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Student1993

Conduit Factors

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Student1993

Afternoon, I am a student studying electrical Instalations, I have an exam coming up in a few days and I'm really struggling understanding conduit factors, I have an onsite guide but the thing that is confusing to me is the numbers of the factors for example: conduit diameter is 16mm and the factor is 290.. what does the 290 stand for?! 

 

I would appreciate any help, thank you. 

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Zeespark

Each size of cable has a conduit Factor, specific to itself, the factors can be found in the OSG.

 

Andy Guinness

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Andy™

the conduit has a factor number (i.e your 290 for a 16mm dia). each cable then has a factor (i.e stranded 2.5 is 43). add up your cable factors and make sure they are lower than the conduit factor

 

so if you use a 20mm conduit (short straight run) with a factor of 460, how many 2.5 stranded with a factor of 43 will fit inside?

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