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Earth Bonding Symbol Question

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Leeima:
Can anyone explain these symbols to me?




there's the earth/ground symbol in three variations (that I know) "white on green", "black on yellow", and "white on blue"

I know that white on blue labels usually indicate mandatory, but what I couldn't figure out if that meant it was already bonded to earth, or I needed to provide an external earth connection to it.
It's a label I have on a rackmount PDU.

Ideally I'd use that point as my earth point, and the rest of my earth would be tied to that, but if that is not the case then I would need to get access to the earth from the main cable plugge din

mendip_discovery:
https://incompliancemag.com/article/the-grounding-symbols/

Colour seems irrelevant but the symbols to differ.

AVGresponding:
Generally they are chosen to have good contrast with the background they are to be affixed to. There is no significance beyond that.

Leeima:
Thanks, I thought there may be some obscure wiring regulation denoting the different colour combinations

Benta:
Only the green symbol has a standardised meaning.
Not because it's green, but because there's a circle around it.
This is internationally recognized as "Protective Earth", short: PE.
The two other symbols are arbitrary and can mean anything, depending on manufacturer and location.

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