ABB
6
Uniswitc h Operation a nd
Mainte na nc e Manua l
UNI S14GB 05-02
2.2 Internal arc classification
Data
Resistance to internal arc faults is as follows:
Table 2.2
Fault withstand capacity.
12 kV
20 kA
1s
17.5 kV
20 kA
1s
24 kV
20 kA
1s
Standards
The switchgear units have been tested according to IEC 60298
Standards (appendix AA, class A, criteria 1 to 6).
! Uniswitch switchgear has to be installed in closed rooms
suitable for electrical equipment. This means the
accessibility must be restricted to authorised personnel
only.
The rear side of the switchgear is not accessible. Rear-side
accessibility must be discussed with the manufacturer.
