Enter the internal diameter of the conduit and the overall diameter of each cable, from the drum or a calliper. Fill is the sum of the cable areas divided by the conduit area. The pass line here is 35%.
Many containment rules use a space factor a bit higher than 35%, so a pass here has a margin. This does not store cable-diameter tables. If a cable is larger than the conduit, or the run has bends that the regulations treat differently, check the containment rules for that system.
These tools are quick guides for a ballpark figure. They are not certified design or test software, and a result on this page is not a design, a certificate, or a substitute for the current edition of BS 7671. Check the working and cross-reference it before you apply it to a real installation. Thanet Electrical Ltd does not accept liability for loss or cost arising from reliance on these figures, except where the law does not allow that liability to be excluded, including death or personal injury caused by negligence.
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