Could A Fire Have Caused The Loss Of MH370? | 25 Amp Circuit Breaker

Like many things, it’s the few psychopaths who spoil it for the rest. For most people, it’s quite possibly an emotional disability.

Most people here only deal with low voltages – domestic mains and below. Where I live even mains voltage is lethal.

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.

No, ebay removed the ability for sellers to leave negative feedback years ago. Fun fact – the majority of an ebay sellers score these days (not the % positive feedback, but the score used for determining search rankings etc) is determined by the % of orders that are received on time and without a ebay ‘case’ (return, etc) being opened.

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.

It’s a 750W pump. Since it is running on 220V, steady current would be ~3.5A, so inrush current could be as high as 20A, according to some sites I’ve just found. Doesn’t sound awesome.

The other advantage is, if your system needs to go into debugging, you can still use the included remote for a manual override. AKA your family won’t kick you out of the house and never let you bring an invention inside again.

Also, when you say “..10A relay will dissipate maximum 2.5W through the 0.1ohm contacts…” also does not seem to be correct: P=R*I^2, so @10A it’s 10W

Handheld Twilight mode captures a batch of high-ISO images, reducing blur from camera shake, and then averages the aligned exposures so as to reduce image noise. A new Multi-Frame NR mode acts similarly, but allows the ISO sensitivity to be selected manually, allowing use even at lower sensitivities. Of course, these effects could all be achieved in a PC with some work and know-how, but what’s impressive is that they’re now available with a minimum of fuss, in-camera. To ensure that even inexperienced photographers can derive benefit from these features, Sony has also created a new Auto+ exposure mode that can identify when these functions might be of use, and then enable them automatically.

Think for a minute, what are you going to find inside that box? You need to consider what voltages it takes as a power supply, what it does with those voltages, where any hazardous voltages might lie inside it, and whether or not they are likely to be accessible once the cover is off. It’s important to realise that simply because an item isn’t mains-powered does not mean you no longer have to consider this, for example if you’ve ever opened a camera with a built-in flash you may have encountered a capacitor with several hundred volts remaining on it. Where is the high voltage going to be?

And keep in mind that EVSEs are a continuous duty device. As such, you need to derate them from the circuit’s rating by 20%. So you should only use 12A on a 15A rated circuit. And you should only do that if you’re confident that there’s nothing else pulling significant current on EITHER circuit besides your EVSE.

I worked in telephony for many years, and the ring voltage can be as high as 180 bolts at various frequencies, but, rather low current. In really old telco systems it may also be a square wave.