I’ve been shocked a few times. First time, a friend and I were changing out outlets in a room in his house. He shut off the breaker for the room, and I watched him plug a lamp in and test it. I found out the HARD way, that each side of the room was ran through a different breaker… I got a quick jolt and the gerber tool I was using catapulted across the room…
1. Metal-oxide varistors (MOVs) are available in a variety of form factors and sizes for a broad range of applications. The radial leaded disc type is the most common version.
Westinghouse（西屋）： OVATION系统、WDPF系统、MAX1000系统备件Invensys Foxboro（福克斯波罗）：I/A Series系统，FBM（现场输入/输出模块）顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
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.)
As an electrician (among many other things), I cringe when I see people acting like line voltage is nothing to worry about. I’ve seen photos and video of people who died gruesome deaths because they either failed to take the proper precautions or had no idea what they were doing when handling line power. I spent years training to safely handle electricity, and then spent another 15 years working with it in industrial, commercial, and residential settings. Despite all of this experience, I still have a healthy respect for electricity, which has probably saved my life on more than one occasion.
The Sony A33 offers a lot of control for shooting contrasty subjects. Dynamic Range Optimizer (DRO) adjusts contrast and brightness to optimize the camera’s use of available dynamic range. Auto HDR modes use three quick shots to cover an amazing tonal range. (The shot on the right represents the maximum range of 6 EV.)
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
A residual current circuit breaker. Jimbob82 [Public domain], via Wikimedia CommonsA residual current circuit breaker compares the current flowing in the live mains conductor with that flowing in the neutral. In a normal situation these currents will be identical as current flowing out one must flow back in the other. If they differ, it is likely that the missing current is due to a hazard or fault, and the circuit breaker is activated. So if the power shorts to earth through your body rather than the normal return path, it is detected and cut off. It is important to understand that a residual current circuit breaker will not protect you from circuits on the other side of an isolation transformer, however this is to provide some protection for the other circuits on your bench. You may well find that the wiring codes in your country mean you already have a residual current circuit breaker in place.
In the second week, I’m not even sure why I did it, I was working on a pinball machine and measured 240V between the chrome plates on the front of the 2 pinball machines to either side of the one I was working on. The electrician had “forgotten” to hook any of the earths for the whole building.
Operating temperatures are another consideration. Assume the ambient operating temperature for this application ranged from 0 to +70°C. This would be within the MOVâs -40 to +85°C rating, and there would be no requirement for derating of surge current or energy across this temperature range.Taking high-line tolerance into account, a 275-V ac-rated MOV may be chosen for this example. Using a 2-hp, single-phase, medium-sized motor, the MOVâs required surge-current rating would be determined by the peak current induced at the motor supply. Assuming a service location for the motor and a line impedance of 2 Ω, it was determined that a 3-kA lightning surge was possible. In this case, one datasheet indicates a maximum clamping voltage of 3 kA at 900 V, which is below the 918-V suggested stator-winding withstand capability. If the motorâs operational life were estimated to be 20 years and specified as being able to withstand 80 lightning transients during term of service, the datasheet pulse-rating curves would verify a rating of 100+ surges.
Electricity can and will kill you. dead. it doesn’t care if it’s dumping into you from an AC or DC source or at what frequency. A little tickle to one person may be the correct amount at the right time to drop another who has a heart defect they didn’t and will never know they had. “Freezing on circuit” and all the other bullshit people wax on about is meaningless when you are dead. And electricity will grab you and tear out your soul before you have a chance to fucking realize you are dead. If you honestly don’t know what you are doing, then shut the fuck up and stay the hell back. A dead “know it all” knows nothing. Turn off your fucking ego because it’s going to get you killed. Period. Use common sense to keep yourself alive, if you have none, stay the fuck away from electricity.
Engineering types have been known to reduce “Preventive Maintenance” in the large “Mains” switch panels in an attempt to save budget funding. A close friend stepped up to a sadly neglected switch panel, pushed the dis-connect and the panel door blew off in his face. It seems that dust is conductive, and will explode if a large spark is present. The good news, he is alive, and was promoted to avoid a lawsuit. :cheers:
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