What is a requirement for the circuit of a hydro massage bathtub?

For a hydro massage bathtub, the requirements for the electrical circuit ensure safety and compliance with electrical codes. Firstly, having a disconnect within sight of the motor is essential. This allows the user or service personnel to easily access the disconnect switch in case of an emergency, ensuring that the power can be quickly turned off to prevent electrical shock or fire hazards.

Additionally, GFCI protection is a critical requirement due to the nature of the installation. GFCI, or Ground Fault Circuit Interrupter, helps protect against electrical shock by shutting off the electrical circuit if it detects an imbalance between the outgoing and incoming electrical current. This is particularly important in areas where water is present, as it significantly reduces the risk of electrocution.

Lastly, the requirement that the disconnect may be a cord and plug is relevant for installations that are more portable or when a simpler disconnection method is more practical. This option allows easy removal of the unit for maintenance or travel, further enhancing safety and usability.

Thus, since all these elements—having a disconnect within sight, ensuring GFCI protection, and allowing flexible disconnect methods—are mandatory for safe operation and compliance in hydro massage tubs, the correct answer encompasses all these requirements.