110 volt and 12 volt on the same switch? - Page 4 - Fiberglass RV


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Old 04-04-2013, 12:41 PM   #43
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Raz, DC loads are much more difficult to break. They never cross zero, so the current interrupting capacity must be de-rated for a switch that is designed for AC. As noted by others, there are switches that work for both, but are typically rated lower in a DC service.
And in the same vein, is the effect of getting shocks. (I know, going off track here ) I have had lots of shocks from 120 AC, and though it hurts a bit, it is easy to pull away from as the current alternates past zero. I have had a couple shocks from 130 DC (used as control voltage for equipment in electrical substations), and holy crap does that hurt, it feels like getting hit in your whole arm at one time, and being a constant current, it does not let go as easily.

Anyhoo, back to your normal programming.
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Old 04-04-2013, 01:23 PM   #44
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It always ceases to amaze me how those who know everything take 3 pages to agree on a single thing.
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Hey Mr. Language Person!

Is "always ceases to amaze" what happens at some point after a certain something "never fails to amaze"?

Francesca
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Old 04-04-2013, 02:13 PM   #45
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Hey Mr. Language Person!

Is "always ceases to amaze" what happens at some point after a certain something "never fails to amaze"?

Francesca
I think it is that sarcasm thing again.
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Old 04-04-2013, 02:34 PM   #46
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A shocking response

The only way to equate AC and DC is through power dissipation. A 120 VDC source will heat a resistive load to the same temperature as a 120 VAC rms source. While not a resistive load you are close enough and as such will cook to the same temperature with either source applied after an equal amount of time.

As to the disruption of your nervous system caused by each source, I am skeptical that the 8.33 millisecond zero crossing event of the AC source will prove to be advantageous in getting free but will be more that glad to review any data experimentally gathered. Raz
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Old 04-04-2013, 02:36 PM   #47
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Hey Schoolmistress, whassup? You arrived a few pages in so you have a right to catch up but I swear it's a blessed relief when some of these stemwinders do finally go completely off topic! It's a switch anyway, har har har.

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