What must be integrated into the flexible cord supplying electrical equipment for fountains?

The correct answer highlights the requirement of integrating an insulated copper grounding conductor into the flexible cord supplying electrical equipment for fountains due to safety considerations. Fountains, being water-related installations, present unique risks associated with water and electricity. A grounding conductor is essential for protecting users and maintenance personnel from potential electric shock that could occur in the event of a fault.

The insulated copper grounding conductor provides a reliable path back to the ground for any fault current, ensuring that the electrical system can safely trip protective devices (like circuit breakers) and minimize the risk of shock. This grounding requirement is part of the overall safety measures outlined in the NEC, specifically tailored for areas where electrical equipment interacts with water.

The other options do not align with the specific safety protocols established in the NEC for fountains. A grounding plate, while useful in some applications, does not serve the same purpose as an insulated grounding conductor in this context. A weather-resistant cover may be beneficial in protecting the equipment from the elements but does not address grounding issues directly. Similarly, shock-absorbing housing is more relevant to mechanical protection than to electrical safety and grounding requirements. Thus, the integration of an insulated copper grounding conductor is critical for ensuring the safe operation of electrical equipment in fountains.