NABCEP PV Installer Specialist

Before beginning work on a PV installation project, what is the FIRST step in developing a site-specific safety plan?

• AOrdering all materials and equipment for the project
• BConducting a thorough job hazard analysis (JHA) of the work site
• CInstalling temporary fall protection anchors on the roof
• DConnecting the inverter to the electrical panel

According to OSHA standards, at what height above a lower level must fall protection be provided for workers in the construction industry?

• A4 feet
• B6 feet
• C8 feet
• D10 feet

A site-specific safety plan for a rooftop PV installation should include which of the following elements?

• AThe customer's utility billing history
• BEmergency contact information, evacuation routes, and location of nearest hospital
• CThe anticipated energy production of the PV system
• DThe manufacturer's financial warranty terms

Which document must be readily available on the job site to communicate chemical hazards to PV installation workers?

• AThe building permit
• BSafety Data Sheets (SDS)
• CThe system design drawings
• DThe equipment purchase orders

When developing a safety plan for a PV installation, what is the purpose of a lockout/tagout (LOTO) procedure?

• ATo prevent unauthorized access to the customer's home
• BTo ensure hazardous energy sources are isolated and de-energized before maintenance or in…
• CTo lock the PV modules to the racking system
• DTo tag equipment for warranty tracking purposes

What is the minimum OSHA training requirement that NABCEP requires for PVIS certification candidates?

• AOSHA 30-Hour Construction Industry training
• BOSHA 10-Hour Construction Industry Outreach training
• COSHA 8-Hour HAZWOPER refresher training
• DOSHA 40-Hour HAZWOPER training

A safety plan should specify the frequency of toolbox talks (safety meetings) during a PV installation project. What is the recommended practice?

• AOnce at the beginning of the project only
• BDaily, before the start of each work shift
• CWeekly, on Monday mornings
• DOnly when an accident occurs

When creating a safety plan for a residential rooftop PV installation, which factor is MOST critical to assess regarding the existing roof structure?

• AThe color of the roofing material
• BThe structural load-bearing capacity and condition of the roof
• CThe age of the homeowner's insurance policy
• DThe brand of shingles installed

What type of personal protective equipment (PPE) is ALWAYS required when working on an energized PV system?

• ASteel-toed boots only
• BVoltage-rated insulating gloves appropriate for the system voltage
• CA hard hat with a face shield
• DChemical-resistant coveralls

When working near the edge of a flat commercial roof during a PV installation, which fall protection method provides a warning line but does NOT prevent a fall?

• APersonal fall arrest system (PFAS)
• BGuardrail system
• CWarning line system
• DSafety net system

What is the primary electrical hazard unique to PV systems that differs from conventional electrical work?

• APV systems use three-phase power exclusively
• BPV modules cannot be fully de-energized as long as they are exposed to light
• CPV systems operate at extremely high frequencies
• DPV inverters produce dangerous levels of electromagnetic radiation

An installer notices damaged insulation on a PV source circuit conductor during installation. What is the correct action?

• AWrap the damaged area with standard electrical tape and continue installation
• BRemove and replace the damaged conductor before energizing the circuit
• CApply silicone sealant over the damaged area
• DLeave it and note the damage in the project documentation

According to OSHA, what is the minimum safe approach distance for unqualified workers near overhead power lines carrying up to 50 kV?

• A3 feet
• B5 feet
• C10 feet
• D20 feet

What is the purpose of a Ground Fault Circuit Interrupter (GFCI) when used with power tools on a PV installation site?

• ATo increase the voltage output of the power tool
• BTo protect against electrical shock by detecting imbalances between the hot and neutral c…
• CTo prevent the power tool from overheating
• DTo reduce electromagnetic interference from the PV array

During a rooftop PV installation in summer, an installer begins showing signs of confusion, hot dry skin, and rapid pulse. What condition is this, and what is the immediate action?

