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TELECOMMUNICATIONS - NUMBER OF CABLES ALLOWED IN A CONDUIT OR PIPE ?

 

The maximum number of cables enclosed in a conduit or pipe should be such that will permit the installation of cable without damage. As a guide the table below will help you out.

The table applies to conduits or pipe runs which do not exceed 12 metres in lenght and where the cables are not drawn around more that 2 x 90 degree bends.

 

 

 

Where earth cables are being installed in conduits or pipes with telecommunications cables it should for the pupose of identifying the required conduit diameter, the earth wire be regarded as another telecommunications cable of equal size.

Conduit and Duct Systems.
When installing conduits and or ducting systems, it is important to use good engineering practices, these are:-

1. Mechanical continuity should be maintained through all joints in metallic ducts and conduits. If flexiable conduit is used for any reason earthing between sections must be enforced.

2. Conduits installed within indoor applications should contain draw boxes at distances not exceeding 12 metres. If exceeding 12 metres you should use a greater diametre conduit.

3. Rule of thumb is - you should install draw boxes at every 2 lenght section of a straight run conduit run or after every 2 x 90 deegree bends.

4. Both plastic and steel conduits must have sharp edges filed down to a smooth feel.

 
Conduit / Pipe size (mm) 2 Pairs 3 Pairs 6 Pairs 10 Pairs 20 Pairs 35 Pairs 50 Pairs 100 Pairs
20 3 2 1 1        
25 6 4 3 2 1      
32 10 8 4 3 2 1 1  
50         5 3 2 1

 

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This page was last modified on 19 January 2010 and maybe out of date with regards to newer practices at the time of reading this article

 
 
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