Installation (18.3%)

PVA · 55 questions

• A crew must add 40 kW on a two-story office with a flat membrane roof that forbids penetrations, keeps a 10-year warranty, and needs wind-rated hold-down. The owner wants no grading or foundations. Which mounting type matches this flat-roof constraint?
• A two-person crew is pulling PV source conductors into EMT on a hot commercial roof with several 90-degree bends, plus a short flexible whip into an inverter with vibration. The foreman wants neat, code-typical protection at entries and joints. Which fitting selection best meets strain relief and bushing needs for this run?
• A crew is building a ground-mount rack on a sloped, rocky lot. The six posts are already set in concrete, and the rails must sit in one level plane before the modules go on. Which tool set lets them fasten the pressure-treated ledgers and true up the rail plane in one pass?
• On a residential re-roof, half-inch plywood sheathing is nailed over 2x8 SPF rafters spaced 16 inches apart. The mount plan requires 1-1/2 inches of bite into each rafter, a 3/8-inch shank, stainless hardware to match the aluminum rail assembly, and a pilot hole to prevent splitting. Which fastener should the installer drive at each mount to satisfy all four requirements?
• You arrive to commission a 10-kW home system with a new inverter, monitoring gateway, AC disconnect, and labeled rapid shutdown switch. The array tests clear and the roof work is done. Which commissioning sequence verifies inverter operation, communications, and disconnects before handoff?
• A garage retrofit adds a wall-mounted lithium battery, a hybrid inverter, and a critical-loads panel fed during outages. The crew has arc-flash, disconnect, and NEC-required placards ready. Which storage labeling and marking approach completes the install for first responders?
• A coastal installer is labeling a rooftop DC disconnect and inverter area exposed to sun, rain, and salt spray, and the AHJ will re-inspect in five years. The crew wants labels that stay legible for the system life. Which labeling approach best meets durability for PV markings?
• A 12-kW system passed local inspection yesterday and the monitoring portal shows steady production, but the owner asks to flip the main solar breaker on today. Interconnection approval is still pending with the utility. Which commissioning document and permission-to-operate step allows legal energizing?
• A crew is installing a listed rail system that uses piercing clips under modules to bond frames to rails, with one lug tying the rail to the EGC. Wind, dust, and rushed torque guns threaten the connection. Which installation practice correctly applies listed bonding components for integrated grounding of this array?
• An installer is mounting an AC disconnect for a residential array. The manual lists the enclosure as NEMA 1 and gives a torque value for each terminal, but the crew plans to hang it on the exterior wall beside the meter where rain runs down the siding. An indoor spot in the attached garage stays within reach of the equipment. Which mounting and tightening decision meets both requirements?
• A ground-mount crew has stamped site plans calling for 8-foot post spacing, shared rails, and a torque table, but the foreman suggests wider spacing to save piles on rocky soil. The permit set is already approved. Which action follows manuals and site-engineered plans correctly?
• Commissioning a 60-kW rooftop array, you find string tags at the combiner box that do not match the tags on the module rows, and no crew member can confirm which set is right. The as-built drawing predates two late field changes, and owner sign-off is tomorrow morning. Which verification step should you run first to reconcile the string labeling?
• You commission a 9-kW home system with battery backup and app monitoring for owners new to solar. They need daily use habits, what the portal means, and what to do in a fire or outage. Which owner orientation best covers operation, monitoring, and emergency response?
• Commissioning of a 16-kW ground-mount array on a clear morning shows five inverter inputs reading about 420 V, one input reading 0 V, and a thermal scan showing one combiner connector 35 °C hotter than its neighbours. The associate wants to clear both findings in a single pass. Which measurement should come first to locate the dead string?
• An installer is mounting a wall inverter with an adjacent AC disconnect in a commercial electrical room where boxes and mops are stored against the gear and the door swings toward the worker. Which working-clearance practice best preserves safe access to this electrical equipment?
• A 12 kW array is planned for the roof of a community center covered three years ago with a 60-mil TPO membrane at 2/12 pitch. The remaining single-ply warranty requires that every penetration be made and sealed by a factory-authorized applicator, and the structural review finds insufficient capacity for a ballasted system. Which mounting attachment plan keeps the roof warranty in force once the array runs?
• You are wiring a 12-kW rooftop string inverter job in Tampa with long conduit runs along a parapet and up to modules. The plan notes wind movement, rain pooling, and sharp enclosure knockouts. Which wiring method best follows best practice for drip loops, bend radius, support, and protection from damage?
• Your crew is setting aluminum rails on a shingle roof for a 9-kW home, driving lags into rafters, and torquing rail bolts to spec. The kit lists an impact driver, socket set, torque wrench, and chalk line, plus a grinder with a cutoff wheel. Which tool selection fits this mounting-structure task correctly?
