A distribution board (additionally known as panelboard, breaker panel, or electric powered panel) is a part of an strength supply system that divides an electrical energy feed into subsidiary circuits, at the same time as presenting a protective fuse or circuit breaker for every circuit in a not unusual enclosure. Normally, a first-rate switch, and in current boards, one or greater residual-modern devices (RCD) or residual contemporary breakers with overcurrent protection (RCBO), are also integrated.
In North America
In a North American distribution board, the circuit breakers are commonly located in columns. Circuit breaker panelboards are always lifeless the front, this is, the operator of the circuit breakers is not able to contact stay electric components. During servicing of the distribution board itself, though, when the duvet has been eliminated and the cables are visible, North American breaker panelboards normally have some stay parts uncovered.
Illustration of breaker numbering in a North American type panelboard. Some of the labels are missing, and a few lines have extra descriptive labels. The numbers on the togglesindicate the ampereage they may skip before tripping off and disabling all modern-day. The pinnacle proper breaker (Rated at a hundred A) ends in a sub panel.
Breakers are normally arranged in columns. In a U.S.-fashion board, breaker positions are numbered left-to-right, along each row from top to backside. This numbering system is widely wide-spread with severa aggressive manufacturers of breaker panels.
Each row is fed from a one of a kind phase (A, B, and C underneath), to allow 2- or three-pole common-ride breakers to have one pole on each phase. In North America, it is common to wire large completely set up equipment line-to-line. This takes two slots in the panel (two-pole) and offers a voltage of 240 V for break up-phase electric energy, or 208 V for three-phase strength.
The image to the right shows the indoors of a widespread residential provider, North American General Electric style breaker panel. The three strength wires – warm and one neutral – can be visible coming in at the pinnacle. The neutral wire is attached to the impartial busbar to the left with all the white wires, and the opposite two are the recent wires connected to the main breaker. Below it are the two rows of circuit breakers with the circuits’ red and black warm wires leading off. Three wires (warm black, neutral white, and bare ground) may be visible immediately exiting the field and going for walks to a NEMA 5-15 electrical receptacle with a electricity wire plugged into it. The incoming naked stranded ground wire may be visible close to the lowest of the neutral bus bar.