Earth Fault alarm triggered shortly after the Cargo Booster pump started. After the pump is stopped, the insulation slightly improves but readings are still low and fluctuating.

Checks of Cargo and Booster pumps electric motors insulation are a part of the weekly and pre-arrival routine. What could be the probable cause of such a fault?

22 Oct '20, 07:22

Oct. 22, 2020, 7:22 a.m.
3Eng's gravatar image


Inspect the electric motor ant connection/junction box for moister/water accumulation.

Moisture is the most frequent cause of low insulation of the electric motors. This is especially related to el. motors located on the open deck.

Check the connection box cover seals. If they are worn, improperly installed, or tightened, significant amounts of water may accumulate.

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22 Oct '20, 07:46

Oct. 22, 2020, 7:46 a.m.
cheng's gravatar image

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