Marshall Headphones’ Bluetooth speakers are getting an Alexa update | 19mm Momentary Push Button

Finally, only consider charging units that have been tested and certified for safety by an independent source like Underwriters Laboratory (UL). And if you’re having a charger installed outdoors, make sure it’s rated for that purpose.

If you had a mains-voltage shock once and got away with it, you were lucky, that doesn’t mean the voltage is safe, you were merely playing a game of Russian Roulette with Ohm’s Law and a low impedance high voltage supply. Your domestic mains can dump the hefty amounts of current your home heating, your cooker, or your electric kettle demands, so if it finds a low resistance path through you then it is going have no problems dumping whatever current Ohm’s Law allows it to through that path. The chances are if it happens to you the path will be a high enough resistance that you’ll only get a very nasty jolt and live to tell the tale, but if it’s not your lucky day the resistance will be low enough that you’re just going to sit on the end of it twitching until the power is turned off, whether you’re alive or not. That’s the gruesome truth. Mess with this stuff and you can die, end of story. You are responsible for keeping yourself safe, and this is not a joke. OK? Now to work!

Earthing is thus a vital part of power distribution safety. The only snag with open equipment on your bench is that any earth connection becomes a valid part of the return circuit for the power, and since that earth connection can come through you, that’s dangerous. The isolating transformer breaks that earth circuit for your bench, thus removing that particular hazard. The upshot of this is that you can safely touch either one of the two wires and because there’s no path to ground, you won’t get zapped. (Touching two wires completes the circuit. You still have to be careful!) Isolation transformers are also used to lift the ground so that you can connect mains circuitry up to your oscilloscope, even though the black probe clip is connected to earth ground.

Fast AF. Phase-detect AF doesn’t hunt like contrast-detect, making for fast, smooth AF during movies. (Click to download 4.9MB MP4 file.)

Before the code prohibited it, it was common practice to share neutrals between circuits. It was customary to pull three hot conductors – fed from three different phases on a three-phase system – a neutral and a ground into a single conduit in commercial facilities. The assumption was that the neutral carried only the unbalance between the three phases, and that would never exceed the highest current in a phase conductor. Now, you can’t do that anymore, unless you use a three-pole circuit breaker, handle ties, or a three pole disconnect switch.

In my experiences, TRIACs fail shorted more often than explode. We have a failsafe of cutting off a mechanical relay in case it happens. Exploded TRIACs do happen though, in the rare case when the load has high leakage to earth, which we don’t have ground fault detection on our devices at the moment. TRIAC we use is rated for 40AMPS @ 600V though for industrial temperature control applications.

Your friend died of what and why? Testing mains voltage across the back of his hand? Please. Mains voltage is not scary if you know what you are about. I dealt with volts up to 132KV and mega amps and megawatts in my career I worked in the UK electrical power industry.

Whether you call it neutral or ground is (I suppose) not important, what is important is that there is no distinction between neutral and ground until you are at the customer’s meter.

Keep in mind that extension cords running from a generator can power anything that plugs into a wall socket, but not hard-wired appliances such as a furnace, sump pump or central air conditioner. If you want to run any of those during an outage, you will need to have a licensed electrician install a manual transfer switch (it looks like a mini circuit breaker) next to your main electrical panel. A heavy-duty cord from the generator plugs into the switch and allows you to power select circuits in your home. Prices vary depending on your market. In Neale’s case, she paid about $1,200 for the switch and installation, more than for the generator, which cost about $550.

Fukoku Mutual Life Insurance Company increased its stake in Amazon Com Inc (AMZN) by 13.24% based on its latest 2018Q3 regulatory filing with the SEC. Fukoku Mutual Life Insurance Company bought 550 shares as the company’s stock declined 15.37% with the market. The institutional investor held 4,705 shares of the consumer services company at the end of 2018Q3, valued at $9.42 million, up from 4,155 at the end of the previous reported quarter. Fukoku Mutual Life Insurance Company who had been investing in Amazon Com Inc for a number of months, seems to be bullish on the $657.16B market cap company. The stock decreased 2.43% or $33.49 during the last trading session, reaching $1343.96. About 7.22M shares traded or 0.75% up from the average. Amazon.com, Inc. (NASDAQ:AMZN) has risen 41.49% since December 25, 2017 and is uptrending. It has outperformed by 41.49% the S&P500. Some Historical AMZN News: 09/05/2018 – Amazon is working with Lennar to demo model homes that can be controlled by Alexa; 18/04/2018 – Amazon and Best Buy are teaming up to sell Amazon’s new Fire TV Edition smart TVs; 02/04/2018 – As Amazon struggles to crack markets in Asia, this Korean Unicorn could be a strong candidate for an IPO in 2019; 02/04/2018 – As Race to Become Korea’s Amazon Heats Up, E-Mart Selling Bonds; 13/04/2018 – Post office rate hike could cost Amazon up to $1.8 billion more per year: Credit Suisse; 07/03/2018 – Amazon admits Alexa is creepily laughing at people and is working on a fix. via @circuitbreaker; 02/04/2018 – Netflix, Airbnb, Slack, Time, and Reddit use Amazon’s cloud platform; 16/04/2018 – New York Post: Amazon warehouse workers pee into bottles to avoid wasting time: undercover investigator; 10/05/2018 – Amazon Stops Buying High-revenue Competitive Shopping Ads On Google: Report — MarketWatch; 03/04/2018 – Amazon builds tech’s largest in-house lobbying team

And here I am telling the tale, one reason I snort whenever the momma’s kiddies post their “safety warning” comments on HaD.

仲鑫达以“专业、 诚信、创新、合作、共赢”的经营理念、不断开发新产品、为客户提供优质服务、以最大限度追求客户满意、并不断开拓新领域业务。