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Some Canadian J1772 are 70 amps. If I use a J1772 adapter and connect the P85 (US model) to such a connection, will the adapter limit the amperage to 30 amps?
I recently installed two 100 amp J1772 stations at my office. They can deliver 80 amps continuous. I have the twin chargers and it works beautifully with my J1772 adapter. Of course if you only have the single on board charger, all you'll get is 40 amps.
Be careful about whether EVSE's are described by Circuit Breaker rating or output current rating. Sun Country Highway and their major supplier, Clipper Creek, label and describe the EVSE's by the breaker rating; this is often typical in Canada. To avoid popping conventional circuit breakers, it is strongly recommended that continuous loads not be run at more than 80% of breaker rating. Therefore a 100A circuit can feed an 80 Amp J1772, a 50A circuit can feed a 40 Amp UMC, etc. In most U.S. locations, EVSE's are described by their output current rating.
Having said that, you're right about the confusion. It probably makes more sense to talk about the output current. Even in Canada, the Chargepoint, Schneider, Eaton, GE etc. stations show their output current, not the input breaker size. It does seem to be a Sun Country/Clipper Creek phenomenon.
US and Canadian electrical codes have definitions for "continuous load" and EV charging fits in to that category. In a "continuous load" scenario, current is limited to 80% of the breaker capacity by code. It is more than a "strong recommendation", and is why a 100 amp Clipper Creek EVSE will only deliver 80 amps.
The wiring is rated for 100% current. It is the vast majority of thermal/magnetic circuit breakers that are limited to 80% of rating for continuous loads to avoid false trips.
Better yet, talk about output power. 80 Amps at 208V is (obviously) less power than 80 Amps at 240V, but 16kW is 16kW. I realize that EVSE manufacturer's do not control whether their equipment is installed on a 208V circuit or a 240V circuit, but on sites like Plugshare, it makes sense to state the power (kW) output by the EVSE for that location.
Right. This is what I was referring to (from the Canadian codes, but US are similar). The SCH / Clipper Creek units are all built for 100% of their rating. The wiring is rated for 100%, but according to code, can't be utilized at 100% in a continuous duty application. The breaker, as you say, would trip after a few minutes of 100% load.
It is also worth noting that the J1772 standard, I believe, is limited to 80 amps.
...
(5) Where a fused switch or circuit breaker is marked for continuous operation at 80% of the ampere rating of
its overcurrent devices, the continuous load as determined from the calculated load shall not exceed
(a) 80% of the rating of the circuit where the ampacity of the conductors is based on Column 2, 3, or 4
of Table 2 or 4; or