Minimum voltage the code defines

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Typically in jurisdictions, we see voltage limitations based on licensing agreements.

In the NEC if you are concerned about voltages, check these references for informational purposes:

90.2, Art 100- Voltage (of a circuit)-nominal-to ground, 110.4, 110.30, 220.5 and other articles such as 411, 490, 720, 770, Chapter 8, etc...Generally the last PART of many Articles. These are not restrictive, but just relative to voltage ratings.
 
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