As explained elsewhere here, a major point of the Sony A33/55′s translucent mirror technology is to permit autofocus operation and image exposure to overlap each other, enabling very fast continuous burst shooting with accurate autofocus tracking. They in fact do a remarkable job of delivering 7fps or 10fps full-resolution shooting speeds, although in some respects, the experience is still rather different than shooting with high-end pro SLRs with that sort of burst capability. The heart of the difference has to do with what image the Sony A33 is showing you through the viewfinder at any given moment.
Oversizing switching gear is good to some point but instead of relay withstanding surges I would prefer breaker that would protect everything.
The skin depth varies with the magnetic permeability of the material. Iron for example reacts at very low frequencies, so much so that it becomes useless for wires at 50 Hz.
By not distributing the three wires and only distributing two you try to limit the possible potential between neutral at the sub and neutral at the house by using multiple earths anywhere you can so in this case when lightning strikes the local ground potential rise applies to the ground and to the local end of the neutral/earth wire. Massive currents may flow through that neutral/ground and eventually through the low value resistor at the substation but under no circumstance other than network failure is it possible to get a neutral ground potential of significance with a premise. The low value resistor at the sub limits the current to one that the network can handle.
CARLO GAVAZZI is proud to announce the launch of the newest addition to its RGC Series Solid State Contactor platform. These single-phase zero-crossing relays, featuring an integral heat sink, offer the best in the class current rating of up to 37AAC at 40°C or 43AAC at 25°C.
LOL– I stepped into doo-doo deep enough to over top chest waders, I’m over six feet tall, so that’s deep doo-doo. First I was surprise to learn that the heated beds weren’t heated by line voltage, IMO that’s a no brainer. Appliances across the word use line voltage to produce heat with no shock hazard present when use properly. Getting back to the deep doo-doo. Hackaday does present instruction posts. Line voltage is useful resource that is avoided because of irrational fear. I’m calling irrational because the fear is due to ignorance. I suggest Hackaday create instructional post on how to use line voltage in a way that’s safe to life and doesn’t cause property damage when something goes wrong. Peer reviewed studies and guidelines information is preferred.
If you do not know the exact value of each cost, you could enter an estimated percentage based on the cost of goods.
I flashed Tasmota firmware onto the Sonoff, and configured GPIO2 as a counter, and I now have the whole setup reporting to Node Red, which switches the pumps on and off on schedule, or as desired. I’m quite chuffed with the result, although now I need to learn a lot more about how Node Red works! 
Continuing USWaterRockets: PCB could just have the solder mask on, mostly for oxidation/contamination protection, with the heating element trace a single top layer. Put a plate of borosilicate glass (maybe tempered?) tightly over it to spread heat and protect from shock, with overhang on the hazard side. If you want to get fancy, add an “active” indicator LED and a few thermal sensors on the bottom layer. Mind your PCB glass mat material and construction – make sure that the construction can handle the heat (a good [not great, not cheap] construction can handle ~170C before it reaches glass transition temperature)
As an engineer over 20 years ago I coined the term Beancounter Engineering this kind of stuff where some Idiot MBA sets the specs based on saving a few pennies rather than a Electrical Engineer that understands basic (and complex) science. If you are too damned stupid to understand the basic science behind Global Warming you have no business being an engineer or telling engineers what to do
Why do the US still use 110v mains and 20A room circuit breakers? Those currents are dangerous, not the volts.
Arc-Fault Circuit Interrupter (AFCI) circuit breakers run warm. This is normal, there’s nothing to report here.
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