What kind of protection is required for all 15- and 20-ampere receptacles supplied by circuits from a sensitive electronic system?

For receptacles that supply circuits from a sensitive electronic system, Ground Fault Circuit Interrupter (GFCI) protection is necessary due to the nature of these systems and the potential risks involved. GFCI devices are designed to protect against electrical shock by monitoring the current flow and quickly cutting off power if an imbalance is detected, which can occur if there is a fault such as a short circuit or faulty equipment.

Sensitive electronic systems, like computers and medical devices, can be particularly vulnerable to electrical faults and require additional safety measures to prevent harm to users and equipment. GFCI protection ensures that any ground faults are detected within milliseconds, thus providing a safer environment for both the equipment and the users.

Other forms of protection, such as fuses or surge protection, may play important roles in electrical safety and equipment longevity, but they do not specifically address the immediate risk of electric shock as effectively as GFCIs. Similarly, MCCB (Molded Case Circuit Breaker) protection offers circuit overload and short-circuit protection, but does not provide the ground fault protection necessary for sensitive electronic systems.