• AHeat exhaustion — have the worker drink cold water and rest in the shade
• BHeat stroke — call 911 immediately and begin cooling the worker with water or ice
• CDehydration — provide electrolyte drinks and continue working
• DSunburn — apply sunscreen and provide shade

What is the OSHA-required capacity for an anchor point used with a personal fall arrest system (PFAS)?

• A1,000 pounds per attached worker
• B3,600 pounds per attached worker
• C5,000 pounds per attached worker, or designed with a safety factor of 2 under a qualified…
• D500 pounds per attached worker

When lifting PV modules onto a roof, which practice BEST reduces the risk of musculoskeletal injury?

• AHaving one person carry modules up a ladder individually
• BUsing mechanical lifting equipment such as a module hoist or crane
• CThrowing modules from ground level to a worker on the roof
• DStacking all modules on the roof at once before installation begins

Arc flash hazard is a concern when working on PV systems. Which factor MOST increases the severity of an arc flash event?

• ALower ambient temperature
• BHigher available fault current and longer clearing time
• CUsing copper conductors instead of aluminum
• DInstalling modules in a landscape orientation

What is the primary purpose of EMT (Electrical Metallic Tubing) in a PV installation?

• ATo serve as the equipment grounding conductor only
• BTo provide physical protection for electrical conductors
• CTo increase the voltage capacity of the conductors inside
• DTo reduce electromagnetic interference from the PV modules

When installing rigid metal conduit (RMC) for a PV system, what is the maximum number of degrees of bends permitted between pull points?

• A180 degrees
• B270 degrees
• C360 degrees
• D90 degrees

What type of conduit is commonly used for underground runs from a ground-mounted PV array to the electrical building?

• AEMT (Electrical Metallic Tubing)
• BFMC (Flexible Metal Conduit)
• CSchedule 40 or Schedule 80 PVC conduit
• DENT (Electrical Nonmetallic Tubing)

When sizing conduit for PV circuit conductors, what is the maximum conduit fill percentage allowed for three or more conductors per NEC Chapter 9, Table 1?

• A31%
• B40%
• C53%
• D60%

What is the purpose of an expansion fitting in a conduit run for a PV installation?

• ATo allow conductors to be added or removed easily
• BTo accommodate thermal expansion and contraction of the conduit due to temperature changes
• CTo increase the conduit diameter at transition points
• DTo provide additional support for heavy conductors

Per NEC requirements, how must conduit be supported and secured when installed on the exterior of a building for a PV system?

• AConduit does not require support if it is less than 10 feet long
• BConduit must be supported within 3 feet of each box, fitting, or enclosure and at interva…
• CConduit must only be supported at the endpoints
• DConduit is self-supporting and requires no additional hardware

When installing liquidtight flexible metal conduit (LFMC) for a PV system connection to a roof-mounted inverter, what is the maximum length typically permitted by the NEC for flexibility?

• A3 feet
• B6 feet
• C10 feet
• DNo length limit applies

What is the primary function of a PV combiner box in a solar installation?

• ATo convert DC power to AC power
• BTo combine multiple PV source circuits into a single PV output circuit
• CTo store excess solar energy in batteries
• DTo monitor individual module performance

When installing a string inverter for a residential PV system, what is the recommended minimum clearance around the inverter for proper ventilation and maintenance access?

• ANo clearance is needed if the inverter is UL listed
• BThe clearances specified in the manufacturer's installation manual
• C12 inches on all sides regardless of manufacturer
• DOnly the top needs clearance for heat dissipation

What is the NEC requirement for the working space depth in front of a PV disconnect switch rated at 240V?

• A24 inches
• B30 inches
• C36 inches
• D48 inches

When installing a rapid shutdown system per NEC 690.12, what must happen to conductors more than 1 foot from the PV array within 30 seconds of rapid shutdown initiation?

• AThey must be reduced to 30 volts or less
• BThey must be reduced to 80 volts or less
• CThey must be completely disconnected from all power sources
• DNo voltage reduction is required outside the array boundary

What type of disconnect is required by the NEC to be installed at a readily accessible location for a PV system?

