This paper proposes a new low voltage direct current (LVDC) wiring system design and the modification of conventional residential LED lighting application. Nowadays, the residential lighting system used the supply from the authorized energy supplier to power up all the electrical appliances at home. In Malaysia, the voltage distributed to residential area is 230V AC. The motivation of this study is the application of 12V low voltage direct current (LVDC) can improve the efficiency of performance of electrical appliances that run on DC. As we know, the electrical appliances that driven by DC requires AC/DC converter to operate. But the conversion process of the converter creates losses due to the switching of the device. This study focused on the consideration of wiring design of DC system in residential for LED lighting application especially the size of cable. Maximum number of load than can supports in a point with particular breaker rating is discussed.