Master Electrician Exam (NEC)Special Occupancies, Equipment, and ConditionsEasy
A master electrician is installing a new solar photovoltaic (PV) system on a residential property. The system includes PV modules, an inverter, and a battery energy storage system. Which of the following statements is true regarding the marking requirements for the system's disconnecting means?
- AThe marking is only required if the PV system is capable of operating in an island mode.
- BThe disconnecting means for the PV system must be marked 'PHOTOVOLTAIC SYSTEM DISCONNECT' only if it is located indoors.
- COnly the main service disconnect requires permanent marking, not the PV system disconnect.
- DThe disconnecting means for the PV system must be permanently marked to indicate whether it is AC or DC and its nominal voltage and maximum current.
Show answer & explanationAnswer & explanation
Correct answer: D. The disconnecting means for the PV system must be permanently marked to indicate whether it is AC or DC and its nominal voltage and maximum current.
NEC 690.13(A) requires all PV system disconnecting means to be permanently marked to identify them as PV system disconnects and to indicate whether they are AC or DC and their nominal voltage and maximum current. This ensures proper identification and safety during maintenance or emergency.
Why the other options are wrong
- A. The marking requirements apply to all PV system disconnects, not just those capable of island mode operation.
- B. Marking is required regardless of indoor or outdoor location for safety and identification.
- C. PV system disconnects have specific marking requirements in addition to the main service disconnect.
PV System Disconnect Marking
Permanent labels on photovoltaic (PV) system disconnects indicating their type (AC/DC), nominal voltage, and maximum current for safety.
- Required by NEC 690.13(A)
- Must specify AC or DC
- Must include nominal voltage and maximum current
Memory trick: PV disconnects need labels like a sunbather needs sunscreen for safety.