OESC 334.12 Uses Not Permitted.

Installing the cable in accordance with Section 334.15 will require the cable to closely follow the building surface and be protected if exposed to physical damage. This image clearly shows what NOT to do.
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Installing the cable in accordance with Section 334.15 will require the cable to closely follow the building surface and be protected if exposed to physical damage. This image clearly shows what NOT to do.

NEC Section 334.12 provides a list of things that cannot be done with Nonmetallic Sheathed cable. Oregon has amended this section to add the underlined exception under line item 2:

Uses Not Permitted.

(A) Types NM and NMC. Types NM, NMC, and NMS cables shall not be permitted as follows:

(1) In any dwelling or structure not specifically permitted in 334.10(1), (2), (3), and (5)

(2) Exposed within a dropped or suspended ceiling cavity in other than one- and two-family and multifamily dwellings

Exception to (2): Types NM and NMC cables may be installed within a dropped or suspended ceiling cavity in structures other than one- and two-family and multifamily dwellings when installed in accordance with 334.15.

(3) As service-entrance cable

(4) In commercial garages having hazardous (classified) locations as defined in 511.3

(5) In theaters and similar locations, except where permitted in 518.4(B)

(6) In motion picture studios

(7) In storage battery rooms

(8) In hoistways or on elevators or escalators

(9) Embedded in poured cement, concrete, or aggregate

(10) In hazardous (classified) locations, except where specifically permitted by other articles in this Code.

Oregon amendments to the 2023 NEC® are located in “Table 1-E” of the Oregon Electrical Specialty Code (OESC) which can be seen using the following link or the OESC PDF file located near the bottom of the screen: 2023 OESC

  Click here to view the OESC  

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OESC 334.12 Uses Not Permitted.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true of nonmetallic sheathed cable (type NM)?

A: It can be installed in any occupancy.
B: It can be installed in a building of any type of construction.
C: It cannot be installed exposed, above a suspended ceiling, in a single family dwelling.
D: It can be installed within a dropped or suspended ceiling cavity, in other than one-and two-family and multifamily dwellings if installed in accordance with 334.15.
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