ITPEC FE Morning April 2020 Question 57

A surge protection device (SPD) between the communication cable and the computer — it diverts the lightning-induced voltage spike before it reaches the equipment.

A lightning strike near a building induces a brief but very high voltage on power and communication lines. An SPD, also called a surge protector or arrester, conducts that excess voltage to ground and lets normal signals through, so the connected devices are not damaged. It is installed on every line entering the equipment, including network and telephone cables, not only on the power supply.

Answer (a)

Why not others:

• •(b) — digitalizing the control circuits of power facilities changes how they are controlled; it does not stop a surge, and digital circuits are if anything more sensitive to one
• •(c) — a private generator supplies power during an outage, a different problem from over-voltage
• •(d) — two communication routes on different paths give redundancy if one line is cut, but a surge can still enter through either line

Key rule: Match the facility measure to the power problem: SPD for surges from lightning, UPS for momentary drops and short outages, generator for long outages, route diversity for line cuts.

Service Management · AI-written, may contain errors