3.4. Electricity
a) Connections - general information
As with low voltage electrical installations, use and maintenance is governed by standard NFC 15.100 (France) or by the standards
in the relevant country, based on international standard IEC 60364-6-61.
They must also adhere to the regulations in the NFC 15.401 application guide (France) or to the regulations and standards in the
relevant country.
b) Power cables
These can be unipolar or multipolar according to the power of the generating set.
Power cables should preferably be installed in ducts or on a cable tray for this purpose.
The cable cross-section and number of cables should be determined according to the cable type and the current standards to be
observed in the country of installation. The choice of conductors must comply with international standard
IEC 30364-5-52.
Three phase - Calculation hypothesis
Fitting method = wiring in cable runs or non perforated trays.
Permissible voltage drop = 5%
Multiconductors or single conductor joined when precision 4X…(1)
Cable type PVC 70°C (e.g. H07RNF).
Ambient temperature = 30°C.
Circuit breaker
calibre
(A)
Cable sizes
0 - 50m 51 - 100m 101 - 150m
mm²/AWG mm²/AWG mm²/AWG
10 1.5 / 14 2.5 / 12 4 / 10
16 2.5 / 12 4 / 10 6 / 9
20 2.5 / 12 4 / 10 6 / 9
25 4 / 10 6 / 9 10 / 7
32 6 / 9 6 / 9 10 / 7
40 10 / 7 10 / 7 16 / 5
50 10 / 7 10 / 7 16 / 5
63 16 / 5 16 / 5 25 / 3
80 25 / 3 25 / 3 35 / 2
100 35 / 2 35 / 2 4X(1X50) / 0
125 (1) 4X(1X50) / 0 4X(1X50) / 0 4X(1X70) / 2/0
160 (1) 4X(1X70) / 2/0 4X(1X70) / 2/0 4X(1X95) / 4/0
250 (1) 4X(1X95) / 4/0 4X(1X150) / 2350MCM 4X(1X150) / 2350MCM
400 (1) 4X(1X185) / 0400MCM 4X(1X185) / 0400MCM 4X(1X185) / 0400MCM
630 (1) 4X(2X1X150) / 2x 2350MCM 4X(2X1X150) / 2x 2350MCM 4X(2X1X150) / 2x 2350MCM
Single phase - Calculation hypothesis
Fitting method = wiring in cable runs or non perforated trays.
Permissible voltage drop = 5%
Multiconductors.
Cable type PVC 70°C (e.g. H07RNF).
Ambient temperature = 30°C.
Circuit breaker
rating (A)
Cable sizes
0 - 50m 51 - 100m 101 - 150m
mm²/AWG mm²/AWG mm²/AWG
10 4 / 10 10 / 7 10 / 7
16 6 / 9 10 / 7 16 / 5
20 10 / 7 16 / 5 25 / 3
25 10 / 7 16 / 5 25 / 3
32 10 / 7 25 / 3 35 / 2
40 16 / 5 35 / 2 50 / 0
50 16 / 5 35 / 2 50 / 0
63 25 / 3 50 / 0 70 / 2/0
80 35 / 2 50 / 0 95 / 4/0
100 35 / 2 70 / 2/0 95 / 4/0
125 50 / 0 95 / 4/0 120 / 2250MCM
c) Battery cables
Install the battery or batteries in the immediate vicinity of the electric starter motor. The cables will be connected directly from the
battery terminals to the starter motor terminals.
The primary instruction to follow is to ensure that the polarities between the battery and starter motor match. Never reverse the
positive and negative battery terminals when connecting them. This could cause severe damage to the electrical equipment.
The minimum cross-section of the cables will be 70 mm
2
. It varies according to the power of the starter motor but also the distance
between the batteries and the set (voltage drops on the line).
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