Thank you for visiting Table 300 5 in the NEC permits a 120 volt 15 amp residential underground circuit to be buried as shallow as 13 inches below grade. This page is designed to guide you through key points and clear explanations related to the topic at hand. We aim to make your learning experience smooth, insightful, and informative. Dive in and discover the answers you're looking for!
Answer :
Final answer:
The NEC permits a 13-inch burial depth for a 120-volt, 15-amp residential underground circuit when using UF Cable, RMC, or PVC as the wiring method, as long as the circuit is protected with a GFCI. This depth provides protection against environmental stresses and physical damage, with GFCI ensuring safety against electrical shock.
Explanation:
According to Table 300.5 in the National Electrical Code (NEC), a 120-volt, 15-amp, residential underground circuit can be buried 13 inches below grade when the wiring method is a specific type and the circuit is protected with a Ground Fault Circuit Interrupter (GFCI). The correct answer to the question is d) any of these, meaning that the wiring method could be UF Cable, RMC, or PVC given that the circuit is GFCI-protected.
GFCI protection is designed to safeguard against electrical shock by quickly cutting off power when a difference in currents between the live/hot and neutral wires is detected. This provides an important layer of safety for circuits installed underground, where moisture and other environmental factors present additional risk factors.
The reason for the 13-inch burial depth requirement is to protect the underground cable from physical damage and other environmental stresses. It's also worth noting that local codes may have additional requirements that go beyond the NEC guidelines.
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