# Diameter over insulation

For cables, this is the diameter below the insulation screen, which is an important parameter for dimensioning the accessories. For heat sources, this is the insulation around the pipe.

Symbol
$D_{ins}$
Unit
mm
Formulae
 $d_c+2\left(t_{ct}+t_{cs}+t_{ins}\right)$ cable $do_{pipe}+2t_{ins}$ heat source
Related
$d_c$
$do_{pipe}$
$t_{cs}$
$t_{ct}$
$t_{ins}$
Used in
$A_{prot}$
$D_{prot}$
$T_1$
$T_{ins}$
$T_{is}$
$T_{prot}$
$U_{wall}$
OHTC of pipe wall [W/(K.m$^2$)]