Surge Protective Devices Quiz

What is a Voltage Surge?

• A voltage surge is a gradual increase in electrical voltage.
• A voltage surge is a sudden increase in electrical voltage that exceeds normal levels.
• A voltage surge is a decrease in electrical voltage.
• A voltage surge is a type of electrical current that flows continuously.

What are the four types of voltage surges?

• Harmonic surges. thermal, lightning, surges

• Surges from power outages ,harmonic, thermal, lightning

• Lightning surges, Switching surges, Inductive surges, Electrostatic discharges
• Thermal surges, surges, switching, harmonic, power surges

What is the maximum surge current (I_MAX) for impulse wave 8/20μs?

• 5 kA for 8/20μs impulse waves.
• 10 kA for 8/20μs impulse waves.
• 3 kA for 8/20μs impulse waves.
• Typically around 8 kA for 8/20μs impulse waves.

What is the nominal discharge current (I_N) for Type 2 SPDs?

• 15 kA

• 30 kA

• 50 kA
• 20 kA

What is the maximum continuous operating voltage (U_C) for SPDs?

• 230V for residential and 400V for industrial applications.

• 1000V for industrial applications
• 600V for residential use only
• 150V for all applications

What is the voltage protection level (U_P) for SPDs?

• The voltage protection level (U_P) is the minimum voltage required for SPDs to operate.
• the maximum voltage that can appear across the SPD terminals during a surge.

• U_P is the average voltage that SPDs can handle continuously.
• The voltage protection level (U_P) is the voltage rating of the SPD under normal conditions.

What is the short circuit current rating (SCCR) for SPDs?

• The SCCR for SPDs is always 10 kA regardless of the device.
• SPDs do not have a short circuit current rating.
• The SCCR for SPDs is measured in volts instead of kiloamperes.
• The SCCR for SPDs varies by device, but it is typically rated in kA (kiloamperes) and must meet the requirements of the installation.

What are the technologies used in SPDs?

• metal oxide varistors (MOVs), gas discharge tubes (GDTs), and transient voltage suppression (TVS) diodes.

• Capacitive voltage dividers (CVD)
• Silicon carbide transistors (SiC)
• Inductive load switches (ILS)

What is the recommended method for connecting to equipment?

• Use compatible cables and connectors, following safety protocols.
• Only use wireless connections for all equipment.
• Connect without checking safety protocols.
• Use any type of cable regardless of compatibility.

What is the additive effect of the inductive voltage drop to the SPD's protection level?

• The inductive voltage drop can increase the SPD's protection level requirement.
• The inductive voltage drop is irrelevant to the SPD's performance.
• The inductive voltage drop decreases the SPD's protection level requirement.
• The inductive voltage drop has no effect on the SPD's protection level.