What design feature must the components of an electric meter system have regarding access to the internal mechanism?

The internal mechanism of an electric meter system is designed to be sealed in order to prevent unauthorized access. This design feature is crucial for ensuring accuracy in metering, as it helps protect the internal components from tampering that could result in fraudulent activity or inaccurate readings. By requiring that access to the internal mechanism only occurs through the destruction of a seal, it serves as both a physical barrier and a deterrent against tampering. This safeguard maintains the integrity of the metering system, ensuring that the utility provider can trust the data being reported.

Options suggesting easy access or inspection without damage do not adequately protect against potential tampering. Similarly, while tamper-proof designs are important, the specification of a seal that must be destroyed for access confirms the emphasis on security within the mechanism.