3.4.4 Battery installation
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).
3.5. Protection for individuals and equipment
3.5.1 Earth connection
For effective protection against electric shocks, the generating set needs to be earthed. To do this, use a copper wire, with a minimum
cross-section of 25 mm
2
for a stripped cable and 16 mm
2
for an insulated cable, connected to the generating set earth socket and a
galvanised steel earthing rod embedded vertically into the ground.
The earthing rod resistance value should comply with the values shown in the table below.
Note: use the highest differential setting from the installation as a guideline.
The resistance value is calculated in the following way:
R = Ul
I Δn
Maximum resistance value of the earth socket R (Ω) according to the differential unit operational
current (operation time should not be longer than 1 second).
I Δn
differential
Earth R
(Ω)
Ul: 50 V
Earth R
(Ω)
Ul: 25 V
≤ 30 mA 500 > 500
100 mA 500 250
300 mA 167 83
500 mA 100 50
1A 50 25
3A 17 8
5A 10 5
10A 5 2.5
The Ul value: 25 V is required for work site installations, and livestock buildings, etc.
generating set earth socket
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