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I'm guessing the first image means that something is very hot inside the pocket.

L21 is generally used for 3-phase 208V. It is also possible that the OP is on a 3-phase delta 240V system - I'm not really sure what receptacles are approved for those. But EVSEs *should* work with both 208V and 240V. A plug converter will work - you just take 2 of the phases to get...

AFCI breakers are actually only connected to hot and neutral, no ground. I took a quick look at the Leviton AFCI receptacle installation guide and it indicates that the ground connection is optional. Put simply, yes, the ground wire does provide additional protection. GFCIs are intended to...

In general GFCI supersedes the ground wire connection, at least to prevent electrocution. Some (all?) surge protectors shunt excess voltage to the ground wire (in addition to the neutral). So if the ground wire were missing you would lose some surge protection. Having the ground wire also...

GFCI protection does not require a ground - it triggers based on the current flowing between hot and neutral. In a proper circuit 100% of the current flowing from hot will return through neutral. If there is an imbalance - i.e. if some current is taking an unexpected path, like through a damaged...

While the Juicebox Pro is "portable" in that it doesn't have to be permanently mounted to the wall, the box is fairly large and the cord is extremely bulky and rigid compared to the Turbocord, Duosida, etc.