Recoginzed components just slapped into a cabinet

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nhfire77

Senior Member
Location
NH
Humor me—Is there something in the NEC that would prohibit an UL recognized (Not listed) open frame 120-24 transformer (power limited output) in a NEMA 1 cabinet?

This isn’t a panel shop building it.
 

Jraef

Moderator, OTD
Staff member
Location
San Francisco Bay Area, CA, USA
Occupation
Electrical Engineer
Humor me—Is there something in the NEC that would prohibit an UL recognized (Not listed) open frame 120-24 transformer (power limited output) in a NEMA 1 cabinet?

This isn’t a panel shop building it.
110.3 (A)

(1) Suitability for installation and use in conformity with
the provisions of this Code
Informational Note: Suitability of equipment use may be
identified by a description marked on or provided with a
product to identify the suitability of the product for a specific
purpose, environment, or application. Special conditions
of use or other limitations and other pertinent information
may be marked on the equipment, included in the
product instructions, or included in the appropriate listing
and labeling information.
Suitability of equipment may be
evidenced by listing or labeling.

If an inspector understands the difference between a UL LISTED, vs a UL RECOGNIZED COMPONENT (backward UR), they will bounce it.

Recognized Component means it can ONLY be used as PART of a complete assembly that will itself then be UL listed. You can never use a UR labeled device stand-alone.
 

mpoulton

Senior Member
Location
Phoenix, AZ, USA
110.3 (A)

If an inspector understands the difference between a UL LISTED, vs a UL RECOGNIZED COMPONENT (backward UR), they will bounce it.

Recognized Component means it can ONLY be used as PART of a complete assembly that will itself then be UL listed. You can never use a UR labeled device stand-alone.

...in an application where listing is a requirement. If NRTL listing is not required in this situation, then it doesn't matter whether the parts are listed, recognized, or neither. Being "recognized" just means the part can be used in a listed assembly - not that it can't be used otherwise.
 
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