Estimation and Costing Earthing Practices

What should be the cross section of the earth continuity conductor?

1
Should not be either less than 2.9 mm2 or same of the installation conductor size.
2
Should not be either less than 1.9 mm2 or half of the installation conductor size.
3
Should not be either less than 2.9 mm2 or half of the installation conductor size.
4
Should not be either less than 1.9 mm2 or same of the installation conductor size.

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