Siemens NEC Article 409 - Page 3

Short-circuit current rating (SCCR) of
industrial control panels
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NEC Article 409 and UL 508A
Short-circuit current rating (SCCR)
of industrial control panels
Reference Manual
06/2013
A5E31896849002A/RS
-AA/001
Introduction
1
Overview of NEC Article 409
2
Overview of Supplement SB
from the UL 508A standard
3
Basic steps for calculating
the SCCR of a control panel
4
Flow chart for calculating the
SCCR of a component
5