This is the radius to the centerline of the bend.

When calculating the sidewall bearing pressure $F_{rad}$ the inside bending radius of the conduit is used instead, which is calculated according to the formula below. In addition, the smallest inside bending radius along the cable route should always be larger than the allowed minimal bending radius $r_{mbp}$.

Symbol
$r_{arc}$
Unit
m
Formulae
$r_{arc}-\frac{Di_d}{2000}$
Related
$Di_d$
$r_{mbp}$
Used in
$F_{pull}$
$F_{rad}$