Field glossary

Jam ratio

Conduit inside diameter over cable outside diameter for three same-size cables; a band near 2.8 to 3.0 risks jamming

Used across 2 Anvilfield field guides, most in Electrical.

Also defined as

1.05 times conduit ID over cable OD; about 2.8 to 3.0 is the danger zone for three same-size cables

Where this shows up