NOTE: Either round key or conventional key type
locks are acceptable for use in the system.
Selection should be based on hardware availability
at the time of design and the requirements for
matching locks currently in use at the site. If the
locks do not have to be matched to locks in use, and
the designer has no preference, all brackets may be
removed.
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2.1.5.1 Locks
Locks shall be provided on system enclosures for maintenance purposes.
Locks shall be UL listed, [round-key type with 3 dual, 1 mushroom, 3 plain
pin tumblers][ or ][conventional key type lock having a combination of 5
cylinder pin and 5-point 3 position side bar]. Keys shall be stamped "U.S.
GOVT. DO NOT DUP". The locks shall be arranged so that the key can only be
withdrawn when in the locked position. Maintenance locks shall be keyed
alike and only 2 keys shall be furnished for all of these locks. These
keys shall be controlled in accordance with the key control plan as
specified in paragraph Key Control Plan.
2.1.5.2 Key-Lock-Operated Switches
Key-lock-operated switches required to be installed on system components
shall be UL listed, [round-key type, with 3 dual, 1 mushroom, and 3 plain
pin tumblers][ or ][conventional key type lock having a combination of 5
cylinder pin and 5-point 3 position side bar]. Keys shall be stamped "U.S.
GOVT. DO NOT DUP". Key-lock-operated switches shall be 2 or 3 position,
with the key removable in specified positions. All key-lock-operated
switches shall be keyed differently and only 2 keys shall be furnished for
each key-lock-operated-switch. Keys shall be removable in the positions
described in these specifications or as shown on the drawings. Keys shall
be controlled in accordance with the key control plan as specified in
paragraph Key Control Plan.
2.1.5.3 Construction Locks
A set of temporary locks shall be used during installation and
construction. The final set of locks installed and delivered to the
Government shall not include any of the temporary locks.
2.1.6 System Components
System components shall be designed for continuous operation. Electronic
components shall be solid state type, mounted on printed circuit boards
conforming to
UL 796
. Printed circuit board connectors shall be plug-in,
quick-disconnect type. Power dissipating components shall incorporate
safety margins of not less than 25 percent with respect to dissipation
ratings, maximum voltages, and current carrying capacity. Control relays
and similar switching devices shall be solid state type or sealed
electro-mechanical.
2.1.6.1 Modularity
Equipment shall be designed for increase of system capability by
installation of modular components. System components shall be designed to
facilitate maintenance through replacement of modular subassemblies and
parts.
SECTION 34 41 26.00 10 Page 24