service fuse rating was not determinable. This answer is correct because it emphasizes the importance of accurate documentation and safety in home inspections.

When fuses are unreadable or improperly labeled, attempting to turn off the power and remove a fuse poses a risk of electric shock or damage to the electrical system. Measuring the diameter of the fuse body is not a reliable method for determining its rating, as the diameter can vary and does not necessarily correlate directly with the specific amp rating of the fuse. Using an inspection mirror to read a label may still not provide a clear understanding of the fuse's rating due to potential visibility issues or the label being completely unreadable.

By reporting the indeterminable rating, the inspector is indicating a potential safety concern for future homeowners or electricians who may work on the system. This approach encourages further investigation or evaluation by a qualified professional, ensuring that the electrical system is safe and compliant with standards.