12
MASTERYS BC 100-120 kVA - Ref.: IOMMASBCXX07-EN 05
2. UNPACKING AND INSTALLATION OF THE UNIT
2.5. ELECTRICAL REQUIREMENTS
The installation and system must comply with national plant regulations. The electrical distribution panel must have a protection
and sectioning system installed for the input mains and the auxiliary mains. If a di erential switch is installed on the mains power
switch (optional), it must be inserted upstream from the distribution panel.
The table below shows the size of the input protection devices recommended for correct installation.
Size of the input protection devices
Magneto-thermal
input
(1)
Magneto-thermal
Aux Mains
(1)
Di erential
input
(4)
Input/Output
cable core size
Battery cable
core size
Magneto-thermal
battery
(3)(6)
(A) (A) (A) (mm
2
) (mm
2
) (A)
single parallel
(2)
single parallel
(2)
selective
type
Min Max Min Max
(5)
250 250 250 250 0,5 70 150 70 120 250
(1). Recommended magneto thermal switch: four poles with intervention threshold ≥ 10 In (curve C). It is necessary to use a D curve selective
breaker if an optional external transformer is used.
(2). In installations with two UPSs operating in a redundant or power parallel confi guration.
(3). Quadrupole protection on external battery cabinet.
(4). Caution! Use type B four-pole selective (S) circuit breakers. Load leakage currents are added to those generated by the UPS and during
transitory phases (power failure and power return) short current peaks may occur. If loads with high leakage current are present, adjust the
di erential protection. It is advisable in all cases to carry out a preliminary check on the earth current leakage with the UPS installed and
operational with the defi nitive load, so as to prevent the sudden activation of the above switches.
(5). Determined by the size of the terminals.
(6). Recommended magneto thermal switch: four poles with intervention threshold = 3 In suited for DC applications.
The UPS is designed for transitory overvoltages in category II installations. If the UPS is part of the building’s
electric circuit or if it is likely to be subject to transitory overvoltages in category III installations, further external
protection must be provided, either on the UPS or in the AC power supply network connected to the UPS.
Additionally, the ‘surge arrestor’ option, specially designed to protect against residual overvoltages in category
III installations, can be installed in the external manual bypass cabinet. If used, the distance between the UPS and
the centralised 4 kV SPD protection device type 1 must be Up ≤ 4 kV is ≥ 15 m.
GENSET must support load variations from 0 to 100%.
In the event of three-phase distorting loads connected in output, the current on the neutral conductor may have
a value that is 1.5 - 2 times the phase value (also for the input bypass). In this case, size the neutral cables and
the input/output protection adequately.
WARNING!
This is a product for commercial and industrial application in an industrial environment - installation restrictions
or additional measures may be needed to prevent interference.
IMPORTANT!
Protective earthing conductor (PE) must have sufficient current-carrying capacity.
The PE cable core size must be chosen according to the PROTECTIVE CURRENT RATING of the earth circuit
which depends on the provision and location of protective overcurrent devices. We suggest 70 mm
2
using the
protective devices in the above table.
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