An electro-optic device comprises a first substrate having a rear surface and a second substrate having a front surface opposed to the rear surface of the first surface; a cavity defined between the opposed rear surface of the first substrate and the front surface of the second substrate; a sealing member bonding first substrate and second substrate together in a spaced apart relationship; and a bi-level bus bar assembly comprising a first layer and a second layer, and disposed between the first and second substrates. The bi-level bus bar assembly extends along at least a portion of a perimeter of the electro-optic device.