What is required for the grounding of central vacuum outlet's accessible non-current carrying metal parts?

For the grounding of central vacuum outlet's accessible non-current carrying metal parts, a connection to an equipment grounding conductor is essential. This requirement ensures safety by providing a path for fault current, which helps to prevent electric shock in the event of a fault within the system. The equipment grounding conductor connects the metal parts of the vacuum outlet to the grounding system of the electrical installation, thereby maintaining the integrity of the electrical system and enhancing safety.

Additionally, grounding the non-current carrying metal parts helps divert any stray currents away from the user. The National Electrical Code (NEC) and local electrical codes, such as those enforced in New York City, outline these requirements for safety and reliability in electrical installations. Proper grounding practices are critical in electrical systems, especially for appliances that involve user interaction, like central vacuum systems.

In this context, connecting to a phone line or the main power supply does not address the safety concerns associated with grounding non-current carrying metal parts. Similarly, stating that no grounding is necessary ignores the established safety protocols that protect both users and the integrity of the electrical installation.