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NABCEP SH Associate practice questions

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Question 1Conducting a site analysis, including load analysis

During a residential site analysis, which document is the most reliable source for the actual monthly energy consumption of the past 12 months?

  1. The manufacturer's datasheet for the existing inverter
  2. The nameplate rating of the main service panel
  3. The homeowner's estimate of average monthly use
  4. The utility bill history for the service address Correct answer.

Explanation

Utility bill history gives measured consumption at the meter over time and is the primary basis for load analysis. Nameplate ratings describe capacity, not energy used, and customer estimates or equipment datasheets are not measurements.

Question 2Conducting a site analysis, including load analysis

A site analysis requires converting a customer's annual consumption of 10,800 kWh into an average daily value. What is the correct average daily energy use?

  1. 29.6 kWh per day Correct answer.
  2. 900 kWh per day
  3. 1.23 kWh per day
  4. 10,800 kWh per day

Explanation

Dividing annual energy by 365 days yields the average daily energy: 10,800 / 365 = 29.6 kWh per day. This average is the starting point for sizing a PV array against load.

Question 3Conducting a site analysis, including load analysis

Which load category is best described as continuous and predictable when performing a residential load analysis?

  1. Electric vehicle fast charging
  2. Seasonal air conditioning
  3. Refrigeration and standby electronics Correct answer.
  4. Well pump cycling

Explanation

Refrigerators and standby electronics draw power around the clock, so they form a steady baseline that is easy to model. Seasonal cooling, EV charging, and pump cycling are intermittent or weather-driven.

Question 4Conducting a site analysis, including load analysis

A site analyst wants to identify which appliances dominate a home's electricity use. Which approach gives the most useful breakdown?

  1. Reading the utility meter once at the start of the visit
  2. Monitoring individual circuits with a portable power logger over a representative week Correct answer.
  3. Counting the number of outlets in each room
  4. Reviewing the age of the service panel

Explanation

Circuit-level monitoring over a representative period separates large loads and reveals their duty cycles, which supports targeted efficiency recommendations. A single meter reading, outlet counts, or panel age cannot attribute energy to specific appliances.

Question 5Conducting a site analysis, including load analysis

In load analysis terminology, what does the term demand refer to?

  1. The rate of energy use at a given instant or averaged over a short interval Correct answer.
  2. The total energy consumed over a full billing year
  3. The sum of all appliance nameplate ratings in the building
  4. The maximum rated output of the PV array

Explanation

Demand is power, the instantaneous or short-interval rate of energy use, usually expressed in kW. Energy is the accumulated quantity in kWh, and array output or summed nameplates are not the same concept.

Question 6Conducting a site analysis, including load analysis

A load analysis shows a home with a large midday air-conditioning load and a PV array that produces most of its energy at midday. What does this load profile suggest?

  1. Battery storage is mandatory to make the system function
  2. A high fraction of PV production can be self-consumed on site Correct answer.
  3. The array must be oversized to twice the annual consumption
  4. The utility will reject the interconnection automatically

Explanation

When generation and load coincide in time, a large share of production is consumed directly, improving self-consumption. Storage is optional rather than mandatory, oversizing is not implied, and interconnection is not automatically rejected.

Question 7Conducting a site analysis, including load analysis

Which measurement is needed to determine a building's load profile shape over a 24-hour period?

  1. The square footage of the roof
  2. Interval power data recorded throughout the day Correct answer.
  3. The conductor ampacity of the service entrance
  4. The tilt angle of the proposed array

Explanation

A load profile is the variation of power over time, so interval data recorded across the day is required. Roof area, array tilt, and conductor ampacity describe the site or wiring, not the timing of consumption.

Question 8Conducting a site analysis, including load analysis

Why is a site analyst interested in the difference between summer and winter consumption in a building?

  1. It reveals seasonal load patterns that affect array sizing and expected self-consumption Correct answer.
  2. It sets the required number of rapid shutdown devices
  3. It determines the color of the module backsheet
  4. It proves the service panel is undersized

Explanation

Seasonal variation shows when loads peak relative to solar resource, which guides sizing and self-consumption estimates. It has no relationship to module appearance, panel adequacy, or rapid shutdown hardware counts.

