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3.4.2 Quality, minimum section and
maximum length of cables
The cable connected to the sockets or powerlocks of
the ESS must be selected in accordance with local
legislation. The type of cable, its rated voltage and
current carrying capacity are determined by
installation conditions, stress and ambient
temperature. For flexible wiring, rubber-sheathed,
flexible core conductors of the type H07 RN-F
(Cenelec HD.22) or better must be used.
The following table indicates the maximum allowable
3-phase currents (in A), at an ambient temperature of
40°C, for cable types (multiple and single core PVC
insulated conductors and H07 RN-F multiple core
conductors) and wire sections as listed, in accordance
with VDE 0298 installation method C3. Local
regulations remain applicable if they are stricter than
those proposed below.
The lowest acceptable wire section and the
corresponding maximum cable or conductor length
for multiple core cable or H07 RN-F, at rated current
(20 A), for a voltage drop lower than 5% and at a
power factor of 0.80, are respectively 2.5 mm² and
144 m. In case electric motors must be started,
oversizing the cable is advisable.
The voltage drop across a cable can be determined as
follows:
e = Voltage drop (V)
I = Rated current (A)
L = Length of conductors (m)
R = Resistance (Ω/km to VDE 0102)
X = Reactance (Ω/km to VDE 0102)
3.4.3 Connecting the power supply
In order to recharge the ESS or use it as an hybrid
solution, it is necessary to connect the ESS to a
external power supply, either to the mains or to a
genset.
3.4.3.1 Connecting to the mains
Use the inlet socket or powerlocks to connect the ESS
to the mains. Please use the correct cable section and
protection according to local requirements.
3.4.3.2 Connecting to a genset
Use the inlet socket or powerlocks to connect the
power cables from the genset to the ESS. Please use
the correct cable section and protection according to
local requirements.
Also connect the start and stop connector X30 to
remote start and stop the genset, the ESS provides a
volt free contact.
Wire section Max. current (A)
(mm
²
)
Multiple core Single core H07 RN-F
2.5 22 25 21
4303328
6384236
10 53 57 50
16 71 76 67
25 94 101 88
35 114 123 110
50 138 155 138
70 176 191 170
95 212 228 205
e
3IL R ϕcos⋅ X ϕsin⋅+()⋅⋅ ⋅
1000
------------------------------------------------------------------------------=
The genset connected to the ESS
must be isochronous mounting
electronic governor or electronic
control module.
00_00_ZBP45_EN.book Page 24 Monday, October 19, 2020 9:52 AM
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