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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. Which UL standard specifically covers mounting systems (racks and rails) for PV modules?

    Answer: UL 2703

    UL 2703 covers rack mounting systems for flat-plate photovoltaic modules and panels, including bonding and grounding requirements.

  2. A roof-mounted PV system has rails running parallel to the roof slope (portrait landscape). This rail orientation is called:

    Answer: Parallel (portrait) rail configuration

    When rails run parallel to the roof slope with modules in portrait orientation, this is called a parallel or portrait rail configuration.

  3. What is the maximum recommended unsupported span for a standard aluminum extrusion rail in most residential PV racking systems?

    Answer: 48 inches

    Most residential aluminum rails are rated for spans up to approximately 48 inches between attachment points without exceeding deflection limits.

  4. When installing a PV system on a flat roof with a membrane (TPO/EPDM), what is the primary advantage of a non-penetrating ballasted system?

    Answer: Preservation of the roof warranty by avoiding penetrations

    Ballasted systems avoid puncturing the membrane, which would void most roofing warranties and create potential leak points.

  5. What is the primary mechanical hazard when installing PV modules on a steep-slope roof (>8:12 pitch) without proper fall protection?

    Answer: Installer falling from the roof

    Steep roofs dramatically increase the risk of a worker fall, which is the leading cause of fatality in roofing work; OSHA requires fall protection at 6 feet.

  6. When adjusting the tilt angle of a ground-mounted PV array from 20° to 30°, what structural effect must be recalculated?

    Answer: Wind and snow load forces on the racking structure

    Changing tilt angle alters the wind pressure coefficients and snow accumulation patterns, requiring new structural load calculations for the racking.

  7. In a dual-tilt (east-west) low-slope racking configuration, what is the primary mechanical advantage over a south-facing single-tilt system?

    Answer: Reduced ballast requirements due to self-anchoring row geometry

    East-west rows lean against each other, partially self-anchoring and reducing the ballast weight needed to resist wind uplift compared to south-facing rows.