Curious What $750 Gets You? Pics of the Guts of Nissan LEAF’s Charge Station | 220v Contactor Relay

One of the most important rules ever: “Never underestimate your own stupidity.” Knowing perfectly well how to safely power down a circuit / appliance / machine is sadly not sufficient to actually do it, especially so if it has become a repetitive task and there are elements of distraction. If ones life is at stake, there should be check-lists written in stone, just like in aviation.

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This is great info. In the next instalments I would love to see advice in dealing with a mains power supply and possibly a power line carrier modem on the same board or enclosure as low voltage components.

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Then when you step up a notch to the KV stage the safety rules change because air can now be a conductor.

I have never seem a ‘cooked’ TRIAC or a TRIAC that is not working properly unless it has exploded.

In some cases, contractors have stated that certain municipalities are requiring that conductors be sized based on the breaker size instead of the MCA. This is not uncommon, but it is usually a matter of a respectful conversation about the above NEC articles. The “authority having jurisdiction” or AHJ is responsible for interpreting the code, and they can make any standard they see fit. While certain local legislation may supersede the NEC with additional regulations, the NEC is a nationally recognized standard throughout the U.S. It is rare that a building department will ignore entire articles of the NEC when it is brought to their attention in a respectful manner.

Heating is a function of power loss, which varies by the square of the voltage drop and inversely with the resistance. Current is a fallout of the voltage drop across the resistance. While typically stated as I*I*R losses, getting that “I” to be a big number with a low input voltage means that R has to also be low, which decreases power. Requiring a low R for the heating element magnifies the power losses in the rest of the circuit, where heat isn’t desired.

I’ve been bit in a big way only three times. Two of the three were “Trust but don’t verify” issues, and I learned from them – always verify, no matter what anyone says.

Depends how far north you are – direct sunlight isn’t required for them to produce useful heat. If you’ve got a months long night then they’re no use though.

Maybe they’re at the same kind of place Rubicon were during the capacitor plague, actually made by Rubicon caps were okay, exact visual copy fakes and Rulicons, Rubicows Rubycoms etc etc were not

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