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PV System Mechanical Installation Flashcards

7 cards from real NABCEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 PV System Mechanical Installation flashcards as text

  1. What is the minimum required fire setback distance from a ridge line for rooftop PV systems in many jurisdictions adopting IFC requirements?

    Answer: 3 feet

    The International Fire Code requires a minimum 3-foot setback from ridge lines to allow firefighter access and ventilation during a fire.

  2. When modules are installed in a landscape orientation versus portrait orientation on the same racking system, what mechanical consideration changes?

    Answer: Clamp placement and rail spacing

    Changing orientation affects the module dimension spanning between rails, requiring adjusted rail spacing and clamp positioning.

  3. What is the function of a 'wire management clip' or 'cable clip' used in PV installations?

    Answer: To organize and secure DC wiring to the racking rail to prevent abrasion

    Cable clips secure conductors to rails, preventing movement that causes chafing, abrasion damage, and potential faults.

  4. Which standard governs the structural design loads (wind, snow, seismic) that must be applied to PV mounting systems in the United States?

    Answer: ASCE 7

    ASCE 7 (Minimum Design Loads and Associated Criteria) specifies the wind, snow, and seismic loads used for structural design of PV mounting systems.

  5. A carport-style ground mount PV system must support vehicle loads below and PV above. What additional structural consideration is required compared to a standard ground mount?

    Answer: Increased column sizing and cross-bracing to handle combined gravity and lateral loads

    Carport structures must carry both the PV array loads and provide overhead clearance, requiring heavier column design and lateral bracing for wind and seismic loads.

  6. When using a hammer drill to install lag screws into roof rafters, what step should be taken first to ensure structural integrity?

    Answer: Pre-drill a pilot hole slightly smaller than the lag screw shank

    A pilot hole prevents wood splitting and guides the lag screw into the center of the rafter for maximum pull-out strength.

  7. What is the purpose of applying butyl tape or roofing sealant around a lag bolt after installation in a composition shingle roof?

    Answer: To create a watertight seal around the roof penetration

    Sealant or butyl tape fills the gap around the fastener penetration to prevent water infiltration into the roof structure.