IIRC, UL does not actually require all products that it lists to have the UL mark on the product.
There are not many but there are a handful.
fiber requires the ul marking. from UL:
Q: I recently inspected a computer
facility that included runs of Type OFNP
optical fiber cable air in an air handling
space under a raised floor. The cable
was from a company that had a UL List-
ing, but I did not see a UL Mark on the
cable. What markings should be on the
cable for it to be acceptable for use in
this application?
A: Type OFN cable is listed under the
product category for Optical Fiber Cable
(QAYK). Listed optical fiber cable is required
to be marked with the cable type-letter
designation, e.g. OFN, OFNR, OFNP, etc.,
manufacturer’s identification and the UL
symbol or the letters “UL.” These markings
are provided on the outer surface of the
cable or on a marker tape that is readily
legible through a translucent or transparent
jacket. The markings are repeated at
intervals not longer than 40 inches.
In addition to these markings, a tag is
attached to the reel or carton containing
the cable or tied to every shipping length
of finished cable. This tag includes all of
the information noted above, along with the
complete UL Listing Mark and the following
information as a minimum:
“Optical-fiber cables are for installation
as described in Article 770 and other
applicable parts of the National Electrical
Code, NFPA 70. Where optical-fiber is
installed in a laser system, the system shall
comply with the ANSI Z136 laser system
safety standards.”
If the cable you inspected does not contain
the markings described above, it is not
considered to be UL Listed.