Question 9Conducting a site analysis, including load analysis

A commercial site has a demand charge of $12 per kW based on the highest 15-minute interval of the month. Which load analysis finding matters most for reducing that charge?

  1. The number of lighting fixtures installed
  2. The average daily sun hours at the site
  3. The total annual energy consumption in kWh
  4. The timing and magnitude of the monthly peak demand interval Correct answer.

Explanation

Demand charges are driven by the peak interval, so identifying when and how large that peak is allows targeted reduction. Annual energy, fixture counts, and sun hours do not directly set the billed peak.

Question 10Conducting a site analysis, including load analysis

A load analysis finds a connected load of 40 kW but a measured peak demand of 14 kW. How should the analyst interpret this gap?

  1. The array must be sized to 40 kW to match the connected load
  2. The building needs a 40 kW service upgrade before any PV is considered
  3. Diversity means not all connected loads operate at once, so measured demand governs design Correct answer.
  4. The meter must be faulty because connected load always equals demand

Explanation

Diversity and load factors mean connected load is a worst-case sum that rarely occurs simultaneously. Measured peak demand is the realistic figure for sizing and interconnection discussions.

Question 11Conducting a site analysis, including load analysis

A household consumes 12,000 kWh per year and a proposed array is expected to produce 14,400 kWh per year. What is the estimated annual production-to-consumption ratio?

  1. 2.4
  2. 1.2 Correct answer.
  3. 0.12
  4. 0.83

Explanation

Dividing annual production by annual consumption gives 14,400 / 12,000 = 1.2, meaning production is 120 percent of use. This ratio helps the analyst judge self-consumption and export.

Question 12Conducting a site analysis, including load analysis

When estimating load from appliance nameplates, which adjustment is most important for a motor-driven appliance such as a pool pump?

  1. Applying a duty cycle and accounting for motor starting characteristics Correct answer.
  2. Multiplying the nameplate by the number of circuits in the panel
  3. Ignoring the appliance because motors do not draw real power
  4. Assuming the nameplate wattage runs continuously for 24 hours

Explanation

Motors run on duty cycles and draw higher current at startup, so both run hours and starting behavior must be reflected in the estimate. Assuming continuous operation overstates energy, and motors certainly draw real power.

Question 13Conducting a site analysis, including load analysis

A site analyst is reviewing 15-minute interval data and sees a recurring spike every weekday at 8 a.m. What is the most reasonable next step?

  1. Assume the spike is measurement noise and discard the data
  2. Recommend removing the service panel immediately
  3. Conclude that the data logger is malfunctioning
  4. Identify the equipment switching on at that time and confirm its contribution Correct answer.

Explanation

A repeatable weekday spike usually corresponds to a scheduled load such as HVAC recovery or process equipment startup. Confirming the source allows accurate modeling and possible load shifting.

Question 14Conducting a site analysis, including load analysis

Which factor most directly reduces the accuracy of estimating annual consumption by summing appliance nameplate wattages?

  1. Electricity is billed in kilowatt-hours rather than watts
  2. Appliances are never connected to branch circuits
  3. Nameplate wattages are always lower than actual draw
  4. Actual run hours and cycling differ from assumed full-load operation Correct answer.

Explanation

Nameplate methods depend on assumed run hours, and real appliances cycle, so errors accumulate quickly. Nameplates are generally conservative upper values, and billing units do not cause the inaccuracy.

Question 15Conducting a site analysis, including load analysis

A homeowner plans to add a 7.2 kW heat pump water heater and asks how it affects the load analysis. What should the analyst do first?

  1. Estimate its daily run hours and add the resulting kWh to the annual load projection Correct answer.
  2. Exclude it because water heating is not an electrical load
  3. Subtract its wattage from the existing annual consumption
  4. Assume it runs 24 hours per day at full power

Explanation

A heat pump water heater runs intermittently, so its energy contribution depends on daily operating hours, not continuous full power. Adding that estimate keeps the projection realistic.

Question 16Conducting a site analysis, including load analysis

Why does a site analyst compare a building's measured peak demand against the rating of the existing service panel?

