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Electric symbols

Electric symbols

Electric symbols

(OP)
I received an electric single line diagram drawn in USA where it appears two small circles close to a low voltage circuit breaker. Inside one circle is written EO. Inside the other, DO. What do they mean?
Thanks.

RE: Electric symbols

EO could be "electrically operated"
DO could be "draw-out"

If you post an image of the actual drawing, it might help.

 

RE: Electric symbols


I could never understand why the IEC is unable to standardize electric symbols. Even worse is the fact that in a library you have to bend your neck left and right to recognise book titles.

Wolf

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