Which of the following is a characteristic of double-insulated motors in hydromassage bathtubs?

Double-insulated motors are designed with enhanced insulation to prevent electric shock, which allows them to operate safely without the need for a grounding conductor or bonding. This characteristic is particularly relevant in applications like hydromassage bathtubs, where water is present and electrical safety is paramount. The absence of a requirement for bonding is a crucial aspect of double insulation, distinguishing these motors from other types that may require bonding to ensure safety.

In contrast, the other options reflect requirements or characteristics that do not pertain to double-insulated motors. For example, while bonding might be required for other types of motors or electrical installations to prevent electrical shock, double-insulated motors do not fall under this requirement due to their construction and inherent safety features. Additionally, low power consumption or the installation location of the motors does not directly define the essence of double insulation. Thus, the correct answer emphasizes the exemption from bonding as a primary and distinctive feature of double-insulated motors.