JCB EcoMAX Engine Installation Manual
© JCB Power Systems Ltd. 320/A9164-1 Page 35 of 64
12.9 Electrical Load
When calculating total machine load consideration should be given to the engine electrical
consumption including the aftertreatment components. For a 12 volt system for design
purposes it should be assumed that the ECU and Fuel Pump can draw up to 15 Amps
continuous current draw and the aftertreatment system can consume 10 Amps with an
additional 10 Amps for the heated lines consumption.
For further advice on the power requirements for various sub-systems please contact the
JCB applications engineering department.
12.10 Wiring
All wiring in the engine bay must have insulation that can withstand temperatures up to
150°C (Class D wiring to ISO Standard 6722, JCB Standard 7000/3400). The wiring must
also be resistant to Diesel, moisture and lubricating oil.
Battery cables must be as short as possible. The minimum recommended cross-section is
95 mm
2
.
The starter motor must be earthed to the equipment chassis and also directly back to battery
negative with a cable of adequate cross-section. The minimum recommended cross-section
is 95 mm
2
.
The alternator wiring must have a cross sectional area of at least 16 mm
2
for 24 V systems
and 25 mm
2
for 12 V systems dependent upon the alternator specification. See JCB
Standards 00127 & 00137.
12.11 Earthing
Voltage drop on a 12 V system between any earth, or component negative terminal and the
negative terminal of the battery must not be greater than 0.5 V, measured whilst cranking.
Similarly, the voltage drop between any component positive terminal and the battery’s
positive terminal must not be greater than 0.5 V under similar conditions. In each case, for
24 V systems a limit of 1.0 V is used instead of 0.5 V. You need to account for the voltage
drop across battery isolators, where fitted.
12.12 Switches and Sensors
All engine related switches and sensors must be of the insulated earth type.
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