  1. To determine the optimal module tilt angle
  2. To calculate the array's annual energy production
  3. To estimate the local utility's transmission losses
  4. To confirm the service can accommodate existing and proposed electrical additions Correct answer.

Explanation

Peak demand relative to service rating shows available capacity headroom for new loads or interconnection. Array production, tilt, and utility losses are separate calculations.

Question 17Conducting a site analysis, including load analysis

A load analysis shows that a facility's peak demand occurs in the evening, while the PV array generates only during the day. What is the primary implication?

  1. The array will produce no energy at all
  2. The facility will never receive credit for exported energy
  3. A large share of production will be exported rather than used on site Correct answer.
  4. The evening peak will be eliminated by the array

Explanation

When generation and peak load are separated in time, much of the production flows to the grid instead of serving load directly. Export compensation depends on utility rules, and the array still produces energy, but the evening peak remains.

Question 18Conducting a site analysis, including load analysis

Which building type typically shows the lowest load factor, meaning its peak demand is large relative to its average demand?

  1. A continuously operating data center
  2. A facility with short, intense operating shifts Correct answer.
  3. A hospital with steady 24-hour occupancy
  4. A refrigerated warehouse running around the clock

Explanation

Load factor is average demand divided by peak demand, so facilities with brief high-intensity operation have low load factors. Continuous operations such as data centers, cold storage, and hospitals keep average demand close to peak.

Question 19Conducting a site analysis, including load analysis

A site analyst needs to size a battery to shift daytime PV production into the evening peak. Which load analysis output is most directly required?

  1. The utility's transmission voltage class
  2. The number of occupants in the building
  3. The roof pitch of the proposed array
  4. The evening energy consumption in kWh during the target period Correct answer.

Explanation

Sizing storage for load shifting requires the energy quantity that must be served during the target evening window. Occupancy, roof pitch, and transmission voltage do not determine the stored energy needed.

Question 20Conducting a site analysis, including load analysis

A commercial customer's load analysis includes a power factor of 0.82. Why does this matter for the site assessment?

  1. Power factor has no effect on any billed quantity
  2. Power factor only affects the color temperature of lighting
  3. Power factor determines the number of modules in a string
  4. Low power factor raises apparent demand in kVA and may incur utility penalties Correct answer.

Explanation

Apparent power in kVA is real power divided by power factor, so a low power factor increases kVA demand and can trigger utility charges. It does not govern module string sizing or lighting characteristics.

Question 21Conducting a site analysis, including load analysis

An analyst is comparing two years of utility bills and notices consumption rose 35 percent while occupancy stayed constant. Which explanation deserves investigation first?

  1. The utility changed the meter reading schedule
  2. A new large appliance or equipment fault has been added to the site Correct answer.
  3. The building's square footage increased
  4. The sun hours at the site increased

Explanation

A large consumption increase with stable occupancy usually points to a new load or a failing appliance such as a water heater or HVAC unit. Meter schedule changes, floor area, and solar resource do not explain a consumption jump of that size.

Question 22Conducting a site analysis, including load analysis

A site has a monthly peak demand of 60 kW, and the utility bills demand at $14 per kW. Adding a PV system reduces the measured peak interval by 15 kW in the billing month. What demand charge saving results for that month?

  1. $105
  2. $1,400
  3. $210 Correct answer.
  4. $840

Explanation

The saving equals 15 kW times $14 per kW, which is $210 for that month. Multiplying the full 60 kW by the rate gives $840, which ignores the reduction.

Question 23Conducting a site analysis, including load analysis

A load analysis must account for an inductive motor load that draws 20 kW at a power factor of 0.8. What apparent power should be used when evaluating the service capacity in kVA?

  1. 16 kVA
  2. 20 kVA
  3. 25 kVA Correct answer.
  4. 32 kVA

Explanation

Apparent power equals real power divided by power factor, so 20 kW / 0.8 = 25 kVA. Service capacity must be evaluated in kVA because that reflects the current the equipment actually draws.

Question 24Conducting a site analysis, including load analysis

A facility's load profile shows a broad midday plateau near the array's expected output, but the customer wants to minimize exported energy without storage. Which design consideration best serves that goal?

