BICSI OSP Design Practice Test

The vertical down lead (VDL) of the MGN is an acceptable ground.

False True Not Acceptable Ground Unknown

Correct Answer:

True

Explanation:

The main idea here is that a reliable ground comes from a continuous, low-impedance path to earth provided by the bonding of the Main Grounding Network to the grounding electrode system. The vertical down lead is the conductor that takes the MGN down to the earth, terminating at a grounding electrode. When this lead is properly sized, securely connected, and bonded to both the MGN and the electrode, it delivers the required low-impedance path to earth. That makes it an acceptable ground for the MGN. If the lead isn’t bonded to an electrode or is undersized or poorly connected, it wouldn’t be an acceptable ground, but with correct installation it is.

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