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

*My* electricity is cheap (~$0.065/kW), so that 117 miles would cost about $7.61. Gas in my area is down to about $2.70/gallon, so the total fuel cost for those 253 miles would be about $16. Other areas of the country might be higher for electricity and lower for gas.

For maximum resolution and shooting speed, plus built-in GPS, choose the Sony A55. Give up a little speed and resolution and drop the GPS, though, and you can save upwards of $200 with the Sony A33.

Before we begin, we must begin with an obligatory disclaimer: handling mains voltage can be very dangerous. Do not do so unless you are qualified! You could burn your house down. (Without the lemons.) That being said, [TJ] has created an interesting dev board for controlling mains voltage over WiFi with the now-ubiquitous ESP8266 module. At only 50mm x 25mm, it is easily small enough to fit inside a junction box!

Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的最现代化的容错控制器。

A 40G HWH uses 3000W elements. Constant draw is 12.5A@240V and requires a 20A breaker (max draw / 80% safety margin = 15.6A so round up to 20A). 60G uses 4500W or 18.75A@240V and requires a 30A breaker (23.4A @ 80% safety margin so round up).

You can get special ground fault detection switches. The circuit at the output of the isolation transformer should be floating with respect to ground. When they detect an impedance between that circuit and ground below some configurable threshold (sometime 5Mohm) they will switch off the power.

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A blocked or dirty air condenser can also degrade the performance of your unit. Make sure the vents around your air conditioner are clear of debris and the area surrounding your A/C unit provides plenty of air flow.

Oh well… That industrial relay has ‘almost’ the same contact ratings of a simple songle srd-05v sl-c relay (specifically the C form/single phase). But I’m sure it won’t last as long as 20y+ in such harsh environment.

I suppose I would’ve used small contactors with auxiliary contacts as interlocking instead through some sort of arrangement, but that’s only because I have a pile of them lying around (and you would just put the wires under terminals rather than QD’s) but as I said (and you reinforced) I trusted your QD’s, particularly at these…”small” levels of current.

Clearing the work space and moving any furniture before I arrive means I can get in and out faster, so I can charge you for less of my time.

I play around w/ HV/low amperage PSUs all the time, that stuff will make you lose control of your muscles…