The SnapNrack TopSpeed™ Mounting System is a solar mounting solution designed for residential solar modules, prioritizing ease of use, quality, aesthetics, and safety. It has been evaluated by Underwriters Laboratories (UL) and Listed to UL Standard 2703 for Grounding/Bonding and Fire Classification. The system is suitable for steep-sloped and low-sloped roofs with Type 1 and Type 2 modules, and can be installed without height restrictions for System Fire Classification.
Function Description:
The TopSpeed™ Mounting System provides a secure and integrated method for attaching PV modules to rooftops. It is designed to simplify the installation process by reducing labor, material, and total installation costs. The system incorporates integrated wire management, aesthetics, and leading "Snap-in" features. It facilitates grounding and bonding of PV modules and associated equipment, ensuring compliance with electrical codes and safety standards. The system supports various module types and configurations, including those with Module Level Performance Enhancers (MLPEs) and Rapid Shutdown Devices (RSDs).
Important Technical Specifications:
Grounding/Bonding:
- Evaluated Components: Mount Assembly (Mount Clamp Top, Module Clamp Tower, Angle Bracket), Clamp Assembly, Universal Skirt, Universal Skirt Clamp, Ground Lugs, and Smart Clips.
- Ground Lugs: SnapNrack model 242-92202, Ilsco models GBL-4DBT and SGB-4.
- Fault Current Ground Path Components: TopSpeed™ Mount Assembly, Clamp Assembly, Wire Management Clips, and Ground Lugs.
- MLPE Bonding: SnapNrack MLPE Frame Attachment Kit model 242-02151 bonds approved MLPE device back plates to module frames.
- Module Compatibility: Evaluated for use with UL 1703 or UL 61703 compliant PV modules. Appendix A lists approved modules.
- Module-to-Module Bonding: Dynobond device (Dynoraxx E357716) provides module-to-module bonding.
- Row-to-Row Bonding: Provided by bonding clips in the Mount assembly and Clamp assembly.
- Column-to-Column Bonding: Provided by Universal Skirt and bonding clips in the Clamp assembly and/or the RL Universal Link assembly.
- Equipment Grounding Conductor: Each continuous array connects to an Equipment Grounding Conductor through a Ground Lug (242-92202) installed on one module per array.
- Ground Lug Marking: The Ground Lug is marked with a ground symbol.
Fire Classification:
- Class A System Fire Classification for steep-sloped and low-sloped roofs with Type 1 and Type 2 modules.
- Tested at 5 inches above the test roof fixture, allowing installation without height restrictions.
- The Skirt is an optional component and does not affect the Fire Classification Rating.
- Modules with an asterisk (*) have different fire ratings (not Type 1, 2, or 29) and have not been evaluated for use with SNR systems.
Hardware Torque Specifications:
- All TopSpeed™ 1/2" bolts (System Leveling Bolt, TopSpeed™ Mount Clamping Bolt, Clamp Bolt): 16 ft-lb.
- Ground Lug model 242-92202 to Module Frame or TopSpeed™ Mount, and to Grounding Electrode Conductor (6-12 SOL): 8 ft-lb.
- MLPE Frame Attachment Kit, MLPE Rail Attachment Kit: 10 ft-lb.
- SolarEdge Frame Mounted Microinverter Bracket to Module Frame: 11 ft-lb.
- Enphase Frame Mounted Microinverter Bracket to Module Frame: 13 ft-lb.
- Ground Lug model SGB-4 to module: 75 in-lb.
- Ground Lug model SGB-4 to Grounding Electrode Conductor (4-14 SOL or STR): 35 in-lb.
- Ground Lug model GBL-4DBT to module: 35 in-lb.
- Ground Lug model GBL-4DBT to Grounding Electrode Conductor (10-14 SOL or STR): 20 in-lb.
- Ground Lug model GBL-4DBT to Grounding Electrode Conductor (8 SOL or STR): 25 in-lb.
- Ground Lug model GBL-4DBT to Grounding Electrode Conductor (4-6 SOL or STR): 35 in-lb.
