Difference between revisions of "Common symbols around you"
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| − | <br style="clear:both">[[Image:Some transformer symbols.png|thumb|201px|right|isolating, safety isolating | + | <br style="clear:both">[[Image:Some transformer symbols.png|thumb|201px|right|Transformer (general)<br/><br/> |
| − | Double circle (looks like venn diagram) - a few variants, indicating isolating, safety isolating, separating, and fail-safe variants of transformers. There are more combinations of all the parts | + | isolating, safety isolating; non-short-circuit proof, short-circuit proof<br/><br/>separating transformer, output >1kV, variable, constant voltage, perturbation attenuating]] |
| + | Double circle (looks like venn diagram) - a few variants, indicating isolating, safety isolating, separating, and fail-safe variants of transformers. There are more combinations of all the parts this image shows, and others (e.g. construction site). | ||
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Revision as of 14:51, 9 November 2019
Uses, safety
Indoor use only
double insulated, a.k.a. Class II
Dispose as electronics
Switch-mode, Linear, general/unspecified power supply
Hot surface
"Independent lighting auxiliary" [1] roughly meaning "lighting power supply not built into the luminaire"
Power supply
The top symbol is for DC barrel plugs, specifying whether the inside or outside is positie.
The middle line is input, where the squiggly tilde ~ indicates AC.
The third line (output)'s solid and dotted line indicates DC.
isolating, safety isolating; non-short-circuit proof, short-circuit proof
separating transformer, output >1kV, variable, constant voltage, perturbation attenuating
Double circle (looks like venn diagram) - a few variants, indicating isolating, safety isolating, separating, and fail-safe variants of transformers. There are more combinations of all the parts this image shows, and others (e.g. construction site).
Certifications
Some of the more commonly seen safety standardizing bodies and their certifications include:
UL (United States)
BSI, also Kitemark (UK)
TUV (Europe and North America)
VDE (Germany)
GS (German/European)
CE (European)
CE (Australian)
PSE (Japan)
You'll note that some of them are country-specific. There are many more country-specific testing centers. You're probably used to the ones applying to your part of the world.
In most places these are not required for sale, but for both safety and insurance reasons they are a good idea for both you and retailers.
For things like power supplies it's not uncommon to see a bunch more certifications,
e.g. when a large company that has locked down the design so that they can mass produce
it for worldwide sale without a lot of new certification.
Often with different, tighter spacing (though some real CE products sometimes do this too for spacing reasons).
Related
A bunch of the above are settled in ISO 7000 / IEC 60417, which also have a lot of markings used around mechanisms, indicatons, and buttons, around cars, audio, production lines.
See https://www.iso.org/obp/ui#iso:pub:PUB400008:en
IP ratings for water and object safety
Unsorted
https://hackaday.com/2018/02/02/what-are-those-hieroglyphics-on-your-laptop-charger/
Consumables
