Ultra Rail Installation Manual

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Certiﬁcation Details

SnapNrack Ultra Rail system has been evaluated by Underwriters Laboratories (UL) and Listed to UL/ANSI Standard 2703

for Grounding/Bonding, Mechanical Loading, and Fire Classiﬁcation.

The Ultra Rail system has been designed in compliance with UL Standard 2703 Section 9.1 Exception, which permits

accessible components that are not part of the fault current ground path to not be electrically bonded to the mounting

system (e.g. roof attachments, array skirt, etc.). For more details on the integrated grounding functionality see the

Grounding Speciﬁcations section.

This racking system may be used to ground and/or mount a PV module complying with UL 1703 only when the speciﬁc

module has been evaluated for grounding and/or mounting in compliance with the included instructions. See the Grounding

Speciﬁcations for the list of modules tested with the Ultra Rail system for integrated grounding.

Ground Lugs have been evaluated to both UL 467 and UL 2703 Listing requirements.

Ultra Rail has been listed with the following Enphase microinverter models for grounding/bonding: M215, M250, and C250.

The Enphase microinverters are certiﬁed to be mounted to SnapNrack rail with the MLPE Attachment or to the module

frame with the Enphase Frame Mount. When installing the Enphase microinverters per the speciﬁcations in the MLPE

Installation section of this manual, the total roof-mounted PV system is bonded (modules, racking and microinverters)

and grounded through the Enphase ground circuit when the Enphase units are properly grounded through to the service

entrance. Therefore, no ground lugs or equipment grounding conductor (EGC) are required on the SnapNrack systems.

Ultra Rail has been Listed with the following SolarEdge optimizer models for grounding/bonding: P300-5NC4ARS, P320-

5NC4ARS, P370-5NC4AFS, and P400-5NC4AFS. The SolarEdge optimizers are certiﬁed to be mounted to SnapNrack rail

with the MLPE Attachment or to the module frame with the SolarEdge Power Optimizer Frame-Mounted Module Add-

On. When installing the SolarEdge optimizers per the speciﬁcations in the MLPE Installation section of this manual, the

total roof-mounted PV system is bonded to the optimizer backing plate (modules, racking and optimizers) and grounded

through the ground lugs installed on the SnapNrack rail. Therefore, it is not necessary to run an EGC to each SolarEdge

optimizer.

Note: Frame-Mounted Module Add-On has been evaluated for all modules except Suniva modules.

Ultra Rail has been Listed with the following Ginlong Rapid Shutdown Units for grounding/bonding: Solis-RSD-1G 1:1

and Solis-RSD-1G 2:2. The Ginlong Rapid Shutdown Units are certiﬁed to be mounted to SnapNrack rail with the MLPE

Attachment.

The mounting system Bonding Listing is only valid when installed with a Non-Separately Derived PV system. The PV system

is required to have a direct electrical connection to another source, such as connecting to the grid via a grid interactive

inverter.

SnapNrack recommends that bare copper never come into contact with aluminum.

Grounding/Bonding

The Ultra Rail system is Listed for mechanical loading for dierent load ratings depending on the mounting conﬁguration

and PV module installed. For more details on the mechanical loading details see the Mechanical Loading Speciﬁcations

section.

SnapNrack engineered systems should only be used with SnapNrack components and hardware. Any application outside

of those speciﬁed in this Installation Manual and the Structural Engineering Report may void the warranty and structural

certiﬁcation could become invalid.

If the module clamps have been engaged and need to be loosened and reengaged, SnapNrack recommends moving the

module frame 3mm to engage the bonding pin in a new location if required by the AHJ.

The UL Listing covers mechanical load ratings for the various span lengths, module orientations and positive, negative, and

side load ratings. These values can be found in the Mechanical Loading Speciﬁcations section.

SnapNrack recommends a periodic re-inspection of the completed installation for loose components, loose fasteners, and

any corrosion, such that if found, the aected components are to be immediately replaced.

Mechanical Loading