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最新的 NABCEP Board PVIP 免費考試真題:

1. A PV system's inverter displays a ground-fault error. What is the first troubleshooting step?

A) Inspect AC wiring
B) Verify DC disconnect operation
C) Check array insulation resistance
D) Replace the inverter

2. When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?

A) Determine possible sources electrical supply an avoid exposure to energized conductors or parts.
B) Verify that disconnecting device blades are closed and test conductors using an adequately rated detector.
C) Apply lockout/tagout devices and install a listed isolation transformer.
D) Mount inverters on nonconductive supports and temporarily ground one dc circuit conductor.

3. When installing a ground-mounted PV array, which of the following grounding methods complies with NEC Article 690 requirements for equipment grounding?

A) Using a grounding electrode conductor connected to a separate ground rod for each array
B) Bonding all metal parts to the equipment grounding conductor tied to the main service ground
C) Installing a ground-fault circuit interrupter (GFCI) on the DC side of the system
D) Connecting the module frames to the racking with bare copper wire only

4. A PV system has a 1000V DC array feeding a transformerless inverter. What is the minimum insulation rating for the DC conductors per NEC 690.35?

A) 1000V
B) 600V
C) 2000V
D) 1500V

5. Aerial lifts used to hoist equipment and PV modules to roof levels may be field modified for uses other than those intended by the manufacturer with which approval or certification?

A) Approval by the local AHJ for meeting safely regulations
B) Certified via the state material handling safely statutes
C) Tested and approval by the distributor of the equipment
D) Certified in writing by the manufacturer or an NRTL

問題與答案：