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*Rectifier protection alone should only be considered in the event of separate inputs; if the bypass and
rectifier inputs are combined, the general input protection rating (bypass + rectifier) must reflect 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 rectifier 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.
KEOR T
11
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