![]() ![]() I would agree that ordinarily, a 125% derate would need to be applied by default. We see a lot of blatant "ignoring of Code" among kiln and welder folks, and your current sockets are no exception. Neutral can be energized and float at 120V under a number of common wire failures - that's why we put insulation on it. In sub panels and outbuildings, there's a big difference. The difference is that the neutral pin on a NEMA 10 socket is wired to the neutral of the house, not the ground. The manufacturers insist not to do that, and Paragon voids the warranty when you do. They really should be using the NEMA 6 type receptacle. Usually this involves cutting off the correct socket and then putting "Amateur's choice" of socket, typically based on the existing sockets they have in their home for dryers and whatnot. Several communities, such as welders and kiln people, have "adopted" the defective NEMA 10 as "their private socket" even thought it is wrong. The plugs and sockets are still sold, strictly for direct replacement of a broken plug or socket. Finally around 30 years ago, NEC "put its foot down" and banned NEMA 10 absolutely. Appliance manufacturers and builders dragged their feet on switching to NEMA 14. Unfortunately, this permission was wildly abused. It was expected these would be wired with "/3 w/ground" cables, so the socket could be changed to NEMA 14 in the future. New wire was required to be grounded, but the old 3-prong NEMA 10 connector could be used for awhile to accommodate dryers and ranges with the old cords. However there was still a large inventory of ungrounded 30-50A cabling in the manufacturing pipeline, so an exception was made to allow ungrounded wiring for dryers and ranges only until wire stocks ran out. ![]() Safety grounding became mandatory in the 1960s (NEC 1966). The kiln manufactures supply NEMA 6 receptacles appropriate to the unit, so clearly, "monkey business" has gone on here. It is obsolete and dangerous, and does not contain a ground wire. If you have convenient access to workplace charging, that may also impact how often you choose to charge your electric BMW overnight.The plug, as provided on the new-to-you equipment, is a "NEMA 10-30" type. Keep in mind that how often and how long you should charge your electric BMW depends in part on what kind of home charging option you have and your daily driving needs. Use DC and high-power DC chargers as often as you need, in order to extend the mileage of your electric BMW in a short period of time. While it takes longer, it is less stressful on the high-voltage battery and also a more cost-efficient way to get your range topped up. When not driving your electric BMW for a longer period of time, leave the battery between 20% and 80% charged. However, it is not recommended to charge up to 100% every day – as this can harm the battery in the long run. You can charge the battery up to 100% when you have to rely on the entire driving range of your vehicle (for a longer trip), as occasional charging to 100% doesn’t harm the battery. Staying between 20% to 80% battery capacity should leave you with enough driving miles – and you can use iDrive or your My BMW App to set a target state of charge. The amount of miles you drive daily will determine how much charging you will need. Similar to your cell phone, charging up your electric BMW before a day’s use is simple.
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