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For a TRIAC I bend the middle pin forward 0.1″ – 0.2″, this is often done commercially and you can even buy them pre-bent.

It calls out a MOC3041M on the silkscreening. One can use a MOC3041 of course as they are the same form factor.

In my experience there are only TRIACs that are in perfect working order or TRIACs that have exploded.

The Sony A33 uses the image sensor itself when metering, and considers the overall image as 1,200 separate zones in performing metering calculations. Metering modes include Multi-segment, Center-weighted, and Spot, and the metering system can function from -2 EV to +17 EV (at ISO 100 equivalent with an F1.4 lens). An autoexposure lock button is provided, allowing metering to be locked from a specific portion of the subject, then the overall image reframed as desired. +/-2.0 EV of exposure compensation is available, in 1/3 EV steps. The A33 also offers a three-frame exposure bracketing function, which allows a step size of either 1/3 or 2/3 EV between subsequent frames. Shutter speeds from 1/4,000 to 30 seconds are available, as well as a bulb position that holds the shutter open for as long as the shutter release is pressed. Flash X-sync is at 1/160 second. White balance options include auto, six presets (Daylight, Shade, Cloudy, Incandescent, Fluorescent, and Flash), plus both custom and direct color temperature (2,500 to 9,900K) options. The six presets allow +/- 3 step adjustment, and there’s also a color filter setting that provides +/-9 steps of magenta / green compensation.

In the old days, waaay back in the 20th Century, you’d buy something from a vendor that had a good reputation. It was in their interest to keep their reputation, because that’s where customers came from, so they’d make sure to only buy their materials and parts from reputable suppliers. And they’d do the same, forming a chain of reliability and trust built up through experience and everyone’s mutual need to keep up a reputation.

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– Use isolated differential probes to measure high voltage. – Use current clamps or current transformers to measure current. – Put bleeding resistors in any big capacitor in your circuit. – Don’t change the position of the probes in the power circuit without power everything down. – Don’t work with high voltages alone. – If there’s more people involved in your experiment, block any circuit breaker, button or at least put some signs to prevent people from turning them on while you are messing with the circuit. Paranoids may even ground things while they are playing with the installation to direct the current to the ground in case someone makes a mistake.

This is true in a certain temperature range, I think between 70 and 90% of their nominal power. And in spite of that there are so many lamps with halogen bulbs, which are fitted with dimmer circuits. And you know why? Because the bulbs are very cheap, so nobody cares And they are often used as heating elements: in a professional reflow oven (3000,- euro class) and in laser printers. But in the end I think for the heated print bed you do NOT want a radiative heat source, it complicates the things

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The IEC61010 category ratings on an Agilent multimeter. Medvedev [CC BY-SA 3.0], via Wikimedia CommonsYour instruments such as multimeters, oscilloscopes, and their probes will all carry an appropriate safety rating for maximum voltage, surge voltage, and current. In modern equipment this will be denoted by specified classes each with their associated voltage defined under IEC 61010, though you may find older equipment with IEC348 or other national standard ratings (Fluke publishes a handy PDF explaining these standards in detail if you would like to know more). These ratings are important in ensuring that the instrument keeps you safe as you use it.

NEC article 440 was added because air conditioning and refrigeration systems are different from typical loads, like lights and heaters. Air conditioner compressor and fan motors are largely inductive (magnetic) loads and have different characteristics than purely resistive circuits. Article 440 has specific guidelines for HVAC and refrigeration equipment manufacturers to follow when writing the equipment data tags as well as for electricians when sizing conductors.

I suppose if you want, you can stick your fingers into the toaster slot to touch the exposed element and push down the slider or try to make toast while taking a bath. Otherwise, you are not making any contacts with the high voltage.