ABB SafeRing Product Manual page 15

When installing Ring Main Unit or Compact Switchgear
with Internal Arc Classification AFL with ventilation be-
hind the switchgear, the following must be considered:
− Unit must be equipped with arc proof cable covers.
− Distance from floor to roof must be minimum 2400 mm
− Distance from back of unit to wall must be 100 mm
− Arc shields with height 650 mm must be mounted
− If unit is freestanding (i.e. distance from back of unit to wall
exceeds 100 mm), the area behind the unit must be restric-
ted and not accessible.
WARNING
Distance from side wall: 20 mm. If installed more
than 20 mm from sidewall, an arc shield is re-
quired. For easier installation, it is recommended
that any switchgear requiring arc shields is in-
stalled minimum 300 mm from sidewall.
20 - 300 mm
Marked area is restricted, but installation is allowed if mount-
ing of arc shield is feasible.
For installation of switchgear with Internal Arc Classi-
fication AFL with ventilation down in cable trench, the
following must be considered:
− Unit must be equipped with arc proof cable covers
− Distance from floor to roof must be minimum 2000 mm
− Distance from back of unit to wall must be 100 mm
− Cable compartment back plate has to be mounted
− Length of cable trench must be 2000 mm, with an opening
of minimum 0,5 m2
− Minimum dimensions of cable trench are 230 x 355 mm
*
* Arc shield.
Height of arc shield for M-module is
1317 mm
* 1100 mm version available as optional
solution
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