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📘 National Electrical Code (NEC) – Structure Overview

NEC total 9 Chapters par based hota hai, aur unke andar multiple Articles hote hain.

NEC Articles numbering generally Article 90 se start hoti hai aur Article 830 tak jati hai.

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🔹 Chapter 1 – General

Article	Topic
90	Introduction
100	Definitions
110	Requirements for Electrical Installations

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🔹 Chapter 2 – Wiring and Protection

Article	Topic
200	Use and Identification of Grounded Conductors
210	Branch Circuits
215	Feeders
220	Load Calculations
225	Outside Branch Circuits and Feeders
230	Services
240	Overcurrent Protection
250	Grounding and Bonding
280	Surge Arresters
285	Surge Protective Devices

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🔹 Chapter 3 – Wiring Methods and Materials

Article	Topic
300	General Wiring Methods
310	Conductors for General Wiring
312	Cabinets and Cutout Boxes
314	Outlet and Junction Boxes
320–399	Different Cable & Raceway Types

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🔹 Chapter 4 – Equipment for General Use

Article	Topic
400	Flexible Cords
404	Switches
406	Receptacles
408	Switchboards & Panelboards
409	Industrial Control Panels
410	Luminaires
422	Appliances
430	Motors
440	Air-Conditioning
445	Generators
450	Transformers

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🔹 Chapter 5 – Special Occupancies

Article	Topic
500	Hazardous Locations
510	Aircraft Hangars
517	Healthcare Facilities
547	Agricultural Buildings

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🔹 Chapter 6 – Special Equipment

Article	Topic
600	Signs
620	Elevators
625	EV Charging
690	Solar PV Systems

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🔹 Chapter 7 – Special Conditions

Article	Topic
700	Emergency Systems
701	Legally Required Standby
702	Optional Standby
705	Interconnected Power Sources

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🔹 Chapter 8 – Communication Systems

Article	Topic
800	Communication Circuits
810	Radio & TV Equipment
820	CATV Systems
830	Network-Powered Broadband

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🔹 Chapter 9 – Tables

• Conduit fill tables
• Cable fill calculations
• Resistance tables

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🎯 Interview Important Articles (Application Engineer ke liye)

Aap ko specially in par focus karna chahiye:

• Article 100 (Definitions)
• Article 110 (General Requirements)
• Article 210 (Branch Circuits)
• Article 220 (Load Calculation)
• Article 240 (Overcurrent Protection)
• Article 250 (Grounding)
• Article 300 (Wiring Methods)
• Article 310 (Cable sizing)
• Article 409 (Industrial Control Panels)
• Article 430 (Motors)

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