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In the NEC rapid shutdown rules, the array boundary is how far from the PV array in all directions?

The array boundary is 1 foot from the array.

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  1. 10 feet
  2. 3 feet
  3. 1 foot ✔

Why: Rapid shutdown rules divide PV circuits into inside and outside the array boundary. The boundary is set at one foot from the array in all directions.

Huh, didn't know that: Under the 2017 NEC, controlled conductors outside the array boundary had to drop to 30 volts within 30 seconds.

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What was the electrician's detective name? Sherlock Ohms.
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References

Answer: 1 foot. Rapid shutdown rules divide PV circuits into inside and outside the array boundary. The boundary is set at one foot from the array in all directions.

  1. IAEI Magazine: NEC Rapid Shutdown Requirements and UL 3741 iaeimagazine.org/electrical-fundamentals/nec-rapid-shutdown-requirements-and-ul-3741
    defined the term "array boundary" as one foot from the array in all directions
    Checked 2026-10-10.

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