• An installer is running EMT along a hot attic into a rooftop junction box and must transition to a short flexible whip to the inverter while keeping conductors protected where they enter enclosures. Which fitting choice best completes this electrical equipment installation?
• You plan three small builds: a sealed membrane flat roof that cannot be pierced, a shingle pitched roof with attic rafters, and an open field with expansive clay. Which mounting type match best fits flat roof, pitched roof, and ground mount needs?
• You are landing aluminum feeders in a 200-A rooftop AC disconnect that lists a torque value, a wire range, and a NEMA 3R enclosure mark. The site sees wind-driven rain and the inspector will check lugs and cover seating. Which termination and enclosure practice meets manufacturer and rating needs?
• At final checkout of a 15-kW residential hybrid system with battery, the homeowner reports the app shows no data and the system stayed on during a required rapid-shutdown test. Which verification of inverter operation, communications, and disconnects should the associate perform?
• On a 12-kW rooftop retrofit the crew must land stranded aluminum feeder conductors in a combiner with lugs marked CU-ONLY, the site is coastal and damp, and the foreman wants a durable low-resistance joint. Which conductor and termination compatibility rule should the installer apply to make this connection safe?
• You are laying out flush-mount rails on a comp-shingle home with 24-in. on-center trusses, per the rail maker table that limits support spacing and rail overhang past the last mount. You find truss lines with a stud finder and attic check, then mark two rail lines. Which layout check should you verify to confirm span and cantilever compliance?
• A 30-kW rooftop system for a hardware store passed the AHJ inspection on Tuesday, and the owner wants it running for a Friday event. The utility's interconnection review is still open, the revenue meter swap is booked for next week, and the monitoring portal account still needs registering. Which action satisfies the permission-to-operate requirement today?
• An installer is labeling a rooftop DC disconnect, an outdoor inverter, and an AC panel fed by a new 6 kW system in a sunny, rainy climate. The labels must remain legible for the life of the system. Which labeling practice meets marking durability requirements?
• You are mounting aluminum rails to pressure-treated wood blocking on a coastal home with stainless rail hardware and a galvanized flashing kit, within sight of salt spray. Which fastener choice should you specify to meet strength, size, and metal compatibility?
• A two-person crew is setting rail-based flush mount on tile hooks where the site plan lists specific spans, lag size, and torque values tied to the engineering stamp. The lead wants to speed up by widening spans and guessing torque. Which mounting practice follows manufacturer manuals and site-engineered plans?
• You are placing a wall-mounted inverter and AC disconnect in a 10-kW garage installation where the owner wants storage shelves beside the gear and the concrete wall allows flexible layout with no windows or sinks nearby. Which placement maintains proper working clearances for electrical equipment installation?
• An off-grid cabin owner must choose batteries for a small solar shed that is unheated in winter, visited monthly, and needs low upkeep with safe indoor placement. Which lithium versus lead-acid comparison should guide this energy storage choice?
• After a 10-kW battery-ready install, the owners are unsure how to read the app, when to call service, and how to shut down safely in a storm or fire. The lead has 20 minutes for handoff. Which owner orientation on operation, monitoring and emergency response fits best?
• On a rail-mounted home array, the plan calls the aluminum rails the equipment grounding path using WEEB-style clips between modules and rails plus a single lug to the grounding conductor. Which check should the installer perform to apply integrated grounding and listed bonding components?
• You are wiring a 13-kW rooftop-to-attic run where metal conduit passes through a sharp panel enclosure knockout, joins to a second conduit length outdoors, and enters a junction box that needs a watertight cable pass for the monitoring line in a rainy climate. Which choice of fittings with connectors, couplings, bushings, and strain reliefs best protects the conductors?
• A two-person crew installs a wall-mounted lithium battery with a hybrid inverter in a garage, the manual requires a specific startup order, torque values, and closed-loop communication settings, and the lead wants to finish before the inspection window closes. Which practice for following manufacturer programming and safety instructions best ensures a safe startup?
• You are wiring a 12-kW home roof array where DC homeruns drop down an exterior wall to a garage inverter, exposed to sun, rain, and lawn tools. The foreman wants neat work that will pass inspection and last. Which wiring best practice for drip loops, bend radius, support, and damage protection should the installer use?
• A designer sizes a 12-kW array for a house with a 10:12 clay tile roof, but the homeowner will not allow any penetrations through the 26-year-old tile. There is no attic access for rafter layout, the driveway is too narrow for a carport, and a level side yard large enough for the array sits unshaded beside the meter. Which mounting structure type matches these site facts best?
• A crew plans a 36-module array on a 10-year-old standing-seam metal shop roof pitched at 4/12. The panel maker's 30-year warranty is voided by any pierced fastener and no solar waiver exists, the panels carry a limited point-load rating between purlins, the roofer's spec caps ballasted roof mounts at 2/12, and the site has no yard space. Which mounting system satisfies the warranty, load, slope, and site limits?