  1. Choosing module tilt to maximize winter output only
  2. Maximizing array size to export as much as possible
  3. Sizing the array to the annual energy total regardless of load timing
  4. Matching array capacity to the midday load plateau rather than to annual consumption Correct answer.

Explanation

When the goal is minimal export, sizing generation to the coincident load plateau keeps production consumed on site. Sizing to annual energy or maximizing export contradicts the stated objective, and winter-only tilt optimization does not address export.

Question 25Conducting a site analysis, including load analysis

A site analyst is evaluating whether a 200 A, 240 V single-phase service has headroom for a new 9.6 kW continuous load. What is the most defensible analytical step?

  1. Compare the new load only against the measured base load at night
  2. Assume the service is adequate because the panel has spare breaker spaces
  3. Compare the computed service load plus the new load against the service rating with the required safety factor Correct answer.
  4. Rely on the homeowner's statement that the panel never trips

Explanation

A defensible evaluation compares the calculated total load, including the continuous load with its safety factor, against the service rating. Spare breaker spaces, nighttime base load, and anecdotal reports are not capacity calculations.

Question 26Conducting a site analysis, including load analysis

A site analyst is preparing a load analysis for a residence where the utility provides only monthly billing data with no interval or daily detail. Which limitation should the analyst expect from this data set?

  1. It cannot be used to estimate the customer's average monthly bill.
  2. It cannot be compared with the customer's past billing history.
  3. It cannot reveal when within the month the consumption occurred. Correct answer.
  4. It cannot be used to calculate an annual consumption total.

Explanation

Monthly billing data gives only a total energy quantity per month, so the analyst cannot see daily or hourly timing. Load shape, peak timing, and coincidence with PV production all require finer resolution data such as interval records or a monitored load study.

Question 27Conducting a site analysis, including load analysis

During a site visit, an analyst records the utility meter's service voltage, main breaker rating, and panel busbar rating. Why is this information part of the load analysis rather than only the electrical design?

  1. It predicts the annual energy consumption of the building.
  2. It determines the utility's retail rate schedule for the customer.
  3. It sets the array's expected capacity factor for the location.
  4. It establishes the maximum load the existing service can carry before an upgrade is required. Correct answer.

Explanation

Service voltage, main breaker, and busbar ratings define the capacity envelope of the existing electrical service. The load analysis compares measured or calculated demand against that envelope to see whether added load or PV interconnection fits without an upgrade.

Question 28Conducting a site analysis, including load analysis

An analyst is told a small office has a connected load of 55 kW, but the utility's interval data show a maximum demand of 18 kW. Which explanation best accounts for this gap?

  1. The building must have a power factor well above unity.
  2. The connected load figure must exclude all lighting circuits.
  3. The utility meter is under-recording demand by a large margin.
  4. Not all connected equipment operates at the same time or at rated load. Correct answer.

Explanation

Connected load is the sum of nameplate ratings of all installed equipment, while demand reflects what actually runs simultaneously and at real operating load. Diversity and load factors explain why measured peak demand is normally well below connected load.

Question 29Conducting a site analysis, including load analysis

A load analysis for a warehouse shows a nearly flat 24-hour profile at about 40 kW, while the proposed PV array peaks near midday. What does this profile imply about the PV energy that will be consumed on site?

  1. Generation will be unusable because the load is too steady.
  2. Generation must be curtailed whenever the load is flat.
  3. Most generation will be exported because the load disappears at midday.
  4. Most generation will be used on site because the load is present throughout the day. Correct answer.

Explanation

A flat profile means the facility draws power at all hours, including the midday hours when PV produces. High coincidence between generation and load raises the self-consumption fraction and reduces export.

Question 30Conducting a site analysis, including load analysis

An analyst must estimate the annual energy use of a building that has no utility history because it is newly constructed. Which approach is most defensible for the load analysis?

  1. Assume the annual consumption equals that of the nearest building regardless of use.
  2. Skip the load estimate until twelve months of bills are available.
  3. Build an end-use estimate from equipment inventories, schedules, and occupancy assumptions. Correct answer.
  4. Use the connected load total as the annual energy consumption in kWh.

Explanation

For new construction, an end-use estimate combines equipment wattages, hours of operation, and occupancy patterns to approximate annual energy. Documenting assumptions lets the analyst refine the estimate later with measured data.

