LMS Substation 3-2 Practice Test 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 420

How does a good grounding system affect the voltage to earth of an electrical system?

It increases the maximum voltage limit.

It limits the voltage to a definite value.

A good grounding system plays a crucial role in the safety and functionality of an electrical system by maintaining the voltage to earth at a definite value. This is particularly important in the event of a fault condition. When a fault occurs, such as a short circuit, the grounding system helps to provide a path for the fault current to flow safely to the earth. This minimizes the rise in voltage to ground, protecting both equipment and personnel from electric shock and damage.

By limiting the voltage to a specific, manageable level, the grounding system reduces the risk of arcing or equipment failure. This is achieved through effective connections to the ground, which can dissipate excess energy and maintain system stability. Therefore, the presence of a well-designed grounding system is essential for controlling the earth voltage and ensuring that it remains within safe limits during normal operation and fault conditions.

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It has no effect on voltage levels.

It can only lower the voltage slightly.

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