Conduit filling as per BS/IEC

[tlp23]

Dear All,

Could you please let me know the percentage cable filling allowed for a conduit as per BS/IEC.

Regards,
Lakshmipati

 

[7anoter4]

I don't think it is such a standard. NEC ch.9 recommends the filling factors [it is not compulsory]. There are some other recommendations from other experience as this for instance:

http://www.spsx.com/uploadedFiles/C...Guidelines/TG16-Conduit-Fill-Requirements.pdf

 

[dpc]

I'm not familiar with BS standards, but the NEC limits conduit fill to 40% for three or more conductors. (e.g. Art 344.22 for rigid conduit)

 

[7anoter4]

see:

http://www.researchandmarkets.com/reportinfo.asp?report_id=586973&t=t

BS 7671:2008 recommends also 40%.

 

[tlp23]

Dear all,

Thanks for the answers.

7another4,

could you please let me know the section in which it is given as 40% filling.

Regards,
Lakshmipati

 

[7anoter4]

I think it is in The On-Site Guide .I took this sentence from a flexible conduit manufacturer:

http://www.flexicon.uk.com/en/index.php?page=threaddata.php

"UK wiring regulations BS7671, recommend that the total cross sectional area of the sum of the individual cables should not exceed 40% of the cross sectional area of the conduit"
And other stated:
"BS7671-2008 provide tables for cable and conduit factors, these can be found in the current IEE On Site guide BS7671-2008 Appendix 5 Pages 117 to 120"