P.A. 350 POLICE SYSTEM
PA350 Police Telephone System
The PA350 Police Telephone System was used in the area covered by the Metropolitan Police in London, UK.
This system, introduced circa 1937, was completely different to that used on the older PA101 and PA150 systems. It was cost effective and technically simplified.
The system used centralised switchboards that covered a pre-defined area with posts and kiosks strategically placed.
The new post/pillars were designated Post PA No. 2 by the General Post Office (GPO) and rented to the Police. Kiosks were owned and installed by the Police force and the GPO would supply the telephone equipment.
The Post PA No. 2 post is sunk into the ground and cemented in place to prevent movement.
When a kiosk was used just the telephone, lantern and Relay-Switch would be required. Click here for a typical Kiosk installation (Drawing PA 364).
In the mid 1950's Police System PA350 was used as the base for a new national standard. To this end the PA450 system was introduced which used the Post PA No. 3. This post was similar to the Post P.A. No. 2, but was produced with thinner cast iron sections and had no underground structure, as it was bolted directly to a concrete base.
The post contained in internal light which was operated by a switch in the middle compartment.
The post had a clear lantern on the roof and there was a press button light test switch in the middle compartment.
There were three doors which were used as follows:-
Drawing - 63209.
Last revised: February 04, 2023