COMMUNITY FORUM

gtodoug

01:09PM | 03/13/07
Member Since: 03/12/07
2 lifetime posts
Bvelectrical
I have searched the net... No luck on an answer to this ?

I'm removing knob & tube thruout our 100 year old american 4-square. I have figured out ways to get either access to or alternate entry points to get at every single circut in the house.

Looking down from the attic, I know there is interior blocking that I will have to get thru. So I have a 6 foot flexible 1/2 bit and guide tool ordered. I am trying to do this to code (will get inspection) since we are in a nice historic district. But I also don't want to tear up the plaster/lather either. All electical boxes are buried under the plaster

I'm concerned about the code requirements for nailing down the sheathed electrical cable every 4 feet or so and the 12" from a box need. Some of my drops from the attic will be over this length(9'). For that matter I am bringing circuts up from the basement over 18-20 feet.

What is the best and easiest way to remain code compliant? (Indiana if it is important)

Many, Many Thanks, Doug

househelper

10:03AM | 03/14/07
Member Since: 03/31/05
265 lifetime posts
The NEC does not require you to secure NM wiring when fishing inside finished walls.

Billhart

12:53PM | 03/14/07
Member Since: 04/25/05
1916 lifetime posts
"334.30 Securing and Supporting

Nonmetallic-sheathed cable shall be supported and secured by staples, cable ties, straps,

hangers, or similar fittings designed and installed so as not to damage the cable, at

intervals not exceeding 1.4 m (4 1/ 2 ft) and within 300 mm (12 in.) of every outlet box,

junction box, cabinet, or fitting. Flat cables shall not be stapled on edge.

Sections of cable protected from physical damage by raceway shall not be required to be

secured within the raceway."

...

"(B) Unsupported Cables Nonmetallic-sheathed cable shall be permitted to be

unsupported where the cable:

(1) Is fished between access points through concealed spaces in finished buildings or

structures and supporting is impracticable."

...

gtodoug

02:01PM | 03/14/07
Member Since: 03/12/07
2 lifetime posts
I'm feeling better about it to see the actual code. So I took the next step and took your excerpt and googled the exact text... Only one site came up. The town of Carol Stream IL code of ordances looks to have replicated the NEC. Bunch of lines struck thru for some reason, but.. Here's the link.

http://www.carolstream.org/ReferenceDesk/Forms/Community%20Development/BldCodes/NationalElectricNFPA70.pdf

Thanks again!

Doug

Billhart

03:56PM | 03/14/07
Member Since: 04/25/05
1916 lifetime posts
That is not the NEC.

What the NEC publishes is called a "model code". Much all of the other national building codes.

It is meaningless. Your community has to adopt a specific version of a specific code and also any amendments.

What that link is to is the adoption ordinacne. The first part talks about how the city works; who does the inspections, how to get permits, etc.

The latter part list all of the sections fo the NEC that have been modified.

It is hard to tell how much of the NEC is included without going through paragraph by paragraph.

Most areas only make slight amendments or none at all.

But many cities in the Chicago are make extensive changes to prohibit nonmetal cable (sheathed electrical cable) and many other common materials.

In most cases codes are copyrighted and can't be posted online without the permission of the organization that publishes it.

From time to time you will find that someone has put one online.

I download a copy, but the site seems to be gone now.
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