This now applies when replacing equipment that has both 120 and 240 loads. It
doesn't apply to equipment with only 240V loads like for charging EVs and
welders, plasma cutters, air compressors. For those of us with lots of 3
conductor wire on hand, the 3 pin connectors like the 10-50 make more sense.
The 4 pin connectors have a different shaped pin for earth and using a neutral
pin for earth might be a misuse, but the J1772 connector does this.
Phil
On Thursday, February 12, 2026 at 10:34:04 AM EST, Lee Hart via EV
<[email protected]> wrote:
A historical note: In the US, the NEC requires all kitchen outlets need to be
GFCI protected. UL requires all kitchen appliances to have all exposed metal
parts grounded. But these are not legally required unless the local building
codes cite the NEC and UL regulations.
BUT... for decades, the electric kitchen range manufacturers lobbied hard and
got an exception. Ranges used a 3-pin connector with NO GROUND and NO GFCI.
Instead, it had two hots and a neutral. They used the neutral as their
"ground". Any 120v devices in the range (light bulbs, fans, etc.) were wired
between one of the hots and neutral. This was obviously less safe (but saved
them money).
--
Excellence does not require perfection. -- Henry James
But it *does* require attention to detail! -- Lee Hart
--
Lee A. Hart https://www.sunrise-ev.com
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