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NETA level II exam with Verified Answers Graded A+

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NETA level II exam with Verified Answers Graded A+ 1. What is the preferred method of performing primary-injec- tion testing on a low voltage circuit breaker with ground fault protection? 2. At what current level does ventricular fibrillation occur? 3. What is the LET-GO current threshold?...

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Publié le 9 septembre 2024
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Écrit en 2024/2025
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NETA level II exam with Verified Answers Graded A+

1. What is the preferred method Use of the manufacturer's test kit or rewiring
of performing primary-injec- the neutral CT input is the preferred method
tion testing on a low voltage of primary-injection testing on a low voltage
circuit breaker with ground circuit breaker with ground fault protection,
fault protection? otherwise two poles can be connected in
series to provide balanced secondary cur-
rents to the trip unit.

2. At what current level does -60 to 100mA in AC systems
ventricular fibrillation occur? -300 to 500mA in DC systems

3. What is the LET-GO current For a 70kg body
threshold? 75mA DC
15mA AC

4. Meter Sockets and meter dis- FALSE
connect switches should be (NEC Article 230.82)
connected on the load side
of a service disconnecting
means.

5. Which standard addresses NFPA 70 (National Electric Code)
equipment grounding?

6. A moving iron meter operates Operating current ( can be AC or DC)
by applying current to
the coil.

7. What is the maximum devia- 50% of the lowest value
tion between resistance mea- (MTS 7.20.3.1)
surements on bolted connec-
tions?

8. Removable / Drawout cir- Identify the electrical symbol shown:
cuit breaker Normally 5kV or
above

, NETA level II exam with Verified Answers Graded A+

9. Resistance grounding is used 6.6kV and greater
for voltages:

10. Medium-voltage motor Blowout coils may be used to extinguish the
starters use blowout coils. arc by means of a magnetic blast. The arc
What do these do? created when the contacts open is subject-
ed to the action of a magnetic field set up
by coils connected in series with the circuit
being interrupted.
These coils are called blowout coils be-
cause they help blow out the arc magneti-
cally. The arc is magnetically blown into arc
chutes where the arc is lengthened, cooled,
and extinguished.

11. Medium voltage air circuit Puffer tubes incorporate the operating
breakers use PUFFER TUBES. mechanism to blow a puff of air through a
What do these do? tube and nozzle to each contact assembly
when the breaker is opened. The air helps
quench the arc by pushing it up into the
arc-chute.

12. Ammeter Identify the electrical symbol shown:

13. SAE grade 1 & 2 Bolt

, No lines on head
Tensile strength 64KSI
14. SAE grade 5 Bolt 3 lines on head
Tensile strength 105 KSI

15. SAE grade 7 Bolt 5 lines on head
Tensile strength 133 KSI

16. SAE grade 8 Bolt 6 lines on head
Tensile strength 150 KSI

17. NFPA 70B 11.27.3 Decal color (Non-serviceable) - Device has a problem
code RED detrimental to its proper electrical or me-
chanical operation such as no trip on one
or more phases or high contact resistance
readings. This device should not be placed
back into service.

18. NFPA 70B 11.27.3 Decal color (Limited Service) - Device has a minor prob-
code yellow lem that does not impact equipment ser-
viceability but should be fixed as soon as
possible. Some examples of minor prob-
lems include slightly lower than acceptable
insulation resistance readings or chipped
arc chutes.

19. NFPA 70B 11.27.3 Decal color (Servicable) - Device is electrically and me-
code white chanically sound and suitable for service
but may still have minor defects such as
slight corrosion or incorrect circuit ID.

20.

, What instructions govern the ANSI/IEEE standard 399
performance of a SHORT CIR- Step by step procedures outlined in the
CUIT STUDY? short circuit calculation chapters of IEEE
standard 141 and ANSI/IEEE 242.

21. What instructions govern the ANSI/IEEE STANDARD 399
performance of a Coordina- ANSI/IEEE STANDARD 242
tion STUDY? NFPA 70 (NATIONAL ELECTRIC CODE)
protective devices

22. Two standards are typically IEEE C37.1
used for the interconnection IEC 61850
of smart devices in a substa-
tion environment. One is an
IEC standard, the other is an
IEEE standard. What are the
two standards?

23. Time travel analysis is com- is used on medium and high-voltage cir-
monly performed on: cuit breakers and provides information as
to whether the breaker's operating mecha-
nism is operating properly (NFPA 70B).

24. Which of the following is not 3. 96 VDC
a standard dc power source
voltage?
1. 24VDC
2. 48VDC
3. 96VDC
4. 125VDC
5. 250VDC

25. Medium-voltage is defined by greater than 1,000 volts and less than
NETA as 100,000 volts

26. Low-voltage is defined by less than 1,000 volts
NETA as

27. High-voltage and Extra-High greater than 100kV and less than 1,000kV
voltage is defined by NETA as

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