Safety (20%)

PVA · 60 questions

• An apprentice must verify 480-V AC disconnect voltage and 600-V DC string voltage on a bright rooftop with a digital multimeter rated for the task. Gloves, glasses, and a buddy are on site. Which safe use of electrical test equipment proves absence of voltage?
• A crew is augering footings for a small ground-mount at a former fuel depot now used as a park. The environmental report flags this corner for possible petroleum-impacted soil, the contract requires notifying the site contact before a flagged area is disturbed, and a storm drain inlet sits ten feet downhill of the hole. The auger brings up dark, oily soil that smells of fuel. Which excavation control should the crew apply before more soil is removed from that hole?
• A solar firm is writing its site safety plan for a steep-slope residential install with ladder access, attic work, and panel handling near a 240V service. The manager must cite the right authorities for falls, ladders, and electrical hazards. Which safety-plan statement best identifies the applicable safety regulations?
• A three-person crew is installing a 40-module array on a flat warehouse roof whose bare edges drop 6 m on all sides. Their route from the hoist to the array crosses three unguarded skylights, and the building's maintenance staff walk that route weekly without harness training. Which fall protection arrangement should be installed for this roof?
• An apprentice must cut strut and drill a weatherproof box on a windy rooftop where metal shavings fly, cords cross the walk path, and the panel edges are sharp while wearing gloves and glasses. Which hand and power tool safety practice best controls these cutting hazards?
• A two-person crew must clean dust from ground-mount modules reached by kneeling on a damp hillside near a pond, with slip and shock risks from hoses and cords. The foreman can reroute work to dry level carts. Which control choice applies the hierarchy of controls to this solar hazard?
• A two-person crew will cut aluminum rails with a chop saw on a sunny rooftop, drill into concrete for anchors, and then torque energized DC connectors in a combiner. Dust, noise, glare, cuts, and arc flash are all present. Which PPE selection best fits the combined eye, hand, ear, and arc hazards of this task?
• A service call finds a scorched combiner with melted insulation, a lingering burnt smell, and midday sun keeping the roof array live with no effective rapid-shutdown reset. The owner wants power back fast. Which assessment captures the risk of working on energized or faulty equipment including rapid shutdown?
• A PV service technician opens the van before a rooftop inspection and finds three issues: a fiberglass extension ladder with a deep gouge exposing fibers in one side rail, a fall-arrest lanyard with no legible inspection tag even though the employer's procedure requires one, and a GFCI extension cord whose strain relief is cracked near the plug. The customer is waiting and usable spares are already on the truck. Which pre-use inspection decision does this equipment condition require before work begins?
• A three-person crew starts a 25-module retrofit on a two-story shingle home with a skylight hole, ridge work near the eave edge, and morning dew on dark shingles. The lead holds a pre-job hazard talk. Which fall-hazard recognition guides the morning setup?
• You must lift six modules and rails to a second-story roof over a narrow side yard with a fence, kids next door, and gusty wind. Crew have ropes, a gin pole, and tool lanyards. Which hoisting, rigging, and tool-tethering method keeps the lift controlled and the ground clear?
• A three-person crew stages 24 modules, two rail bundles, and a case of lag screws for a 9.6 kW array on a shingled roof with rafters at 16 inches on center; the deck between rafters carries only light loads, and the ladder-to-array walk path must stay clear. Which staging layout best protects the roof and the crew?
• A two-person crew will clean terminals and torque connections on a vented lead-acid battery bank in a small energy closet with a sink nearby. Acid residue and arc risk are present. Which battery safety practice should the lead enforce first to follow insulated tools, face and eye protection, eyewash, and gloves?
• A two-person crew must move a 1,200-lb pallet of modules and an inverter across a sloped gravel lot to a commercial roof staging area using a rented forklift and a box truck with a liftgate. Which transport and heavy-equipment practice best protects people and gear during this move?
• You are lead for a one-day ground-mount install on an open lot next to a school walkway in Austin. Curious pedestrians cut through, and small tools sit near the trench. The safety plan calls for access control. Which control best meets the fencing or screening requirement to control site access?
