...
However it is to note that if the centre CB is out of service for any reason, the feeds must be operated independently with the consequential risk that a fault on one of the connection points (e.g. a cable fault to the right) would prevent that side connecting.
4-CB Ring Bus as Partial 2 x 1.5 CB Diameter
...
(The similarity of the bus layout here for two CBs in each diameter to the 3-CB Mesh connection of a single feed should be noted as a path for augmentation from single feed to double feed connections.)
Key
