NEC for Machines and Panels — Training — Control System Standards Atlas

Recommended entry modules

NEC Code Reading Fundamentals — start here for code structure and language rules
Branch Circuits vs. Feeders for Motor Loads — 125% conductor rule and feeder formula
Grounding and Bonding for Control Panels — EGC sizing and neutral/ground separation
SCCR Workflow — component method and NEC 409.110 marking

Module	Level	Time	Type
NEC Code Reading Fundamentals Core Learn the code's internal structure, how mandatory vs. permissive language works, and how to follow exception chains without missing requirements.	Beginner	20 min	Code Application
Working Space and Table Navigation Apply Table 110.26 correctly — read depth, width, and height requirements by condition of maintenance and voltage level.	Beginner	15 min	Code Application
Motor and Panel Code Application Core Route motor sizing through Article 430, calculate SCCR under Article 409, and identify Class 1 vs. Class 2 control circuit rules under Article 725.	Intermediate	30 min	Code Application
Branch Circuits vs. Feeders for Motor Loads Core Understand where a branch circuit ends and a feeder begins, and why motor loads require the 125% conductor multiplier from Article 430.	Beginner	20 min	Code Application
Disconnecting Means for Machinery Apply Art 430.102 in-sight rules, select permitted disconnect types, and understand how VFD installations change disconnect placement.	Beginner	20 min	Code Application
Grounding and Bonding for Control Panels Core Distinguish grounding from bonding, size the EGC from Table 250.122, and keep the neutral and ground buses correctly separated in downstream panels.	Beginner	25 min	Code Application
SCCR Workflow for Industrial Control Panels Core Follow the UL 508A component method to determine panel SCCR, understand why NEC 409.110 requires the marking, and use current-limiting devices to raise a low-rated panel.	Intermediate	30 min	Code Application
Conductor and OCPD Sizing Worked Examples Core Work through the four-step NEC motor sizing sequence — conductor, overload, OCPD, EGC — with complete examples for 10 HP and 25 HP motors and a feeder serving three motors.	Intermediate	30 min	Code Application
Class 1, Class 2, and Remote-Control Circuits Classify control circuits using Art 725, understand why the power supply listing determines Class 2 status, and apply separation rules to 24 VDC PLC wiring in machine panels.	Intermediate	25 min	Code Application
Practical Article 430 Workflow Core Navigate Art 430's internal structure by Part, apply the table-not-nameplate rule, and size conductors, overload, OCPD, and disconnect in the correct sequence.	Intermediate	30 min	Code Application
Practical Article 409 Workflow Apply Art 409 to industrial control panels — size supply conductors, verify required markings, understand the UL 508A relationship, and use the pre-shipment inspection checklist.	Intermediate	25 min	Code Application

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