OESC 408.9(B) Panelboards Not Listed for the Specific Enclosure.

Retrofit panelboard meant for installation into an existing cabinet.
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Retrofit panelboard meant for installation into an existing cabinet.

NEC 408.9 provides rules on replacement panelboards.

In Oregon, 408.9(B) has been amended to read as follows:

408.9(B) Panelboards Not Listed for the Specific Enclosure. If the available fault current is greater than 10,000 amperes, the completed work shall be field labeled. If the available fault current is 10,000 amperes or less, the replacement panelboard shall be identified for the application. Any previously applied listing marks on the cabinet that pertain to the panelboard shall be removed.

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 408.9(B) Panelboards Not Listed for the Specific Enclosure.

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

In Oregon, which of the following is true of a replacement panelboard not listed for a specific enclosure?

A: If the available fault current is 3,000 amperes, the completed work shall be field labeled.
B: If the available fault current is 4,000 amperes, the completed work shall be field labeled.
C: If the available fault current is 5,000 amperes, the completed work shall be field labeled.
D: If the available fault current is greater than 10,000 amperes, the completed work shall be field labeled.
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