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This is the radius over all insulation layers up to the first metallic shielding layer.
For single-core cables, this is typically the radius of the insulation without the insulation screen (outer semi-conducting layer). In case of nulti-core cables screen, this is the radius from the center of the cable to the screen, sheath or armour.
| $\frac{D_{ins}}{2}$ | single-core cables, with screen/sheath |
| $\frac{D_{ab}}{2}$ | single-core cables, without screen/sheath, with armour |
| $\frac{D_j}{2}$ | single-core cables, without screen/sheath, without armour |
| $\frac{D_{ins}}{2}$ | multi-core cables SC/SS or with, screen SS or with, sheath > 36 kV |
| $\frac{D_{scb}}{2}$ | belted cables (CC), with common screen |
| $\frac{D_f}{2}$ | belted cables (CC), no screen, with common sheath |
| $\frac{D_{scb}}{2}$ | belted cables (SC), with separate screen |
| $\frac{D_f}{2}+t_{ab,1}$ | belted cables (SC), no screen, with common sheath |
| $\frac{D_{scb}}{2}$ | belted cables (SS), with separate screen |
| $\frac{D_{scs}}{2}$ | belted cables (SS), no screen, with separate sheath |
| $\frac{D_f}{2}+t_{ab,1}$ | belted cables, no screen, no sheath, with armour |
| $\frac{D_j}{2}$ | belted cables, no screen, no sheath, without armour |