This statment is incorrect.Fusing and breakers between 120v RMS AC and 120v DC are the same.
AC or DC discussion is not subject of the N.E.C.Interesting. Section 240 ("Overcurrent Protection") of the 2008 NEC makes no specific mention of such derating for DC.
At the beginning of Section 240, search for "DC", whole word results only. Nothing comes up about a derating requirement for AC vs DC.
http://www.garnernc.gov/Publications/Inspections/2008 National Electrical Code.pdf
The only match for "DC" in section 240 has nothing to do with this:
240.15 Ungrounded Conductors.
(B) Circuit Breaker as Overcurrent Device
(2) Grounded Single-Phase and 3-Wire dc Circuits. In grounded systems, individual single-pole circuit breakers with identified handle ties shall be permitted as the protection for each ungrounded conductor for line-to-line connected loads for single-phase circuits or 3-wire, directcurrent circuits.
The abbreviation "D.C." with periods is not used in the code.
The word "direct" does not appear in section 240.
The NEC codes, while valuable are not the last word on electrical power circuit design. DC power is an area where little is in code but the 2012 -> 2014 versions will have updates due to Solar Energy systems becoming widespread and common.Interesting. Section 240 ("Overcurrent Protection") of the 2008 NEC makes no specific mention of such derating for DC.
At the beginning of Section 240, search for "DC", whole word results only. Nothing comes up about a derating requirement for AC vs DC.
http://www.garnernc.gov/Publications/Inspections/2008 National Electrical Code.pdf
Your analogy does not mean anything to me.It's kinda why use $1000 for an experiment or to proove a point when you can for $10.
And why use 20pcs. of a component when one is sufficient.
All of the effects that happen at high wattage happen at lower wattage (arcing, ...) the magnitudes are different but the effect of DC arcing of not opening a circuit during a fault when a breaker designed for 120 AC is used in a 120 DC circuit are then same. DC or AC/DC rated breakers are different from the general power panel types you see at the big box store. The arc will sustain about 1v/mm above 50VDC when the contacts open unless there is a mechanism (Arc Chute,permanent magnetic elements) to stop the fault current. Once you get voltage levels seen in grid-tie PV systems (600VDC+) it becomes critical to use DC rated devices.From that PDF:
I am not talking about circuit breakers for power plants and transmission lines, or 50,000 watt loads. Those have always been weird and always will be, whether AC or DC. Arc stretching, arc cutting blades, arc puffers, and mineral oil baths are normal for such equipment.
I agree, those household appliances which are primitive enough to not realize they're being run on 120VDC instead of 120VAC aren't going to care much about ripple.high precision, ultra deep filtering, when it's absolutely not needed.
Or we'll see him in the Darwin Awards ceremony.For sure OP will proceed in some way, and will notify AAC forum of the results, maybe including pictures.
Uh, no. The web is full of erroneous knowledge, which you seem bound and determined to add to. That is a unregulated power supply. The term linear power supply refers to the components and how they work to regulate the voltage. A transistor and a op amp are both linear amplifiers, though they do have nonlinear areas. The output of the above power supply is not stable, unless you add a linear voltage regulator. There are also current regulators, something totally different.Search. 15 seconds. Google, Linear power supply
http://www.cnccookbook.com/MTCNCDictLaptoMPG.htm
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