Question 31Conducting a site analysis, including load analysis

A restaurant's interval data show a base load near 8 kW overnight and peaks near 45 kW at mealtimes. The owner wants to know whether a battery could reduce demand charges. What does the load analysis need to establish first?

  1. The PV array's expected annual production.
  2. The magnitude and duration of the demand peaks that the battery would need to shave. Correct answer.
  3. The total annual kWh consumed by the restaurant.
  4. The utility's residential rate schedule.

Explanation

Demand-charge reduction depends on how high the peaks are and how long they last, because the battery must supply that power for that duration. Annual energy and PV production do not by themselves size a demand-shaving battery.

Question 32Conducting a site analysis, including load analysis

An analyst reviews a year of interval data and finds the highest demand of the year occurred during a two-day heat wave in July. How should this affect a demand-charge savings estimate for a battery?

  1. The estimate should use the annual average demand instead of the peak.
  2. The estimate should assume the peak recurs every month equally.
  3. The estimate should account for the fact that only a few hours drive much of the annual demand cost. Correct answer.
  4. The estimate can ignore July because it is a single event.

Explanation

When a small number of extreme intervals set the billed demand, the value of shaving those specific intervals is high and the analysis should focus on them. Averaging or ignoring the peak misrepresents the demand-charge opportunity.

Question 33Conducting a site analysis, including load analysis

A commercial customer's interval data show apparent power demand of 75 kVA and a power factor of 0.80. The analyst is evaluating inverter sizing and conductor loading. What real power and reactive power should the analyst use?

  1. 60 kW real and 75 kvar reactive
  2. 75 kW real and 60 kvar reactive
  3. 60 kW real and 45 kvar reactive Correct answer.
  4. 94 kW real and 45 kvar reactive

Explanation

Real power equals kVA times power factor, so 75 kVA times 0.80 gives 60 kW. Reactive power is the square root of kVA squared minus kW squared, which is 45 kvar, consistent with the load drawing significant reactive current.

Question 34Conducting a site analysis, including load analysis

An analyst is comparing a proposed PV system against a facility whose load analysis shows a load factor of 0.35. The customer asks what this value means for the site assessment.

  1. The facility uses 35 percent of its annual consumption at night.
  2. The facility's power factor is 0.35, indicating poor power quality.
  3. Average demand is only 35 percent of peak demand, so peaks are sharp relative to typical operation. Correct answer.
  4. The facility operates at full load only 35 percent of the year.

Explanation

Load factor is average demand divided by peak demand over the same period. A value of 0.35 means the average is well below the peak, so demand is concentrated in relatively short high-load periods.

Question 35Identifying SH safety practices, standards, codes and certification

Under NFPA 70E, before any work on solar photovoltaic conductors can begin, what must the worker complete to justify working while energized?

  1. A verbal approval from a co-worker on site
  2. A utility interconnection study
  3. A purchase order for replacement modules
  4. An energized electrical work permit approved by an authorized person Correct answer.

Explanation

NFPA 70E requires that work on or near exposed energized electrical conductors be justified as infeasible in a de-energized state, and that justification be documented on an energized electrical work permit signed by an authorized individual. The permit records the hazard analysis, shock and arc-flash boundaries, and required PPE. A casual verbal approval or procurement document does not satisfy this requirement.

Question 36Identifying SH safety practices, standards, codes and certification

Which standard is the primary OSHA reference for electrical protective equipment such as insulating gloves and sleeves used during PV installation?

  1. 29 CFR 1910.134
  2. 29 CFR 1910.147
  3. 29 CFR 1926.501
  4. 29 CFR 1910.137 Correct answer.

Explanation

29 CFR 1910.137 specifies design, in-service care, and testing requirements for electrical protective equipment, including rubber insulating gloves and sleeves. It establishes the periodic retest intervals and voltage class ratings that a PV installer must follow. The other citations address lockout/tagout, fall protection, and respiratory protection respectively.

Question 37Identifying SH safety practices, standards, codes and certification

A PV installer will perform DC measurements on a string operating at 600 V. Which glove class is the minimum rated for this voltage per ASTM D120?

