Modifications reserved Pagina 27/90
OPM_SPE_XXX_60K_60K_7GB_V010.doc Operatine Manual SitePro 60 kVA
4.7.2 Input/output overcurrent protection and wire sizing
The cabling of the UPS system has to be sized according to the UPS power rating.
Exceptions are only allowed to suit local prescriptions.
Sizing of circuit breakers, fuses and cables for input mains, output load and battery must meet the
requirements of local and national electrical codes.
Before connecting the UPS, verify that the mains voltage and frequency, the output load voltage and
frequency and battery data (cells number, floating voltage, autonomy) are according to the required
data.
Protection of the UPS mains input, must be exclusively with 3 pole breakers.
The UPS needs the connection of the Neutral to the input, to guarantee the function in TN mode.
Caution when using four-pole circuit breakers as protection to the load of the UPS.
A potential problem exists for situations with non-linear loads: the neutral current could be greater
than the phase currents.
Avoid to run the input cables in parallel with the output cables to prevent them from noise induction.
The three-phase Mains power supply must be symmetrical with respect to earth, due to the existence of
voltage surge protection devices inside the UPS.
NOTE !
If you use ELCB breakers to protect the input connections, consider the high leakage
current towards the earth generated by the noise suppression capacitors.
If these ELCB breakers are strictly necessary, we suggest to use the largest type
suitable for non-linear current and for delayed operation.
To ensure the circuit selectivity in case of short- circuit in the load equipment, special care must be
taken in choosing the fuse or circuit breaker ratings installed in the output distribution circuits.
Due to the relatively low short-circuit capability of the UPS inverter, a short-circuit in the load will cause
an immediate transfer to mains.
The largest fuse in the output distribution should be at least 1.6 time smaller than the fuses supplying
the bypass line.
If circuit selectivity is required while the load is fed from the inverter (bypass mains not available), the
largest fuse or circuit breaker should be rated at no more than 20% of the UPS output current rating.
Fuses AgL / circuit breakers for
3x380/220V, 3x400/230V, 3x415/240V
Cables section (mm
2
) A, B, C, D, E, K (Fig. 4.7.1-1/2)
Recommended by European Standards
kVA F1 F2 F3 = F1 F4
A B D C = E K
60
3 x 125 A 3 x 100 A 3 x 125 A 2 x 160 A 3 x 35 + 25 4 x 25 4 x 25 + 16 4 x 35 + 25 2 x 50
Cables section (mm
2
) A, B, C, D, E, K (Fig. 4.7.1-1/2)
Recommended in Switzerland (SEV/ASE)
kVA
A B D C = E K
The delivery and installation of
fuses and input/output
connections of the UPS are at the
customer’s expense, unless
agreed otherwise.
60
3 x 50 + 25 4 x 35 4 x 35 + 25 4 x 50 + 25 2 x 70
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