• A crew adds a second battery cabinet to a basement system with PV disconnects, a battery disconnect, and an exterior rapid-shutdown switch, the inspector flagged missing directional cues last time, and the owner needs clear emergency actions. Which storage labeling and marking approach best meets field expectations?
• A crew is finishing a garage string inverter and rooftop disconnect on a coastal home with sun, rain, and salt spray. The foreman rejects handwritten tape flags and plain indoor stickers for field labels. The owner wants labels legible for years. Which labeling and marking approach meets durability requirements for PV field equipment?
• A designer lays out rails on a home with 24-inch truss spacing, 5/8-inch plywood deck, and a hip roof needing rails across three supports with short overhang. Which structural locating and span judgment should the installer use to set safe attachments?
• An install lead is setting aluminum rail on shingle mounts for a 7-kW crew build with L-feet, lag screws, and torque-marked rail bolts, working on a hot roof with limited time. The foreman wants fast but spec-ready rails. Which common power and hand tool practice should the crew use for the mounting structures?
• You terminate #10 copper PV wire into an inverter lug marked AL7CU, 75C, with torque specs, in a hot garage where a prior job mixed metals and overheated. The apprentice asks if any lug and wire will do. Which conductor and termination compatibility check should the installer make for safe current flow?
• A grocery store pairs its rooftop PV with storage to shave demand peaks. The bank will cycle daily to about 40% depth of discharge, sit in a battery room reaching 40 °C in summer, and get service only once a quarter, with a ten-year life target. Which battery type best fits that duty cycle?
• An installer on a permitted home array finds the racking manual torque differs from the site-engineered plan stamp, with mismatched clamp part numbers and a revised rail spacing note. Which practice correctly follows manufacturer manuals and site-engineered plans before proceeding?
• A crew just finished a 6-kW home roof install with two strings, rail mounts, and a string inverter in the garage. The foreman wants a final QA walk before startup to catch loose hardware, wire damage, and labeling gaps. Which visual inspection and QA/QC checklist control should the crew complete to confirm install quality?
• A trainee is landing aluminum service conductors in a new outdoor inverter cabinet rated for wet locations, with a torque table inside the door. The foreman stresses loose lugs cause heat and water entry voids the rating. Which termination practice should the trainee apply to meet manufacturer torque and NEMA enclosure requirements?
• You are routing DC conductors down an exterior stucco wall to an inverter on a home with afternoon sun and weed trimmers nearby. The run sags between clips and enters the box from the top without slack. Which wiring best practice should the crew apply to protect this exposed run?
• A crew mounts aluminum rails on a home 500 feet from salt water using stainless L-feet and lag screws into rafters with flashing. Morning dew keeps joints damp for hours and past jobs show white crust and pitting where bare steel touched aluminum. Which fastener practice best ensures strength and metal compatibility?
• An installer is asked to mount flush rails on a 6-year-old architectural shingle roof at 4:12 pitch with one soft spot near a valley, and the owner provides a 25-year shingle warranty that bars non-approved sealants and grinding. The attic shows 24-inch truss spacing. Which mounting assessment best respects roof type, pitch and warranty impact?
• An installer is placing a wall-mounted inverter and AC disconnect in a cramped garage with boxes stacked in front, a workbench beside the panel, and low headroom. The inspector cites access and escape space. Which working clearance practice should the crew apply for electrical equipment installation?
• You commission a 10-kWh wall battery paired with a hybrid inverter in a garage with limited ventilation, where the manual specifies torque, firmware, charge limits, and PPE for arc and chemical hazards. Inspection requires listed settings and labeled disconnects. Which commissioning approach follows manufacturer programming and safety instructions?
• A helper staged aluminum USE-2 for a rooftop DC run, copper-only lugs in a combiner, and no anti-oxidant or torque tools for a hot coastal site. Which judgment about conductor and termination compatibility should the lead enforce before landing wires?
• During commissioning of a 10-kW roof with three strings, the inverter shows low power and one MPPT reads near zero volts in full sun. The lead suspects a dead string, crossed leads, or a hot joint in the combiner. Which commissioning test of string voltage, polarity and thermography best isolates the fault?
• A crew installs a listed rail system with integrated grounding clips that pierce anodizing to bond modules to rails, plus a copper lug for the equipment ground wire. The inspector wants continuous fault path with no field improvising. Which grounding method best uses listed bonding components?
• A crew must set flush-mount rails on a home with 24-inch on-center trusses, 7/16-inch OSB decking, and a layout needing a 6-foot rail span with 2-foot end overhang past the last mount. The lead suspects a weak bay and wide cantilever. Which structural check best judges span and cantilever for rafters, trusses and decking?