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Conduit Fill

IET on-site guide factor method

Reading 4

m

Reading 5 m

Results

Fill
26%
OK
Total cable factor120 (4 × 30)
Conduit capacity460 (20mm straight)
Headroom340

Suggested Materials

20mm PVC conduit (3m length)
2 pc
20mm conduit coupling
1 pc
20mm conduit saddle
500mm centres
10 pc
20mm 90° bend / inspection elbow
2 pc

Estimates use standard UK trade rules of thumb. Always check the bag/spec on the day.