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Hazardous Voltage Levels

Hazardous Voltage Levels - RF CafeHigh voltage. Low voltage. We hear the term used often, but it would be good to have a definitive listing of what voltage levels qualify for which levels. The table below lists some typical names and the corresponding voltage levels. The video clip at the left appeared as a Cool Pic on RF Cafe a year or so ago, and the one on the right was recently found. Both are awesome.

For human electrocution levels, please click here.

Name Range Description
Safety Extra-Low1 ≤42.2 Vac pk, ≤60 Vdc Considered "safe" for touching (although never recommended). Protected to "guarantee" voltage will never rise above these levels, even under a fault condition. Double insulated.
Extra-Low1 ≤42.2 Vac pk, ≤60 Vdc Non-touchable, but considered safe due to insulation from hazardous voltages.
Low2 ≤1 kVac Considered hazardous. These level are found in common residential and commercial equipment installations.
Medium3 >1 kVac to 100 kVac Very hazardous. Residential and small commercial transformers, both on poles and on the ground.
High3 ≥100 kVac to ≤230 kVac Very hazardous. Found in transmission grid systems including substations.
Extra-High4 >230 kVac to ≤800 kVac Extremely hazardous, even at a distance. Transmission systems between substations and power generation.
Ultra-High4 >800 kVac to 2 MVac Extremely hazardous, even at a great distance. Transmission systems between substations and power generation.



1: IEC 60950-1

2: NEC-NFPA 70 low voltage = 600 V, ANSI/IEEE low voltage = 1 kVac, EU's Low Voltage Directive = 50 V to 1 kVac & 75 to 1.5 kVdc

3: ANSI C84.1 & IEEE 100

4: IEEE 1312 & IEEE 100

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