Go to main contents pagePower supplies to data processing hardware, known as switch-mode power supplies, are non-linear charges generating significant leakage and harmonic current.
Leakage current circulates, in particular, in the Neutral conductor. Leakage current may be more significant than the current circulating in the Phase conductor(s). Leakage current is defined in compliance with switch-mode electric power and the standards in force.
Charge current wave is deformed by the harmonic current. Harmonic current is generally odd (3, 5, 7, ...) and superimposes the fundamental frequency. The peak factor may range between 0.5 and 5 times the effective value according to power supply type and generation.
The use of a switch-mode power supply implies that the Neutral wire is an active conductor.
The characteristics of this type of non-linear charge may have an adverse effect on the equipment if precautions are not taken with regard to:
magneto-thermic circuit breakers shall be installed on the Phase and Neutral wires, in compliance with the safety standards in force. |