Renewable Energy Technologies — Texas Journeyman Practice Questions

4 questions · 3% of the NEC Knowledge exam

Worked questions

1. A battery energy-storage system lacks a clearly identified means to isolate its power circuits. What is required?

Provide the listed and identified disconnecting means required for the system
BRely on opening the utility service
CRemove hazard markings
DUse software shutdown as the only isolation

Why A is correct

Stored-energy equipment can remain energized after utility disconnection. Listed disconnecting and shutdown provisions, identification, and manufacturer instructions must address the battery source itself.

2. A PV inverter AC disconnect is open while sunlight reaches the array. What must the worker assume about source-circuit conductors?

AThey become equipment-grounding conductors
PV conductors can remain energized
CThey are safe to short with unrated tools
DThey are de-energized because AC is open

Why B is correct

PV modules produce DC whenever illuminated. Opening the AC side or stopping the inverter does not necessarily remove source-circuit voltage, so identification, disconnecting, test, and PPE procedures must address both sources.

3. What is the principal purpose of rapid shutdown for PV circuits on buildings?

Reduce responder exposure to energized conductors
BEliminate all equipment grounding
CReplace array overcurrent protection for the renewable-energy system shown on the plans
DIncrease daily energy production

Why A is correct

PV conductors can remain energized whenever illuminated. Rapid shutdown limits voltage in specified array and building zones to reduce hazards for emergency response and service work.

4. What should an energy-storage-system disconnect clearly identify?

AOnly the battery cabinet color
The circuits and energy sources controlled by the disconnect
CThe utility's monthly rate
DOnly the installing employee

Why B is correct

Energy storage can remain energized from batteries when other sources are off. Disconnects, diagrams, and markings must clearly communicate controlled sources, locations, and shutdown sequence.

Practice all 4 Renewable Energy Technologies questions

Plus timed mock exams and a wrong book that follows you between the web and the app.

Start studying free