  1. Class 4
  2. Class 00
  3. Class 0
  4. Class 2 Correct answer.

Explanation

ASTM D120 Class 2 gloves are rated for use up to 17,000 V AC and are the appropriate class for 600 V DC work when combined with proper leather protectors. Class 00 and Class 0 are limited to 500 V and 1,000 V AC respectively, which is insufficient margin for the described system voltage. Class 4 is rated for much higher voltages and is not the minimum.

Question 38Identifying SH safety practices, standards, codes and certification

Which article of NFPA 70 (NEC) specifically addresses installation requirements for solar photovoltaic systems?

  1. Article 250
  2. Article 690 Correct answer.
  3. Article 705
  4. Article 480

Explanation

NEC Article 690 contains the specific requirements for PV systems, covering circuit sizing, disconnects, rapid shutdown, and grounding. Article 250 covers general grounding and bonding, Article 705 addresses interconnected electric power production sources, and Article 480 covers storage batteries. Knowing which article applies helps an installer locate the correct requirement quickly.

Question 39Identifying SH safety practices, standards, codes and certification

Which NEC section establishes the rapid shutdown requirements for PV systems on buildings?

  1. 690.8
  2. 690.31
  3. 690.47
  4. 690.12 Correct answer.

Explanation

NEC 690.12 specifies rapid shutdown requirements, including the controlled conductors and the voltage limits that must be achieved within a specified time after shutdown initiation. It is the section first responders rely on to ensure conductors near the array are de-energized. The other sections address wiring methods, grounding, and circuit sizing.

Question 40Identifying SH safety practices, standards, codes and certification

A PV array is installed on a commercial roof. During a rapid shutdown event, which conductors must be limited to no more than 30 V within 30 seconds under NEC 690.12?

  1. Only the equipment grounding conductors
  2. The controlled conductors within the array boundary and 1 foot from the array Correct answer.
  3. Only the AC output conductors at the inverter
  4. All conductors more than 1 foot from the array

Explanation

NEC 690.12 requires that controlled conductors within the array boundary and extending 1 foot from the array be reduced to 30 V or less within 30 seconds of rapid shutdown initiation. This protects firefighters working near the array. Conductors outside that zone and grounding conductors are not subject to this specific limit.

Question 41Identifying SH safety practices, standards, codes and certification

Which NFPA standard governs the installation of stationary energy storage systems, including lithium-ion batteries paired with PV?

  1. NFPA 72
  2. NFPA 70B
  3. NFPA 780
  4. NFPA 855 Correct answer.

Explanation

NFPA 855, the Standard for the Installation of Stationary Energy Storage Systems, sets requirements for spacing, fire suppression, ventilation, and signage for ESS installations. It is commonly applied alongside NEC Article 706 for battery storage. The other standards cover maintenance, fire alarm systems, and lightning protection.

Question 42Identifying SH safety practices, standards, codes and certification

A rooftop PV system is installed on a dwelling. Which NEC requirement most directly protects firefighters by marking the location of the DC conductors and disconnects?

  1. Motor disconnecting means in 430.102
  2. Placarding and labeling required by 690.56 and 705.10 Correct answer.
  3. Bonding requirements in 250.104
  4. Conductor ampacity derating in 310.15

Explanation

NEC 690.56 and 705.10 require permanent placards and labels identifying PV system disconnects and the presence of PV power sources so that first responders can locate them quickly. These markings are a critical safety feature for firefighting operations. The other sections address bonding, ampacity, and motor disconnects, which are unrelated to PV identification signage.

Question 43Identifying SH safety practices, standards, codes and certification

Which organization publishes the NEC, and how often is it revised?

  1. IEEE, every five years
  2. UL, annually
  3. NFPA, every three years Correct answer.
  4. NEMA, every two years

Explanation

The National Electrical Code is published by the National Fire Protection Association and is revised on a three-year cycle. Installers must verify which edition their local jurisdiction has adopted because adoption lags vary widely. The other organizations publish different standards or on different schedules.

Question 44Identifying SH safety practices, standards, codes and certification

What does the NABCEP PV Associate credential primarily demonstrate?