- MLPE Frame Attachment Kit mounting bolt: 12 lb-ft (144 lb-in).
Structural Components:
- TopSpeed™ Mount: Assembly includes SpeedSeal™ base, clamp top, and (4) SnapNrack #14 SS Wood Screws with 1/2" Hex Head.
- TopSpeed™ Clamp: Assembly includes Link bottom, Link top, and springs.
- Universal Skirt: Available in double portrait or single landscape lengths.
- Skirt Spacers: For 40mm, 38mm, 35mm, 32mm, and 30mm modules.
Wire Management Components:
- Smart Clip: Module frame cable clip, holds two PV wires or one Enphase IQ-Cable.
- Smart Clip XL: Module frame cable clip, holds six PV wires or four Enphase IQ-Cables.
- Wire Saver: Secures loose conductors below the array, holds one conductor.
MLPE/RSD Installation:
- MLPE Frame Attachment Kit: Attaches MLPEs and other related equipment to the module frame, providing integrated grounding/bonding.
- SolarEdge Frame Mount: For SolarEdge optimizers with Frame-Mounted Module Add-On.
- Enphase Frame Mount: For Enphase microinverters.
Usage Features:
Installation Process:
- Pre-Installation Requirements: Site survey (roof measurements, obstacles, access, setbacks, construction issues), design guidance (0.75-inch spacing between module rows/columns, engineering values, attachment points per module side, plan set integration, roof attachment locations, homerun/Junction Box locations, distance marking).
- Mount to Module Frame Installation:
- Assemble all TopSpeed™ Mounts by sliding the clamp tower assembly into the angle bracket riser and tightening the leveling bolt to 16 ft-lbs.
- Position the TopSpeed™ Mount clamp on the module frame within the module manufacturers required clamping zone.
- Tighten 1/2" clamping bolt to 16 ft-lb. (Only two Mounts are required per module side).
- Best Practice: Attach all TopSpeed™ Mounts to modules on the ground before MLPEs for simplified wire management.
- Install Note: For high load conditions, a third attachment in the middle of the module frame is required.
- Universal Skirt Layout:
- Verify module fit on the roof surface using a tape measure.
- Draw the skirt installation layout on the roof, including module gaps (0.75 inch recommended), bottom corners, and locations for the two TopSpeed™ attachments that clamp to the skirt. Three attachments per module are never required at the skirt.
- Install Note: If environmental load conditions require three TopSpeed™ attachments per module side, this is only required when modules share attachments.
- Mount Skirt Installation:
- Install TopSpeed™ Mounts at marked skirt layout locations, ensuring they are entirely on one course of composition.
- Fill both cavities of the SpeedSeal™ gasket on the bottom of the TopSpeed™ Mount with roof sealant for a watertight seal.
- Attach TopSpeed™ Mount to the roof using the (4) SnapNrack #14 Wood Screws with 1/2" hex head.
- Loosen the Course Adjustment bolt and adjust end Mounts to align with the bottom edge of the array, then tighten.
- Loosen the Leveling bolt, move the clamp up or down to level the TopSpeed™ Mount, then tighten to 16 ft-lb.
- Use a string line to align and level all TopSpeed™ Mounts between the end mounts.
- Add Universal Spacers to Mounts and Clamps where the Skirt will be installed.
- Install Universal Skirt by holding it in the Mount, sliding it to align with array layout marks, and clamping it into the mount.
- Use TopSpeed™ Clamps (or optionally Universal Links) to connect multiple lengths of Array Skirt.
- Wire Management:
- Ground Lug Installation:
- Attach Ground Lug (242-92202) anywhere along the module frame or any TopSpeed™ Mount near the Junction Box. Torque module clamping bolt to 8 ft-lb.
- Run 10 - 6 AWG, solid, bare copper GEC into the Ground Lug channel, torque wire clamping bolt to 8 ft-lb.
- Run bare, solid EGC from Ground Lug R to Junction Box, bond bare EGC to stranded EGC in Junction Box.
