regarding protectice and instrument earth

[Rajan Shakti]

hi all
i have a doubt regarding protective earth and instrument earth .i had a screen cable which is terminated inside jb and from there that 4 sq mm wire going back to the instrument earth bar,there is one more protective earth lug which is present in equipment where should i terminate that wire and where i should terminate the braided wire which can be linked outside of the cable gland via earth lug,can anyone help me regarding that,whether instrument and protective earth need to be isolated ??
i am putting a pic how i did if it is a wrong wiring practice kindly sugggest

 

[malcolmsanford]

hi all
i have a doubt regarding protective earth and instrument earth . Looking at your drawing I think these are one of the same thing. There is protective earth and functional earthing, used a lot in IT systems which by the look of your drawing both bars are protective earths

i had a screen cable which is terminated inside jb and from there that 4 sq mm wire going back to the instrument earth bar, In you mind which is this instrument earth bar? Is it bar you labeled no 1? Where is this screened cable your drawing is only showing the Yellow/Green cables. which are earths.

there is one more protective earth lug which is present in equipment where should i terminate that wire For me that should go back to bar No 1, but to be honest your drawing is so vague

and where i should terminate the braided wire which can be linked outside of the cable gland via earth lug,Bar ! again I think
can anyone help me regarding that,whether instrument and protective earth need to be isolated ?? No by the look of your drawing they are both the same thing
i am putting a pic how i did if it is a wrong wiring practice kindly sugggest

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[Rajan Shakti]

actually the drawing is of wrong wiring practice i need to improve that,i have a doubt the instrument earth and protective earth should be separated.
screen cable is terminated inside the terminal from there it is connected inside earth lug,
what my doubt is the protective earth cable which is generally present in the body of equipment whether it needs to be terminated at instrument earth or protective earth provided two separate earth bars

and thank you so much for above reply

and can you suggest more drawing tools where i can draw well.

 

[malcolmsanford]

For bigger drawings I use Cad, if it's a small drawing then maybe Visio