IEC CEI EN 62271-200 Norm
Internal arc
Designation of the classification IAC
In the case where the classification IAC is established from tests, the switchboard will be designated in the following way:
- General: classification IAC (initials for "Internal Arc Classified")
- Accessibility: (A) (B) (C)
- Values Test: Test current in kilo-amperes (kA), duration in seconds (s).
Example 1: the framework tested with a fault current of 12.5 KA, for 0.5 s for installation in a public place (B) and tested with the indicators on the front, sides and back of the picture, will be designated as follows:
classification IAC BFLR, arc 12.5 kA 0,5 s
Example 2: the framework tested with a fault current of 16 KA for 1 s, for installation on a site with access only to authorized personnel (A), tested with indicators on the front and on the sides of the picture, will be designated as follows:
classification IAC AFL, arc 16 kA 1 s
Note: accessibility (C) applies to equipment installed on a pole
example: IAC AFLR 16kA 1s
A = Class of accessibility (in this case for authorized personnel)
FLR =
F = protection on the front
L = lateral protection
R = rear protection