What is the maximum sidewall pressure (SWP) for cable installation?




1. Definition 
- SWP refers to the pressure exerted on the side walls of a conduit or duct when a cable is being pulled around a bend or through a roller. 
- Exceeding the maximum SWP can damage the cable's insulation and structure, leading to performance issues and reduced lifespan. 

2. SWP Formula 
The maximum side wall pressure is calculated using the formula:

SWP = F / R 

Where: 
- F = Pulling force (in kg) 
- R = Bend radius (in m) 

3. Maximum Recommended SWP Values 
- Buried installation (rollers placed close): 500 kg/m 
- Duct installation: 750 kg/m 

4. Notes 
- The maximum SWP values depend on cable design and installation conditions. 
- In some cases, higher SWP values may be acceptable depending on the cable's structural properties.