Conduit ratio

Conduit ratio is the ratio between the diameter of a single cable to the inner diameter of the duct. The conduit ratio is a measure for the cable configuration in the duct and Cableizer uses the following ratio limits:

Three cables unbound have a triangular configuration for $CR_{pull}$ < 2.5 and a cradled configuration for $CR_{pull}$ ≥ 2.5.
Three cables triplex always have a triangular configuration.

Four cables unbound have a diamond configuration for $CR_{pull}$ < 3.0 and a cradled configuration for $CR_{pull}$ ≥ 3.0.
Three cables quadruplex always have a diamond configuration.

Symbol

$CR_{pull}$

Formulae

$\frac{Di_d}{D_e}$

Related

$D_e$

External diameter of object [mm]

$Di_d$

Inner diameter of duct [mm]