Marine Installation Manual
2022-03
3-20
3 Engine Installation
3.10 Propulsion shaft earthing
X62DF-S2.0
Figure 3
-
10 Typical shaft earthing arrangement
Position of earthing
device on shaft
The position of the earthing device must be as close as possible to the main en
-
gine’s flywheel. For installation of a PTO/PTI/PTH on the driving end side, the
earthing device must be placed between the PTO/PTI/PTH and the main en
-
gine’s flywheel.
Connecting
electric cables
The electric cables are connected as shown in
with the op
-
tional voltmeter. This instrument is at the discretion of the owner, but it is useful
to observe that the potential to earth does not rise above 100 mV.
Typical arrangement for the propeller shaft
A
A
1
2
3
4
5
6
7
8
9
10
11
12
Slip ring
Tension bands
Twin holder
Brushes
Connection to the ship’s hull
Steel spindle
Connection to the voltmeter
Mounting bracket
Insulated spindle
Single holder
Monitoring brush
Clamps
View on ‘A’ (brush gear omitted)
SM-0058
9
1
12
2
6
8
1
2
3
4
5
6
7
8
9
10
11
12
Section A-A
NOTE
An additional earthing device might be required to protect the shaft
bearings and the stern tube bearings. For detailed information please
contact the earthing device supplier.
