An electrical distribution board comprising: at least one incoming conductor terminal; at least one outgoing conductor terminal; at least one longitudinal bus conductor connected to the at least one incoming conductor terminal; at least one lateral conductor tab connected to the at least one bus conductor for distributing electrical power from the at least one bus conductor to the at least one outgoing conductor terminal; and at least one isolation mechanism arranged to electrically isolate the at least one outgoing conductor terminal from the at least one lateral conductor tab, the at least one isolation mechanism being moveable between a first position in which the at least one outgoing conductor terminal is electrically isolated from the at least one lateral conductor tab and a second position in which the at least one outgoing conductor terminal is electrically connected to the at least one lateral conductor tab, characterized in that the at least one isolation mechanism is configured to be engageable with a housing of the electrical distribution board when the at least one isolation mechanism is in the first position, such that movement of the at least one isolation mechanism from the first position to the second position is only possible once the at least one isolation mechanism has been disengaged from the housing of the electrical distribution board and in that the at least one isolation mechanism is also configured to be engageable with the housing of the electrical distribution board when the at least one isolation mechanism is in the second position such that movement of the at least one isolation mechanism from the second position to the first position is only permitted once the at least one isolation mechanism has been disengaged from the housing of the electrical distribution board. at least one incoming conductor terminal; at least one outgoing conductor terminal; at least one longitudinal bus conductor connected to the at least one incoming conductor terminal; at least one lateral conductor tab connected to the at least one bus conductor for distributing electrical power from the at least one bus conductor to the at least one outgoing conductor terminal; and at least one isolation mechanism arranged to electrically isolate the at least one outgoing conductor terminal from the at least one lateral conductor tab, the at least one isolation mechanism being moveable between a first position in which the at least one outgoing conductor terminal is electrically isolated from the at least one lateral conductor tab and a second position in which the at least one outgoing conductor terminal is electrically connected to the at least one lateral conductor tab, characterized in that the at least one isolation mechanism is configured to be engageable with a housing of the electrical distribution board when the at least one isolation mechanism is in the first position, such that movement of the at least one isolation mechanism from the first position to the second position is only possible once the at least one isolation mechanism has been disengaged from the housing of the electrical distribution board and in that the at least one isolation mechanism is also configured to be engageable with the housing of the electrical distribution board when the at least one isolation mechanism is in the second position such that movement of the at least one isolation mechanism from the second position to the first position is only permitted once the at least one isolation mechanism has been disengaged from the housing of the electrical distribution board.