• A technician must climb from a level concrete yard through a roof hatch onto a flat roof 3.2 m above to reset a string combiner. An exposed 208 V meter base sits 300 mm beside the hatch opening. On site are a 4.5 m fibreglass ladder, a 3.5 m fibreglass ladder and a 4.5 m aluminium ladder. Which ladder setup gives him safe access through the hatch?
• At a school parking-lot carport, a pallet of glass modules sits 40 feet from the array on level asphalt. Each module weighs 51 pounds, and the site lift plan requires two people to handle any item over 40 pounds. The finished rail sits 7 feet 6 inches above the pavement, so installers need an appropriately rated scissor lift to work at rail height rather than set the module from the ground. Crew leads also require installers to pivot with their feet instead of twisting at the waist. Which handling method meets all three requirements for setting these modules?
• A two-person crew arrives for a summer flat-roof service call at 95F with dark membrane, no shade, and wasps around the parapet conduit. One tech feels dizzy and the forecast shows afternoon lightning. Which hazard response best controls heat, weather, and animal risks?
• A crew is drilling 3/8-inch holes into a concrete foundation wall to hang rail brackets, and the site silica plan requires a vacuum shroud on any concrete drilling while site rules call for eye and hearing protection on rotary hammer work. The drill chart calls for hammer-rotation on concrete and rotation-only on wood and metal. Which drill setup covers every requirement for these foundation holes?
• A two-person crew services inverters on a low-slope warehouse roof, working about fifteen feet in from every edge. Six unprotected skylights sit inside the work area, the parapet is forty-two inches high, and the nearest engineered anchor is forty feet away along the north edge. Which fall protection system addresses the real exposure in this fifteen-foot work zone?
• An O&M technician opens an outdoor battery cabinet and finds a shallow puddle of electrolyte under one battery in a flooded deep-cycle bank. The concrete pad drains to a planted swale, the SDS requires a face shield, chemical goggles and acid-resistant gloves, and it calls for neutralizing the electrolyte with an alkaline absorbent before disposal. Which hazardous-materials response should the technician use for this electrolyte spill?
• Your crew must set ballasted racks on a dusty flat roof in summer heat where就不 saw-cutting concrete generates silica dust and workers face falls near the edge. Which control choice best applies the hierarchy of controls to this solar job-site hazard?
• Your crew installs modules on a distribution-center roof using a 60-foot horizontal lifeline with only a ladder and roof hatch for access, and EMS averages 20 minutes to reach this industrial park. The safety plan already lists first-aid kits, spill cleanup, responder access, and incident notification. Which emergency-response element is still missing for the fall hazard this crew faces?
• A foreman plans a two-story shingle-roof install requiring ladder access, fall protection, and work inside a live main panel to land a backfed breaker for a 10-kW system. Which identification of applicable safety regulations best guides this safety plan?
• Your crew arrives for a two-story shingle install with an uncovered skylight opening near the ridge and an unguarded eave leading edge where staging is planned. Morning huddle covers harnesses, covers, and rails. Which fall hazard control should the team identify first for leading edges and roof openings?
• Your crew will hand-dig an 18-in. deep AC trench across a side yard and auger four ground-mount piers near a driveway for a 6-kW array, and the homeowner mentions old fuel oil lines and soft fill soil. Which hazard control should the lead apply first to address digging hazards for trenching and footings?
• A two-person crew must lift three 45-lb modules and hand tools to a single-story roof edge with a public walkway below and gusts picking up. The lead wants controlled lifts and no dropped objects. Which hoisting, rigging and tool-tethering method best controls the lift?
• A crew arrives at a flat commercial roof to set two pallets of modules, a pallet of ballast blocks, and rails for a next-day install. The roof has marked walk paths, drains, and long spans between supports. Which staging plan best protects the roof with load distribution in mind?
• Your crew arrives for a 12-kW commercial rooftop job requiring extension ladders, fall protection harnesses, and a torque wrench, and the lead asks for a pre-use check before anyone climbs or lifts panels in breezy morning conditions. Which inspection of equipment before use best meets safe work practices?
• A 6-person crew starts a two-week commercial rooftop job with new hires, dusty panel cutting, and solvent cleaners on site, and the site lead must prove weekly safety compliance to the GC. Which safety-meeting and on-site document practice should the lead follow to satisfy the injury and illness program?
