Electrical Power Distribution Industry Definitions
In the context of electrical power distribution, the United States 2005 National Electrical Code (NEC) defines low (distribution system) voltage as 0 - 49 volts. Low Distribution (system voltage) is covered by 250.20(A) of this code.
The NFPA standard 79 article 6.4.1.1 defines distribution PELV as nominal voltage of 30 Vrms or 60 Vdc ripple free for dry locations and 6 Vrms or 15 Vdc in all other cases.
Read more about this topic: Low Voltage
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