CSA C22.2: Canada Electrical Safety Standard for Solar PV

Definition

CSA C22.2 is the Canadian Standards Association's electrical safety standard series, including solar PV listings. Equivalent to UL listings for the US; harmonized in many cases via UL/CSA joint testing.

Key Takeaways

CSA C22.2 = Canadian electrical safety standard series.
Equivalent in scope to UL listings used in the US.
Joint UL/CSA listings are common in North America, so many products carry both marks.
Required for solar equipment installed in Canada; not a substitute for a US UL listing on a US project.

What CSA C22.2 Covers

CSA C22.2 is not a single document but a series of standards published by the Canadian Standards Association, each addressing a specific category of electrical equipment — inverters, PV modules, junction boxes, connectors, and racking hardware among them. A product is “CSA C22.2 listed” when an accredited testing lab has confirmed it meets the relevant part of that series for construction, insulation, grounding, and fault protection. In practice, the standard plays the same role in Canada that UL listings play in the US: it’s the baseline evidence an AHJ or utility asks for before approving equipment for interconnection.

Why Joint UL/CSA Listings Matter

Because the underlying safety requirements in the US and Canadian standards overlap heavily, testing labs frequently run a single evaluation and issue a joint UL/CSA listing report. That’s why it’s common to see both a UL number and a CSA C22.2 designation printed on the same inverter or module datasheet. For an engineer specifying equipment on a cross-border portfolio, that joint mark is the quickest way to confirm a product is eligible for permitting in either country without needing a second round of certification.

For a look at how equipment listings show up inside an actual permit package, the solar permit submission checklist walks through the inverter and module documentation an AHJ expects to see, including the UL 1741 listing confirmation that CSA C22.2 mirrors north of the border. If you’re comparing electrical safety standards across module and inverter equipment more broadly, QBITS Energy’s guide to solar inverter certification standards covers the IEC-based listings used outside North America, and its IEC 62109 entry is a useful point of comparison for the inverter safety requirements CSA C22.2 and UL 1741 both address.

Frequently Asked Questions

4 commonly searched questions about CSA C22.2.

What is CSA C22.2?

Canadian Standards Association electrical safety standard for solar PV and other electrical equipment. Equivalent to UL in the US; joint UL/CSA listings common.

Is CSA C22.2 the same as UL 1741 or UL 1741-SB?

They are not the same document, but they cover the same scope for the equipment they apply to. CSA C22.2 is the Canadian electrical safety standard series; UL 1741 / UL 1741-SB is its US counterpart for inverters. Many manufacturers pursue joint UL/CSA testing so one listing report satisfies both markets, which is why datasheets often show "UL 1741 / CSA C22.2" together.

Do I need a CSA C22.2 listing for a US solar project?

No. US permit packages and interconnection applications call for UL listings (such as UL 1741-SB for inverters and UL 1703 or UL 61730 for modules). CSA C22.2 listings matter for equipment installed in Canada, or for confirming that a product carries the joint UL/CSA mark before it's specified across the border.

Why do inverter and module datasheets list both UL and CSA numbers?

Because harmonized UL/CSA testing lets a manufacturer sell the same certified product in both the US and Canada without running two separate test programs. Seeing both marks on a datasheet confirms the equipment is eligible for permitting on either side of the border.