The NEC added the Class 4 rating in November 2022 in Article 726. This rating is applied to power systems that can provide up to 450V DC, and have fault-management built-in for safety. You can think of Class 4 rated power systems as a combination of Class 2 power systems (such as PoE), and traditional AC power. Class 2 and Class 4 both provide suitable protection from fire and shock hazards, but PoE can only provide up to 100 W of power. Read our blog to learn more about Class 4 Power Systems.
Cables in low voltage, high power, applications (such as traditional telecom rectifiers) require larger cable gauges to support the current needed.
Cables in Class 4 systems have a gauge that is about 10x smaller than the gauge of a cable with 48V DC running through it, carrying the same amount of power.
Copper Wire for Class 4 DC power transmission
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