Hot circuit breakers and dimmer switches | Lrd12 Overload Relay

While no standard is perfect, I have found that knowing the NEC and looking carefully at manufacturer listings and labels can save you time, your customers money, and help keep everyone safe.   

Actually, some places (notably Australia and the UK) go to 240V, and this is +/- 10%, so theoretically you could be seeing anything up to 264V supplied. However, the supply companies seem to have a “better high than low” philosophy, and my UPS tells me I am currently receiving 257V on a 240V line. I actually believe the UPS, as I’ve regularly seen this happen with test equipment on the line.

I am not going to go right into the above calculations as there are plenty of graphs and tables out the on the net that you can google for. Example – http://electronics.stackexchange.com/questions/22796/creepage-distance-for-pcbs-handling-line-voltage-ac, http://www.smps.us/pcbtracespacing.html

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Australia is similar, except 3ph is uncommon in a house. There’s 3 phase at the kerb and each house is connected to one phase.

Your writing is appreciated. It’s good to learn something more than just the U.S. english terminology for things. Also makes for a better laugh (sometimes) at some of the anecdotes written in the comments that one reads in so many places online.

The operation of the potential relay is based on the increase in back-electro-motive force (back-EMF) or a bucking voltage that is generated across the start winding as the motor increases in speed. The large metal mass of the motor’s rotor turning at high speeds with motor windings in close proximity has a voltage-generating effect.

Xiaomi claims a screen-to-body ratio of 93.4 percent, and has cut down on the “chin” at the bottom of the display by nearly 4.5 millimeters compared to the Mi Mix 2S.

I’ve used 220V heaters to cook meat and I survived (quite well fed) up until now. I suppose heating a piece of plastic can’t be that much more difficult, although wh

In the old days, we were always careful to remind readers to purchase a second battery along with their camera, but in recent years, battery life has become much less of a concern than it once was. Not so with the Sony A33, though: Unless you intend it only for light snap-shooting, consider the purchase of a second battery mandatory.

https://en.wikipedia.org/wiki/Extra-low_voltage >Extra-low voltage (ELV), in electricity supply, is one of several means to protect against electrical shock. The International Electrotechnical Commission and its member organizations define an ELV circuit as one in which the electrical potential of any conductor against earth (ground) is not more than either 25 volts RMS (35 volts peak) for alternating current[inconsistent], or ripple-free 60 volts for direct current under dry conditions.

The first was working with a bench buddy on a military SSB Shortwave amp. My bench buddy assured me he had powered the system down and unplugged everything necessary, and I trusted him. I reached in with a pair of needle nose pliers to remove the plate voltage supply on the amp tube, and got hit by 26kv DC. Shouted and was teleported backwards about 3 feet, but no damage done (except a small melted bit on the end of the pliers).