Cracked CTs

[weressl]

Laszlo,
Where in the NEC does it require these rebuilt breakers be UL Listed?

Jim,

Let me turn this around. Where do you find exceptions that unlisted components and equipment can be used?

90.7 Examination of Equipment for Safety.​

​

​

For specific
items of equipment and materials referred to in this Code,
examinations for safety made under standard conditions
provide a basis for approval where the record is made generally
available through promulgation by organizations
properly equipped and qualified for experimental testing,
inspections of the run of goods at factories, and servicevalue
determination through field inspections. This avoids
the necessity for repetition of examinations by different
examiners, frequently with inadequate facilities for such
work, and the confusion that would result from conflicting
reports on the suitability of devices and materials examined
for a given purpose.
It is the intent of this Code that factory-installed internal
wiring or the construction of equipment need not be
inspected at the time of installation of the equipment, except
to detect alterations or damage, if the equipment has
been listed by a qualified electrical testing laboratory that is
recognized as having the facilities described in the preceding
paragraph and that requires suitability for installation in
accordance with this Code.​

FPN No. 1: See requirements in 110.3.
FPN No. 2:​

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Listed is defined in Article 100.
FPN No. 3: Annex A contains an informative list of product
safety standards for electrical equipment.

​

 

[jim dungar]

Laszlo,

90.7 does not require any type of listing. It simply gives the AHJ the ability to accept an item that has been tested by a qualified company using industry standard procedures.

To my knowledge there is no UL listing for general use motors. Using your logic we would never be able to replace an existing motor much less rewind/rebuild one.