Electrical Apparatus (100) includes an end of a cable (500) being connected to a transmission optimizer (20), and the cable (500) conducts a current in the range of 0.01 mA to 800 A at a voltage ranges from 12V to 140 KV for the transmission of power, data and signal. The cable (500) includes at least one insulated conductor core formed with an innermost insulating layer (220) disposing around the outside of a conducting layer (210) having carbon fibre or graphite fibre as a conductor core (210). The cable (500) includes a single insulated conductor core to form a single-core cable (300). A reinforcement layer (250) and or a shielding layer (230), (232) being provided around the outside of the innermost insulating layer (220). An outer insulating layer (240) disposes around the outside of the reinforcement layer (250) and the shielding layer. The cable (500) includes multiple numbers of single insulated conductor core to form a multi-core cable (400). A certain number of the multiple numbers can be loaded together to form as a group by a wrapping layer (260) with a screen material in tape form and or a binder tape. An inner jacketing (225) is provided around the outside of the wrapping layer (260). A shielding layer (230) (232) and or an reinforcement layer (250) being provided in between the inner jacketing (225) and the outer jacketing (240″).