  1. Authorization to design utility-scale interconnection facilities
  2. Master installer certification for all PV system types
  3. Foundational knowledge of PV systems, safety, and the NEC Correct answer.
  4. A journeyman electrician license issued by a state board

Explanation

The NABCEP PV Associate credential verifies foundational knowledge of photovoltaic systems, including safety practices, electrical basics, and code awareness. It is an entry-level credential and does not replace a state electrician license or authorize utility interconnection design. Advanced NABCEP certifications such as PV Installation Professional cover design and installation competency.

Question 45Identifying SH safety practices, standards, codes and certification

Which practice is required before servicing the DC side of a PV system to control hazardous energy under OSHA 1910.147?

  1. Notifying the utility after work begins
  2. Wearing only safety glasses
  3. Removing all module grounding conductors
  4. Applying lockout/tagout and verifying absence of voltage Correct answer.

Explanation

OSHA 1910.147 requires a documented lockout/tagout procedure with energy isolation, lock application, and verification of de-energized state before servicing. For PV, this includes isolating DC circuits and confirming zero voltage at the point of work. Notifying the utility after work begins or removing grounding conductors would increase rather than control the hazard.

Question 46Identifying SH safety practices, standards, codes and certification

Which PPE item is specifically required when working near exposed energized DC conductors to protect against arc-flash thermal exposure?

  1. Arc-rated clothing and face protection selected per an incident energy analysis Correct answer.
  2. Disposable dust mask
  3. Cotton work shirt and leather work boots only
  4. Hearing protection only

Explanation

NFPA 70E requires arc-rated clothing and face or head protection matched to the incident energy calculated for the task and equipment. DC arc flash can be significant in large PV arrays, so the analysis must cover DC circuits as well as AC. Ordinary cotton clothing and unrelated PPE do not provide arc-flash protection.

Question 47Identifying SH safety practices, standards, codes and certification

A crew is installing a PV array on a steep residential roof. Which OSHA subpart primarily governs the fall protection measures required?

  1. Subpart S, 1910.333
  2. Subpart M, 1926.501 Correct answer.
  3. Subpart E, 1910.132
  4. Subpart Z, 1910.1000

Explanation

OSHA 29 CFR 1926 Subpart M, specifically 1926.501, establishes fall protection requirements for construction work, including residential roofing at the trigger height. PV installers on roofs must use guardrails, personal fall arrest, or other approved systems. The other subparts address electrical work practices, PPE general requirements, and air contaminants.

Question 48Identifying SH safety practices, standards, codes and certification

When using a digital multimeter to verify a de-energized PV string, which step should be performed first to confirm meter function?

  1. Test the meter on a known live source or verify with a proving unit Correct answer.
  2. Disconnect the meter leads from the probes
  3. Set the meter to the highest resistance range
  4. Replace the meter battery regardless of condition

Explanation

Before relying on a meter to confirm absence of voltage, the worker must verify the meter is functioning by testing it on a known source or proving unit. This is a recognized safe work practice under NFPA 70E and prevents false-negative readings caused by a failed meter or blown fuse. Resistance ranges and unnecessary battery replacement do not confirm meter function.

Question 49Identifying SH safety practices, standards, codes and certification

Which condition makes a PV module particularly hazardous to handle even when the system disconnect is open?

  1. The module produces voltage whenever exposed to light Correct answer.
  2. The module only becomes live after inverter startup
  3. The module stores charge in an internal capacitor
  4. The module is isolated by the rapid shutdown device

Explanation

A PV module generates voltage whenever it is illuminated, so opening a disconnect does not de-energize the module terminals or the string conductors between modules. Workers must cover modules or work during low light and treat conductors as energized. Modules do not rely on inverter startup for voltage, and rapid shutdown does not de-energize the module itself.

Question 50Identifying SH safety practices, standards, codes and certification

Which NEC article addresses grounding and bonding requirements that apply to PV system equipment?

  1. Article 250 Correct answer.
  2. Article 680
  3. Article 310
  4. Article 404

Explanation

NEC Article 250 establishes the general grounding and bonding requirements, which PV systems must satisfy in addition to Article 690 provisions. Proper grounding and bonding limit voltage during faults and provide a low-impedance path for fault current. Articles 310, 404, and 680 cover conductors, switches, and pools respectively.