• A helper sets a 16-ft fiberglass extension ladder on compacted gravel to reach a 14-ft garage roof. The base sits 4 ft from the wall for a proper climbing angle, but the rails extend only about 1 ft above the roof edge. Which ladder setup makes stepping from the ladder onto the roof safe for the helper?
• Your two-person team must move palletized modules, a 90-kg inverter, and conduit across a muddy 15-kW farm site using a flatbed truck and hand cart where the path slopes gently and winds gust in the afternoon. Which method for transporting and moving heavy equipment and vehicles best protects people and gear?
• A two-person crew is sent to a rural ground-mount site on a January morning: minus 8 °C with a stiff wind, hoar frost on the steel rails they must climb that re-forms minutes after it is wiped, and a raccoon denning under the inverter pad they need to open. The supervisor has to brief the day's controls. Which control set covers the cold exposure, the frosted rails and the denning raccoon?
• A contractor is building a 40 kW ground-mount array on a vacant lot next to a school playground with foot traffic, curious teens, and evening trespass. The owner wants low upkeep and safe operation. Which site access control with fencing or screening best fits the safety plan?
• A technician opens a rooftop DC combiner at 2 p.m. to reset a tripped breaker. The string circuits run to a central inverter in fault mode with its AC disconnect open, while the utility still feeds the building. Which statement correctly describes the hazard at the combiner?
• You are assigned to drill rail lags in a hot attic, then help torque DC combiner terminations on a live 400-V rooftop disconnect nearby. The lead warns of dust, sharp flashing, loud tools, and arc-flash risk. Which PPE selection should you make for the task?
• A small contractor is writing a safety plan for a two-story home retrofit with roof work near a service drop and inverter terminations in a garage panel. The crew will use ladders, harnesses, and insulated tools with lockout steps. The supervisor wants each hazard tied to the right authority. Which safety regulation assignment correctly links OSHA and NFPA roles for fall and electrical hazards?
• An associate assists opening a residential AC disconnect before cleaning an inverter, the circuit feeds from a main panel across the garage, and tools and a ladder crowd the working space. Which de-energization, lockout/tagout and working-clearance practice best protects the crew?
• A two-person crew must move a 74 pound inverter from the delivery pallet across a gravel yard to an equipment wall, then lift it onto a bracket at chest height. Company policy requires two people or wheeled equipment above fifty pounds, and the loose gravel is too soft for the pallet jack. The lifting rule also says to keep the load close to the body and turn the feet instead of twisting. Which handling approach meets the weight limit, the surface condition, and the body-positioning rule for this move?
• A solar maintenance crew washes carport modules weekly with a concentrated caustic cleaner. Two workers still get stinging hands and red forearms even though they wear the gloves and goggles named on the safety data sheet, and the irritation mostly starts when they open the drum and dilute the concentrate. Handling training was refreshed last month. Which control should the safety officer prioritize to reduce the crew's chemical exposure?
• You lead orientation for a four-person crew starting a two-story home install with attic work, battery boxes with acid, and possible roof falls and arc faults. The general contractor asks what the crew will do if someone is hurt, exposed, or trapped aloft. Which emergency response plan scope should the safety lead present for first aid, hazmat, fire, and fall rescue?
• A pallet of flooded lead-acid batteries arrives at the warehouse and one case has cracked, spilling electrolyte onto the wooden pallet. The receiving lead and helper are already in acid-rated gloves and face shields, and the spill is small enough for the crew to handle. Cleanup must stay at the pallet so the dock keeps running, and the acid must be neutralized before anything is wiped up or discarded. Which spill-response step should they take first for the battery acid?
• A crew must trench 24 inches for conduit to a ground-mount footing area where old paint shop runoff stained soils and utility flags look faded. Overnight rain has left standing water in the open trench. Which digging hazard control should the lead enforce to address trenching, utilities, footings, and soil risks?
• An associate must verify zero voltage at a rooftop combiner after opening the disconnect, midday sun keeps modules live, and the meter was dropped last week on concrete. Which practice for using electrical test equipment safely best ensures a trustworthy reading?
