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The vacuum's power cable did not have a ground. This vacuum had the most five-star reviews on Amazon, but then a minority of people started complaining and leaving one-star reviews, saying they were getting shocked. The reactions from the fanboy crowd were non-sympathetic ("you're imagining it," "it's just static," etc.), and they mass downvoted every one-star review. Some of the people claimed they were getting shocked PRETTY HARD, too, as in it knocked them over. IIRC, even Shark responded saying that it was impossible for the vacuum to shock you. I remember seeing this while looking at vacuums for my elderly mother who has a heart condition. To the electrical engineer in me, everything made sense! I started defending every single one-star reviewer person, and I wrote my own very detailed review with photos of the handle. Soon, the tide turned, and more people started upvoting my review than downvoting it and I even received personal "thank you" messages from the people who got shocked ("finally someone believes me"). It eventually got to the point where a year later in 2014, Shark released an updated model with no more metal strip. Seeing this, I bought the new model for my mother. I'd like to think I can give myself SOME credit for causing them to do that. Not only that, the upvotes from that alone were a good part of the reason I became an Amazon Top Reviewer. #MACBOOK PRO POWER CORD HUMMING PROFESSIONAL#Ī neutral/grounding fault will energize all your home devices with live potential same with a live/neutral swap (unlikely but possible with Indian wiring standards).