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Understanding The NEC Format – Half I Chapters
One factor that helps you perceive the NEC is taking a birds-eye-view of the way it’s laid out as a guide.
The Chapters are usually not simply randomly laid out as you could assume there’s a goal in HOW it’s laid out and
why.
The 2017 NEC has a desk of contents, 9 Chapters, 10 informational annexes, and an index – all of which
serve a sure matter or goal. Understanding the structure of those Chapters is essential in with the ability to work
by way of the e book to seek out codes each on the job in addition to within the testing heart, whereas taking an examination. Let’s
check out it from above:
Chapter 1 – Normal
Chapter 2 – Wiring and Safety
Chapter 3 – Wiring Strategies and Supplies
Chapter 4 – Gear for Normal Use
Chapter 5 – Particular Occupancies
Chapter 6 – Particular Gear
Chapter 7 – Particular Situations
Chapter 8 – Communications Programs
Chapter 9 – Tables
Annex A – Product Security Requirements
Annex B – Software Data for Ampacity Calculation
Annex C – Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Similar Measurement
Annex D – Examples
Annex E – Forms of Building
Annex F – Availability and Reliability for COPS and FPTs for COPS
Annex G – Supervisory Management and Information Acquisition (SCADA)
Annex H – Administration and Enforcement
Annex I – Beneficial Tightening Torque Tables from UL Normal 468A-B Annex J – ADA Requirements
for Accessible Design
Table of Contents and Index :
Chapters 1-4
Discover that Chapters 1-Four are mixed into one conceptual group. These Chapters are guidelines that
usually apply to all locations and tools you’re going to run into. That is the bedrock/basis of all
of the code information within the NEC and what you’ll depend on generally. These Chapters are requirements for
houses, residences, banks, strip malls – regular, on a regular basis locations and conditions that the majority electricians are
going to come back throughout every day.
Chapters 5-7
Chapters 5-7 are all grouped collectively as nicely, as a result of these Four Chapters are “particular instances” (areas,
tools, conditions) that complement or modify info in Chapters 1-7. If you happen to’re in an setting
the place lots of people assemble (like a live performance), or in a corrosive setting (round massive our bodies of
water), you’ll look in Chapters 5-7. Not simply the situation, however the tools might be specialised as nicely. If
you’re engaged on tools that isn’t normal air conditioners and water-heaters, akin to cranes,
welders, elevators, and x-ray tools, you’ll look to Chapters 5-7 for these guidelines.
Chapters 8-9 and Annex C
The rationale I’ve Chapters 8, 9, and Annex C grouped collectively is that, in most states, you is probably not
examined on these, however they could provide help to discover info that may get you solutions to check questions. They
have comparable info and features. Chapter Eight applies to communications circuits, most of which
apply to low voltage programs and usually are not required code. In Article 90.3, the NEC states, “Chapter 8
covers communication programs and isn’t topic to the necessities of Chapters 1-7, besides the place the
necessities are particularly reference in Chapter 8.”
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