Do Canadian NEMA outlet codes differ from the US for EV charging?

On ground truth: after field-testing chargers with both US and Canadian NEMA dryer outlets, adapters sold as universal in the US have triggered Canadian inspector pushback more than once in my sample set. Bonding neutral to ground is the usual culprit flagged. You can still charge, but you might fail the electrical sign-off or insurance claim if anything goes sideways. If your electrician is flagging it, take them seriously—most headaches come from assuming cross-border code is identical, when local wrinkles make all the difference.

Tried using a US 10-30 to charge up north—forgot about the neutral/ground situation. Adapter got hot, and the inspector gave me that long, disappointed stare. Didn’t catch fire, but my pride got singed.

You've got the right idea but the citation people keep reaching for generically is Section 10 of the CEC (bonding and grounding) combined with the Section 8 load calculation rules for a shared branch circuit — that's the actual mechanism behind the neutral/ground restriction, not just "Canada is stricter." The practical trip-up: a lot of older 10-30 dryer circuits on both sides of the border were wired with a bonded neutral-ground at the receptacle under the old rules, and that's exactly the configuration that fails a modern inspection now — it's less a US-vs-Canada thing and more an old-code-vs-new-code thing that happens to show up more in Canadian building stock depending on when it was wired. A US-bought adapter isn't illegal because it's American, it's that it assumes a 3-wire bonded configuration your inspector may no longer allow. Worth having your electrician pull the actual permit language for your municipality before you buy anything cross-border.

Four years of using adapters in Minneapolis. Never trusted a US-bought 10-30 adapter on a Canadian outlet after a road trip mishap — the plug was fine but the wiring got flagged by an Ontario inspector. Not worth the guesswork.

The outlet shapes themselves are the same NEMA parts on both sides of the border — a 10-30 or 14-50 looks and mates identically whether it was bought in Vermont or Ontario. What's different is the wiring and bonding behind the faceplate, which is the neutral/ground issue people keep running into with older 10-30s. Amp rating conventions track pretty closely too — 30A breaker for a 10-30/L6-30, 50A for a 14-50 — so it's not really "different outlet code," it's the grounding rules that trip people up crossing the border, not the plug shape or the breaker size.

It's the same relationship as NEC and US states, just one level up — the Canadian Electrical Code (CSA C22.1) is the national model code, and each province adopts it with its own amendments and enforcement timeline, same as how states adopt and tweak the NEC. So you get a shared national baseline (which is where the neutral/ground bonding rules people are describing come from) plus provincial wrinkles on top, which is exactly why "my electrician in Ontario flagged it" doesn't automatically tell you what a Quebec or BC inspector would say about the same outlet.

Same plug, different paperwork problem. J1772 on the vehicle side isn't a US-vs-Canada standard, it's the same connector across North America, so a US-bought EVSE's actual charging plug works fine in Canada. What can trip you up is the listing on the box: a unit that's UL-listed for the US market doesn't automatically carry CSA certification, and a lot of Canadian jurisdictions and insurers want to see the CSA mark (or a UL mark with the C-UL designation showing it's also certified to Canadian standards) before they'll sign off on a permanent install. Check the label for a "cUL" or "CSA" marking before you assume a US unit is good to go north of the border — that's a bigger practical issue than the wall plug.