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NEC Article 409
Siemens NEC Article 409 User Manual
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Reference Manual
Industrial Controls
Short-circuit current rating (SCCR) of industrial control panels
06/2013
Edition
Answers for industry.
2
Table of Contents
Table of Contents
5
Introduction
7
Overview of NEC Article 409
9
Overview of Supplement SB from the UL 508A Standard
11
Basic Steps for Calculating the SCCR of a Control Panel
13
SB4.2 - Determining the Short-Circuit Current Ratings (SCCR) of Individual Power Circuit Components
13
Basic: Device Markings or Component Instruction Sheets
13
Basic: Assumed Short-Circuit Current Rating
14
Basic: Tested Combination of Devices According to UL508
14
SB4.3 - Adaptation of the Available Short-Circuit Current Rating Based on the Peak Let-Through Currents When Using Current-Limiting Devices in the Feeder Circuit
18
Current-Limiting Transformers
18
Current-Limiting Circuit Breakers (According to UL489)
18
Current-Limiting Fuses
20
SB4.4 - SCCR Calculation of the Industrial Control Panel
23
Flow Chart for Calculating the SCCR of a Component
25
Calculation of the Short-Circuit Current Rating of an Individual Power Circuit Component According to UL 508A SB4.2
25
Calculation of the Short-Circuit Current Rating of Current-Limiting Feeder Components
26
Calculation of the Short-Circuit Current Rating of a Control Panel in Accordance with UL 508A Supplement SB 4.4
28
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Siemens NEC Article 409 Specifications
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Brand
Siemens
Model
NEC Article 409
Category
Industrial Equipment
Language
English
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