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In the 2023 NEC, one rapid shutdown option limits conductors inside the array boundary to how many volts within 30 seconds?

80 volts within 30 seconds of rapid shutdown.

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  1. 80 volts ✔
  2. 30 volts
  3. 600 volts

Why: The 2023 NEC keeps an 80 volt, 30 second limit for conductors inside the array boundary. The 30 volt limit applies outside the boundary. A listed hazard control system is the other option.

Huh, didn't know that: The 2023 NEC removed 690.12(B)(2)(3) because it was absorbed into the UL 3741 standard.

The dad joke
Why was the solar installer calm after rapid shutdown? Everything was down to 80 volts.
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References

Answer: 80 volts. The 2023 NEC keeps an 80 volt, 30 second limit for conductors inside the array boundary. The 30 volt limit applies outside the boundary. A listed hazard control system is the other option.

  1. IAEI Magazine: NEC Rapid Shutdown Requirements and UL 3741 iaeimagazine.org/electrical-fundamentals/nec-rapid-shutdown-requirements-and-ul-3741
    controlled to not more than 80 volts within 30 seconds of rapid shutdown initiation
    Checked 2026-10-10.

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