• A crew is staging 24 modules, rail, and flashing for a rooftop array on a two-story office building. The structural drawing says staged loads must sit on the open-web joists at four feet on center, the roofing warranty requires protection boards under anything set on the membrane, and the two-foot strip along the eave is a cantilever rated only for foot traffic. Which staging arrangement satisfies the framing, warranty, and edge restrictions?
• A two-person crew stages a steep residential install with a leading-edge eave, an open skylight curb, and brittle shake areas that break underfoot near the ridge. Which assessment correctly identifies fall hazards such as leading edges and roof openings for this crew?
• During a walk-through of a 400-module commercial rooftop job, the general contractor's safety officer asks who attended last Friday's safety meeting and where the crew finds hazard information for the roof sealant. Which pair of records answers both the attendance and the hazard-location questions?
• During a service call a tech must shorten a length of steel strut that is only propped against the equipment rack. The truck has a 4-1/2 inch cordless angle grinder with a grinding disc installed, its guard rotated out of the way, plus a box of same-size cut-off wheels. How should the tech set up the angle grinder and the strut before cutting?
• A two-person crew mixes and pours six concrete piers for a ground-mount array on a hot morning. Wet mix splashes at ankle height, bagged mix puffs dust when opened, the mixer runs continuously, and cut rebar tails stand above every form. Which combination of PPE and site controls addresses every hazard present during this pour?
• A two-person crew arrives for a July rooftop survey in Arizona, 102F with high sun, no wind, and finds pigeons nesting under a prior array plus wasp activity at the eave. One tech feels dizzy and the tile is too hot to kneel on. Which control should the lead apply first to address environmental hazards from heat and animals?
• At noon an installer must service a home array where one combiner shows burn marks and the inverter display is dark. The roof is bright, the rapid shutdown switch is by the main panel, and the owner asks if the roof is now safe. Which electrical safety assessment explains the risk of energized or faulty equipment including rapid shutdown?
• You troubleshoot a daytime rooftop string with a suspected ground fault before opening the combiner, with the inverter still connected and conduit showing burn marks. The array stays live in sunlight and AC remains backfed. Which hazard assessment correctly identifies DC and AC shock, arc flash, and ground-fault risks?
• A two-person crew arrives for a home rooftop job with harnesses, a ladder, and a corded drill that sat in a damp truck overnight. The lead asks for a pre-use check before anyone climbs or starts drilling. Which pre-use inspection routine should the crew apply to confirm safe work practices?
• A technician must replace a blown bus fuse in a distribution panel at a fire station. The panel is fed both by the utility service and by a generator through an automatic transfer switch, and the crew has opened, locked, and tagged both handles. Which check proves the panel is de-energized before anyone touches a conductor?
• Your crew will stage a two-day home install on a busy corner lot where kids cut through the yard, pallets and ladders sit overnight, and the neighbor runs a daycare next door. Which site-access control should the safety plan require to limit public exposure during this work?
• A crew stages 50-pound modules from a floor stack onto a waist-high material lift for a two-story roof. The path is clear and dry, a coworker is free, and site rules require two people above 40 pounds, a squat lift from floor stacks, and pivoting the feet through the quarter turn at the lift. Which handling approach meets the weight and body-positioning rules for this job?
• During a battery retrofit in a garage, the crew finds a swollen lithium cabinet, a cracked lead-acid case with dried acid, plus sharp sheet-metal offcuts and dusty concrete cutting nearby. The schedule is tight and the homeowner is watching. Which handling sequence best controls chemical and physical hazards safely?
• A two-person crew must unload a 260-pound battery cabinet from a rental van parked on a gravel driveway that slopes down toward the street. The van carries a folding ramp, an appliance dolly, and wheel chocks, and no other help is on site. Which action best keeps the van and the heavy cabinet under control?
• An apprentice must help replace a swollen 48-V storage battery in a dim garage with old wiring, metal shelving, and no sink nearby. The lead wants acid, arc, and eye risks covered before covers come off. Which battery safety setup follows insulated tools, face and eye protection, eyewash, gloves?
• A foreman writes a one-page plan for a three-story retrofit where a worker uses a harness near a skylight, a forklift moves pallets, and old batteries leak in storage. Which element should the emergency response plan include to cover first aid, hazmat, fire, and fall rescue for this site?