*Rectier protection alone should only be considered in the event of separate inputs; if the bypass and
rectier inputs are combined, the general input protection rating (bypass + rectier) must reect the
recommended bypass or general protection rating.
*Recommended discrimination of UPS downstream distribution with inverter short-circuits current (battery
mode).
**Cables must be selected 1.2 times larger than the recommended size for parallel topologies.
***Must be selective with residual current circuit breakers downstream of the UPS connected to the UPS
output. If the bypass network is separate from the rectier circuit, or in the event of parallel UPS, use a single
residual current circuit breaker upstream of the UPS.
If the loads generates high rate of third harmonic current ( THDI > 33% ), the
current on the common mains supply voltage and auxiliary mains supply voltage
input and output neutral conductors may have a value that is 1.5-2 times the
phase value during operation. In this case, size the neutral cables and the input/
output protection adequately.
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