Class 2 (2nd Engineer) MET 📅 Dec 2024

Exam Question

With reference to a three-phase shipboard electrical distribution system: (16)

(a) Enumerate the advantages of an insulated neutral system.

(b) Enumerate the disadvantages of an insulated neutral system.

(d) Compare the use of an insulated neutral system as opposed to the use of an Earthed neutral system with regard to the risk of electric shock from either system.

Reference Answer

(a) Advantages of an insulated neutral system:
In the event of a single earth fault, no earth fault current flows through the ship's hull due to the insulated neutral, minimizing fire hazards.
The hull does not carry current, ensuring safety from electrical currents passing through the structure.
A single earth fault does not cause generator breaker tripping, avoiding sudden blackouts or operational disruptions.

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play