Boundary condition for perfect electric conductors

please tell me which type of boundary condition we need to apply for a Perfect electric boundary.

\vec{n} \times \vec{E} = \vec{0}, where \vec{n} is the outward pointing unit normal of the domain and \vec{E} is the electric field vector.

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How to implement it on fenics as Dirichlet boundary condition .

E.g. here.

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