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Motor Nameplate Current vs. NEC Full Load Current Values | National Electrical Code | 25 Amp Circuit Breaker

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A good quality EVSE can cost between $300 and around $1,200. If you’re choosing a wall-mounted unit, expect to pay another several hundred dollars for installation, depending on local labor rates and permit costs.

Just three months after launching the NEX-3 and NEX-5 single-lens direct-view (SLD) cameras, Sony offers up yet another interchangeable lens alternative to the traditional DSLR, with the Alpha SLT-A33, and its closely-related sibling the SLT-A55. Instead of being mirrorless, the new digital cameras employ a "translucent mirror," more commonly known as a pellicle mirror. This advanced translucent mirror remains fixed in place during operation, allowing most of the light to reach the imaging sensor, while a small percentage is reflected to a dedicated autofocus sensor.

They do not connect 240VAC , they connect 24v DC with a 15A source. Remeber AC is a sine signal, you don’t want a signal that turn off 60 or 50 times per second.

Of course, after buying a 1000W PSU, I kept getting intermittent shutdowns and freezes after 30-60 minutes of gameplay or CAD work, despite remaining perfectly stable while mining for days at a time. The GTX670 has no backplate and last year a fan screw vibrated loose and fell on top of it while everything was running. The motherboard was toast so I ungraded it and the CPU (AMD FX9590), but the GTX670 itself seemed okay. Apparently not.

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Ahh, my late, late night read of the datasheet for the MOC3041M, which the schematic initially? called out but then was changed to a MOC3041 had the mains load being carried by the MOC3041/M triac, not the BT137 triac. Good catch. The triac should still be able to handle 15 amps, not just 8. And I agree, I don’t see any heatsinking.

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.)

Low current (and damage-reducing high-frequency skin effect) on the Tesla coil’s HV secondary. Mains frequency penetration, arcability and cross-heart lethal current on the neon sign transformer’s secondary. So, it’s good that my wakeup call went in & out of the same arm.

In cases of energy shortfall, we could apply 3% or 6% voltage reduction from our central control, to shed load. (along with asking manufacturers to reduce load, part of their contract) Before real load shedding, switching off supplies. I know. I was a control engineer. Admittedly a few years ago :)

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I’ve also experienced very similar shocks, mains flowing from one hand to another by trusting my co-worker. I couldn’t move my arms and upper body, couldn’t scream, breathe or even see during the shock. I don’t know how long it lasted and there was nobody nearby. Luckily my brain and lower body was still partially functional and I somehow managed to kick the wall in front of the, to disconnect myself from live connections. Some of my fingertips were smoking. I learned my lesson as well – never trust anyone, especially if they are repeatedly assures you that the power is down.

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.

All of these ratings can be found in NEC (NFPA 70) Table 310.15(B)(16) in detail, but as an example, according to this NEC chart, a 6-gauge copper circuit rated at 90°C (194°F) has an ampacity of 75 amps while a 6-gauge aluminum conductor rated at 60°C (140°F) has an ampacity of 40 amps. Of course, there are other considerations in addition to this, but it is clear the rules of thumb we often use can get us in trouble if we aren’t aware that exceptions exist and what those exceptions are.

At least in the US/Canada/Japan, when you buy an appliance, it comes with a standard (NEMA5 or NEMA1) plug. In Europe and Africa (at least up to a decade or two ago) we often needed to purchase a *plug* every time we bought a device, and play amateur electrician and wire it ourselves (is this still the case?). I’m convinced this is a big reason the horrible standard IEC power entry connector and locale-specific cord even exist.


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