STREET PILLARS


In 1945 the advice from a report on the provision of local cable distribution became BPO policy.  The cable distribution network would have main cables terminating in iron cabinets and then local cables radiating from these cabinets to either small pillars or direct to Distribution Points (DP's).

Pillars would in turn terminate the cable from the Cabinet and local cables would radiate to the Distribution Points.  These DP's were effectively the end of the external plant distribution and can be found on on poles, building walls and inside customers premises.

Pillars were already in use in Australia and the BPO adopted the same principle albeit a slightly different termination design.

After the 1970's, Pillars were dropped and Cabinets were just used as the main distribution mechanism. 

The Cabinets and Pillars afforded flexibility in the network as any incoming wire could be connected to any outgoing wire.   The connection made by a piece of two wire called a "jumper wire".  In the early Pillars and Cabinets the terminals were actually screws which clamped the jumper wire or in the case of a through connection (i.e. incoming wire 10 to outgoing wire 10) then two metal pins were used (See picture to the right for the early model).

In the early 1970's plastic formers were used for new work, instead of the screw style terminal blocks and the cable wires just pushed through numbered holes and were left hanging.  Connection was made with crimps (See picture below).

The Pillar has five effective parts:-

  1. Base
  2. Terminal strip
  3. Moisture cover
  4. Outer cover
  5. Cover fixing bolt

The base had a 90 degree pipe leading from it through which the incoming and out going cables were fed.  The cables were  pre-terminated on the terminal blocks and jointed to the local cables a small distance away.

Due to being out in the open, the wiring and terminal block were then covered with a metal moisture sleeve which had a rubber gasket at the bottom.  Originally, desiccant was also left inside the Pillar, but was later discontinued.

The outer cover was then put in place and a long bolt went through the base, which secured the cover.

The original outer covers were made of asbestos cement.  This material was rather fragile and the covers were later made of steel.

Pillar with later crimped connectors (Yorkshire Area)
The mounting is called a Strips Connection No. 1


Strips Connection No. 1 showing layout and numbering


Later style steel cover
Note - Clamp is missing


In the above picture the terminal screws can be clearly seen.
In front of the Pillar is the cover clamp.

 

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: March 21, 2021

FM2