A bonding clip may occupy one line in a solar mounting bill of materials, but its evidence does not stand alone. The electrical path depends on the exact module frame, rack or rail, clamp or clip, fasteners, finishes, ground lug, array configuration and installation instructions. “UL 2703 grounding clips included” is therefore not enough to compare two quotations.
This guide helps buyers assemble a reviewable RFQ package. It does not approve an electrical design or replace the applicable code, listing, manufacturer instructions or authority having jurisdiction. Keep structural questions in the solar mounting bracket corrosion and load guide; the focus here is the continuity and traceability of the bonding path.
Treat the bonding device as part of a system
Bonding joins exposed conductive parts into an intentional electrical path. The equipment grounding conductor then connects the bonded assembly into the project’s grounding arrangement. In a mounting RFQ, those functions should be shown on a path drawing rather than collapsed into the word grounded.
UL Standards & Engagement currently marks UL 2703 active, with its latest revision dated April 28, 2026. The public scope covers mounting grounding and bonding devices and clamping or retention devices for specific manufacturer and model-designated PV modules and panels. The words specific manufacturer/model designation matter: a familiar-looking clip is not automatically supported with a different frame, rail or fastener. UL 2703 official scope and revision record.
UL Solutions also explains that UL 2703 covers mounting systems, mounting devices, clamping devices and ground lugs. Its overview connects correct bonding and grounding with a conductive path that supports operation of overcurrent and ground-fault protection. That is a system safety function, not a decorative hardware feature. UL Solutions PV mounting systems certification.
Start the RFQ with the module manufacturer, exact model family, frame height and relevant frame geometry. Add the racking manufacturer, system name, rail or rail-less configuration, clamp and attachment part numbers, roof- or ground-mounted use, and planned array layout. If those inputs are unknown, ask for a controlled list of assumptions and make technical release conditional on reconciliation with the final design.
Verify what the certification actually covers
A certification reference can cover less than a buyer expects. UL’s official Question Corner says that simply confirming a component is UL Certified to UL 2703 is insufficient. A product may have been investigated for mechanical loading, grounding and bonding, fire classification, or a combination, and bonding devices may be evaluated only with identified modules, frames and mounting rails. UL directs reviewers to the individual QIMS certification in Product iQ for the covered parameters and installation criteria. UL Question Corner on UL 2703 installations.
Ask each bidder to provide the relevant listing or certification record, category and file number, plus the current installation manual and module-compatibility schedule. Compare the quoted part numbers with those records. A certificate title, sales brochure or statement that a component was “tested to UL 2703” does not identify the evaluated function or prove that the delivered combination is included.
Keep the listing boundary visible in the comparison. Mechanical load evidence does not by itself prove an electrical bonding path. A bonding evaluation does not supply the site-specific structural design. A system fire classification may depend on particular modules and installation conditions. The solar module clamp-zone guide addresses the separate interface between the module frame and its approved mounting zones.
Draw the path through every row and break
Require a diagram that starts at each module frame and follows the conductive path through clamps, clips, rails, splices, couplings, row transitions and the identified ground lug. Mark thermal-expansion gaps, structural separations and any point where a module can be removed. The diagram should show whether continuity remains after the removal that the project’s maintenance plan permits, or which isolation and re-bonding procedure applies.
IronRidge’s RockIt installation manual provides a useful named-system example. Revision v1.5, dated May 28, 2026, assigns north-south and east-west bonding functions to different system components, requires an approved ground lug for each continuous array, and gives a separate method for bonding across a thermal expansion gap. It also publishes a list of compatible module families. These instructions support the identified RockIt configuration only, but they show why an RFQ needs more than a count of clips. IronRidge RockIt installation manual.
Do not copy its component count, gap treatment or lug location into another mounting system. Request the current instructions for the quoted system. If a row, rail segment or structural zone has no documented path across a break, place that interface on hold. If a jumper or additional lug is required, identify its conductor, terminals, attachment hardware, routing and environmental suitability in the BOM.
Control the contact surfaces and materials
Many bonding devices create contact by penetrating or displacing an insulating surface layer on an aluminium frame or rail. That function depends on the approved hardware, orientation, surface and tightening condition. Ask the supplier to name the clip material and finish, matching frame or rail surface, fastener part number, installation tool, torque or stop condition, and any restriction on reuse.
