- U -
UL
abb. Underwriters
Laboratories
UL fire resistive container classifications
class 125
n. a group of UL classifications for containers that maintain inside
temperatures less than 125 degrees Fahrenheit when exposed to a fire of
specific temperature and duration. The times and fire temperatures are:
½ hour 1700 degrees F.
1 hour 1700 degrees F.
2 hour 1850 degrees F.
3 hour 1925 degrees F.
4 hour 2000 degrees F.
class 150
n. a group of UL classifications for containers that maintain inside
temperatures less than 150 degrees Fahrenheit when exposed to a fire of
specific temperature and duration. The times and fire temperatures are:
½ hour 1700 degrees F.
1 hour 1700 degrees F.
2 hour 1850 degrees F.
3 hour 1925 degrees F.
4 hour 2000 degrees F.
class 350
n. a group of UL classifications for containers that maintain inside
temperatures less than 350 degrees Fahrenheit when exposed to a fire of
specific temperature and duration. The times and fire temperatures are:
½ hour 1700 degrees F.
1 hour 1700 degrees F.
2 hour 1850 degrees F.
3 hour 1925 degrees F.
4 hour 2000 degrees F.
UL
listed
adj. listed in a
directory as having passed specific Underwriters
Laboratories testing
unassociated
change key
n. a change key
which is not related directly to a particular master key
through the use of certain constant cuts
unassociated
master key
n. a master key
which does not have change keys related to its
combination through the use of constant cuts
uncombinated
adj. 1. of or
pertaining to a cylinder which is or is to be supplied
without keys, tumblers and springs 2. of or pertaining to
a lock, cylinder or key in which the combination has not
been set
uncontrolled
cross keying
n. a condition in
which two or more different keys under different higher
level keys operate one cylinder by design; e.g., XAA1
operated by AB, AB1. Note: This condition severely limits
the security of the cylinder and the maximum expansion of
the system, and often leads to key interchange
unibolt
n. a single plate of
steel used in place of individual multiple bolts to lock a
safe door
unidirectional
cylinder
n. a cylinder whose
key can turn in only one direction from the key pull
position
USB key
n. a hardware key
connected to a USB port
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