The automatic equipment, comprising the basic units, linefinders, group selectors and final selectors, follows public exchange practice, as far as applicable, and is mounted on open-type racks. 2000-type selectors are now standard. 4000-type selectors have been provided at certain installations and may continue to be used until stocks are exhausted. The circuits, components and facilities are standard, but the equipment arrangements may vary to a small extent between manufacturers and may also be adjusted, if necessary, to meet the needs of a particular installation. The manual switchboard, which is of the cord type with an extensive multiple, in the general case consists of Sections, Switch, P.B.X., SA 7560 arranged for 50 volt working. Larger switchboards are used when necessary to provide additional multiple space.
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