Do not turn one manufacturer’s torque into a generic requirement. Torque depends on thread, coating, joint geometry and instructions. Keep thread and galling evidence in the solar mounting fastener RFQ guide, then link the approved fastener back to the bonding assembly.
Environmental compatibility matters because a conductive joint must remain effective after installation. The US Department of Energy describes galvanic and crevice corrosion in PV assemblies and notes that dissimilar metals, moisture and poor fastener selection can degrade bonding points. Its illustrated example shows a bonding device piercing aluminium anodizing to form a conductive pathway and explains that corrosion can raise resistance through the joint. DOE guidance on managing solar PV corrosion.
Translate that risk into evidence rather than an unsupported life claim. Request the approved material combination, applicable corrosion or environmental qualification, contact-surface preparation, prohibited compounds and inspection guidance. State site exposure such as marine salt, industrial contamination or agricultural gases so the responsible designer and system manufacturer can assess suitability.
Build a comparable evidence schedule
Use the same fields for every bidder. This keeps a complete system response from being compared with a low-cost clip quotation that omits the rail, lug or inspection controls.
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| RFQ evidence field | Required supplier record | Hold point before release |
|---|---|---|
| Evaluated system identity | Module and frame, rack or rail, clip or clamp, fasteners and ground-lug SKUs tied to the applicable listing and manual revision | “UL 2703 compliant” without the covered function or compatible combination |
| Continuous bonding path | Marked path through modules, rows, joints and array sections, including every thermal or structural break and EGC interface | A gap, splice, replacement condition or row transition has no documented treatment |
| Installation and change control | Approved tool or torque method, surface condition, inspection cue, lot identity, photo record and controlled substitution process | Material, finish, frame or hardware changes without evidence review |
Ask who owns each deliverable: the mounting-system supplier, module supplier, project designer, installer or inspection authority. The component vendor cannot approve a site design unless that responsibility is documented. Likewise, an installer’s photograph can demonstrate an observed condition but cannot expand a certification beyond its stated combination.
Plan installation and handover evidence
The California Solar Permitting Guidebook’s inspection material calls for modules and racks to be bonded according to listed and approved manufacturer instructions using supplied or identified hardware. Although that guide references a particular California code cycle, its evidence lesson is useful: the field record should trace the installed hardware to the approved plan and instructions. California Solar Permitting Guidebook, PV inspection section.
Before shipment, agree which items are checked on every assembly and which may be sampled. Useful records include package or lot identity, part markings, module and rail model, hardware orientation, installed condition, ground-lug location, treatment of each array break, and authorized deviations. Define the photograph angle needed to see the relevant interface; a distant array photo cannot confirm a concealed clip.
Also define the response to module replacement. The maintenance record should identify the compatible replacement frame and hardware, whether the bonding device is single-use, and how the path is restored and inspected. Do not accept an undocumented field substitute merely because its dimensions appear similar.
Send a system-level bonding RFQ
Send the module model and frame drawing, racking BOM, array layout, thermal or structural breaks, site environment, jurisdiction and evidence schedule. Ask bidders to return the exact listing scope, current manual, compatibility schedule, bonding-path diagram, ground-lug interface and substitution rules.
Send a solar mounting bonding RFQ
Buyer FAQ
Can we specify one universal bonding clip for several racking brands?
Do not assume universality. Verify the exact clip, module frame, rack or rail, fasteners and use conditions against the individual certification and current installation instructions. A shared physical size does not establish the same evaluated electrical path.
Does a UL 2703 mark on the rack prove the bonding function?
No. UL states that a certification can cover mechanical loading, grounding and bonding, fire classification, or only some of those functions. Review the individual QIMS record and confirm that its covered combination matches the quotation.
Which changes require the bonding evidence to be checked again?
Changes to the module frame, finish, rail, clamp, bonding device, fastener, ground lug, array breaks or installation instructions can affect the documented path. Route them through the project’s technical change process before shipment or field use.
What should the installation record show?
Record the identified hardware, locations, approved installation method, inspection result, treatment of array gaps, ground-lug connection and every authorized deviation. The record should make the installed combination traceable without claiming that a photograph replaces design or certification review.