Which of the following is true regarding service-drop wire polarity?

The statement that the grounded wire is connected to the neutral of the mains is accurate. In electrical systems, especially in residential wiring, the neutral wire serves as a return path for the current and is typically connected to the ground at the main electrical panel. This creates a balanced system where the neutral provides a safe pathway for electricity to return, while also offering a means to dissipate any fault current safely into the earth.

A grounded wire, typically referring to a grounding conductor, is often connected to the neutral at the service entrance. This connection helps to establish a reference point for the system, ensuring safety and proper operation of protective devices such as circuit breakers and fuses. It also minimizes the risk of electrical shock and prevents voltage surges from damaging equipment.

Understanding the role of various wires in an electrical system is crucial for maintaining safety and compliance with regulations. The other options do not accurately reflect the standards and safety practices pertaining to electrical wiring and service-drop wire polarity.