You Have Discovered a Common Mode Current on the Metallic

question 27

Multiple Choice

You have discovered a common mode current on the metallic cable sheaths of your building riser cables. What is the MOST likely cause for you to investigate?

• A) Lack of cable protection
• B) Two separate and distinct ground references
• C) Improper secondary protection
• D) Improper physical protection of cable
• E) Improper placement and/or termination of cables

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Definitions:

Magma

Molten rock located beneath the Earth's surface, which can form igneous rocks when it cools and solidifies.

Passive Margin

A continental margin that is not associated with a plate boundary and generally experiences less tectonic activity, often featuring thick sediment deposits.

Supercontinent

A massive landmass consisting of all, or nearly all, of the Earth's continents merged together, which has formed and broken apart several times in Earth's history.

Rodinia

An inferred supercontinent, consisting of all the continents joined, that existed near the Precambrian-Paleozoic boundary.