RCDD · Question #111
Surge currents due to lightning and other sources MUST be ________ before they penetrate the infrastructure.
The correct answer is D. Equalized. Surge currents from lightning and other sources must be equalized - brought to the same electrical potential as the building ground - before they can enter and damage the internal infrastructure.
Question
Surge currents due to lightning and other sources MUST be ________ before they penetrate the infrastructure.
Options
- AShorted
- BMaximized
- CTerminated
- DEqualized
How the community answered
(63 responses)- A3% (2)
- B13% (8)
- C8% (5)
- D76% (48)
Why each option
Surge currents from lightning and other sources must be equalized - brought to the same electrical potential as the building ground - before they can enter and damage the internal infrastructure.
Shorting surge currents creates an uncontrolled direct current path and does not safely dissipate the energy away from the infrastructure.
Maximizing surge currents is the opposite of the goal and would increase damage potential to connected equipment.
Termination in this context refers to impedance matching for signal integrity, not a method for diverting or neutralizing surge energy.
Equalization means bringing all conductive paths to the same electrical potential through bonding and grounding at the building entrance, eliminating the voltage differences that cause surge energy to flow destructively through equipment. This is accomplished via the entrance facility bonding busbar connected to the building grounding electrode system. Without equalization, differential surge voltages travel along cabling into sensitive electronics.
Concept tested: Surge current equalization at building entrance facility
Source: https://www.tiaonline.org/standard/tia-607/
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