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