• AA disconnect for each PV source circuit only
• BA PV system disconnecting means that simultaneously disconnects all ungrounded conductors
• CA single-pole switch on the grounded conductor only
• DNo disconnect is required if the inverter has a built-in shutdown

When mounting electrical equipment such as a PV combiner box or disconnect on an exterior wall, what is the primary concern regarding the mounting location?

• AAesthetic appearance from the street
• BProtection from weather, direct sunlight, and physical damage while maintaining required…
• CProximity to the nearest window for visual monitoring
• DMatching the color of the equipment to the building exterior

What type of overcurrent protection device is typically used in a PV combiner box to protect individual string circuits?

• AGround fault circuit interrupter (GFCI)
• BTouch-safe fuse holders with PV-rated fuses
• CStandard residential circuit breakers
• DSurge protective devices (SPDs)

Where does NEC 690.31(A) require PV source circuit and PV output circuit conductors to be installed?

• AOnly in metallic raceways
• BIn raceways, cable trays, as Type MC cable, Type TC cable, or other wiring methods includ…
• COnly as direct-buried cables
• DOnly as open wiring on insulators

What type of wire is specifically listed for use as exposed single-conductor wiring within a PV array?

• ATHWN-2
• BUSE-2 or PV Wire
• CNM-B (Romex)
• DXHHW

Per NEC 690.8, PV source circuit conductors must be sized to carry not less than what percentage of the maximum circuit current (Isc)?

• A100%
• B112%
• C125%
• D156%

When pulling conductors through conduit for a PV DC circuit, what is the maximum recommended pulling tension to avoid damaging the conductor insulation?

• AThere is no limit as long as the conductors fit
• BThe pulling tension should not exceed the conductor manufacturer's specifications, typica…
• C50 pounds regardless of conductor size
• D200 pounds for all conductor sizes

What is the correct method for terminating stranded copper conductors in PV system terminal blocks and lugs?

• ATwist the strands tightly by hand and insert into the terminal
• BUse a properly sized crimp terminal or lug, crimped with the correct crimping tool per th…
• CSolder the strands together and insert into the terminal
• DWrap the conductor end with electrical tape before insertion

Per NEC 690.31(G), PV source circuit and output circuit conductors installed inside a building must be which of the following?

• AInstalled as open wiring on insulators
• BInstalled in metal raceways or metal-clad cable, or limited to 10 feet with appropriate m…
• CInstalled in PVC conduit only
• DNo special requirements apply inside buildings

When labeling DC PV conductors in a raceway, what color is typically used for the positive ungrounded conductor?

• AWhite or gray
• BGreen or green with yellow stripe
• CRed
• DBlue

What is the significance of the MC4 connector in PV installations?

• AIt is a type of conduit fitting for metallic conduit
• BIt is a standardized quick-connect/disconnect connector used to interconnect PV modules i…
• CIt is a mounting clip for attaching modules to rails
• DIt is a type of circuit breaker used in combiner boxes

For a 240V single-phase residential PV system with a grid-tied inverter, what size AC conductors are typically required for a 7.6 kW inverter with a maximum output current of 32A?

• A14 AWG copper (rated for 15A)
• B12 AWG copper (rated for 20A)
• C10 AWG copper (rated for 30A)
• D8 AWG copper (rated for 40A)

When connecting a PV inverter to the main service panel using the supply-side connection method per NEC 705.12(A), where are the AC conductors connected?

• ATo a breaker in the main panel busbar
• BTo the line side of the main service disconnecting means
• CTo a subpanel dedicated to the PV system
• DTo the meter socket directly

What is the '120% rule' as it applies to load-side PV interconnections per NEC 705.12(B)(2)(3)?

• AThe PV breaker must be rated at 120% of the inverter output current
• BThe sum of the main breaker rating and the PV backfeed breaker rating cannot exceed 120%…
• CThe AC wire from the inverter must be oversized by 120%
• DThe inverter efficiency must be at least 120% of the load

When installing AC output conductors from a PV inverter, what is the maximum recommended voltage drop for the branch circuit to minimize power losses?

• A1%
• B2%
• C3%
• D5%