- Optionally, install Ground Lug on the Mount Landing Pad at the top of the array.
- Smart Clip Installation:
- Use SnapNrack Smart Clip II for up to two PV wires inside the module frame.
- Use SnapNrack Smart Clip XL for larger bundles (up to 6 PV wires).
- Route conductors away from non-bonded components to prevent damage.
- MLPE & RSD Installation:
- SnapNrack MLPE Frame Attachment Kit:
- Slide the backplate channel of the MLPE device under the MLPE Frame Attachment Kit bolt.
- Position the MLPE Frame Attachment Kit on the module frame flange, ensuring it doesn't interfere with mounting system components and rests against the flange backstop.
- Tighten the mounting bolt to 12 lb-ft (144 lb-in).
- Connect module leads to input connectors and manage conductors with the integrated Smart Clip.
- Install Note: Avoid blocking module frame drainage holes. The kit bonds the module frame, MLPE backplate, and Smart Clip.
- SolarEdge Frame Mount:
- Locate the SolarEdge optimizer with Frame-Mounted Module Add-On on the module frame without interfering with TopSpeed™ Mounts.
- Install the optimizer mounting plate onto the module frame and tighten hardware to 11 ft-lbs.
- Connect module leads to input connectors and manage conductors with SnapNrack Smart Clips.
- Install Note: For portrait modules, install MLPE on the long side; for landscape, on the short side.
- Enphase Frame Mount:
- Locate the Enphase Frame Mount bracket clamp on the module frame without interfering with TopSpeed™ Mounts.
- Slide the microinverter unit onto the bracket clamp and move it slightly left.
- Tighten hardware to 13 ft-lbs.
- Connect module leads to microinverter DC connectors.
- Install Note: The microinverter mounting flange should be on the outside of the module frame. Refer to the Enphase Frame Mount installation guide for additional instructions.
- Module Installation (Bottom Row):
- Recommended Best Practice: Attach all TopSpeed™ mounts to modules on the ground with MLPEs for simplified wire management.
- Install Note: Prepare module leads and connectors with SnapNrack Smart Clips before bringing to the rooftop. Secure leads to the module frame if no MLPE, or to the MLPE device with the SnapNrack MLPE Frame Attachment Kit.
- Rest the downslope edge of the module on the Mounts and/or Clamps, aligning the side edge with the array layout or Skirt.
- Lower the upslope edge of the module, applying slight pressure to seat it into Mounts and/or Clamps.
- Verify the SpeedSeal™ portion of the TopSpeed™ Mounts is entirely on one course of composition. Adjust the base if needed and tighten the bolt.
- Lift the upslope edge of the module and fill the SpeedSeal™ reservoir with roofing sealant.
- Lower the module to the roof and drive the (4) pre-installed SnapNrack #14 Wood Screws into the roof sheathing.
- Repeat for additional modules.
- For staggered arrays or mixed orientation, use the TopSpeed™ Clamp as needed to support modules.
- When installing a TopSpeed™ Clamp for an over-cantilevered module, install it 2-6" from the edge of the upslope (cantilevered) module.
Maintenance Features:
Inspection Practices:
- SnapNrack recommends periodic re-inspection of the completed installation for loose components, loose fasteners, and any corrosion. Affected components should be immediately replaced.
Maintaining Grounding Bonding When Removing a Module:
- CAUTION: Module removal may disrupt the bonding path and introduce electric shock risk. Only qualified persons should remove modules.
- If module removal will break grounding continuity, a jumper assembly must be installed:
- Identify the existing ground path and choose an appropriate length of #10 bare copper wire to bridge the broken path.
- Attach one ground lug (e.g., SnapNrack 242-92202, Ilsco SGB-4, or DroRaxx DynoBond™) to each end of the #10 bare copper wire.
- Before removing the module, attach the assembled bonding jumper.
- Service the array. It is safe to remove the module with the bonding jumper installed.
- After servicing, reinstall the module and original ground path. Only then remove the bonding jumper.
- Caution: Do not remove the bonding jumper until the original ground path is established.
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