Code Articles

[Therealcrt]

What are the top 10 code articles every electrician should know or what are some code articles commercial electricians should always know.

 

[LarryFine]

I've always thought Art. 250 was number one. I don't know if I could select ten.

 

[jim dungar]

240, particularly 240.21.

 

[don_resqcapt19]

The most important Article is 100. I would follow that by 240 and 250. However, the most important ones, other than 100, are the ones that apply to the installation you are doing.

 

[ActionDave]

90.1 Purpose

(A) Practical Safeguarding
The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. This Code is not intended as a design specification or an instruction manual for untrained persons.

 

[jaggedben]

You pretty much start at the beginning of the book. It's arranged from the most general to the more specialized.

If I had to pick an essential top 10, then in a pretty rough order:
90
100
110
250
310
240
230
210
215
300

Here are the two I wish residential electricians in my area knew better.
220
705

 

[tom baker]

Section 90.3
And Article 100

 

[roger]

Remember chapter 8 is for sissies.

 

[CoolWill]

90.1 Purpose

(A) Practical Safeguarding
The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity. This Code is not intended as a design specification or an instruction manual for untrained persons.

The NEC itself doesn't adhere to that article in some cases.

 

[ActionDave]

That is true, and it is a constant source of annoyance.

 

[LarryFine]

"Building codes! You can't live with 'em, you can't live without 'em!"

 

[Bill Snyder]

Chapter 3 is always the most important 300.4 is constantly misinterpreted

 

[mikeames]

The NEC itself doesn't adhere to that article in some cases.

I always cite 406.12 (7) for being contrary to "not intended as a design specification".

All dorms need tamper resistant receps.

 

[JoeStillman]

I always recommend memorizing the 75°C column of table 310.15. It helps to be able to spot at a glance any mismatch between wires and breakers. Just copy it down on a piece of paper. Fill up the page with copies of that one column. Then throw it away and do it again.