What is the maximum distance the disconnecting means for a shore power connection should be from the receptacle it controls?

The maximum distance the disconnecting means for a shore power connection should be from the receptacle it controls is specified by the National Electrical Code (NEC) to ensure safe and practical operation. This distance, established at 30 inches, is intended to facilitate easy access for quick disconnection in case of an emergency while still ensuring that the installation remains safe and practical within the context of maritime or shore power settings.

A disconnecting means located within this distance can be easily reached from the receptacle it controls, which is crucial considering the potential hazards associated with high-voltage connections in marine environments. The specified distance of 30 inches aligns with safety practices by allowing for effective control and interception of electrical supply.

When considering the other options, the distances of 20 inches, 24 inches, and 36 inches either do not comply with the standards set by the NEC or do not provide the balance of accessibility and safety as stipulated in the code. The choice of 30 inches as the maximum distance is thus significant in promoting both accessibility and compliance with safety regulations in electrical installations.