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 that 25 percent with respect to dissipation
ratings, maximum voltages, and current carrying capacity. Light duty
relays and similar switching devices shall be solid state type or sealed
electro-mechanical.
2.1.7.1
Components shall be designed to be maintained using commercially available
tools and equipment. Components shall be arranged and assembled so they
are accessible to maintenance personnel. There shall be no degradation in
tamper protection, structural integrity, EMI/RFI attenuation, or line
supervision after maintenance when it is performed in accordance with
manufacturer's instructions. The system shall be configured and installed
to yield a mean time to repair (MTTR) of not more than 8 hours. Repair
time is the clock time from the time maintenance personnel are given
entrance to the system and begin work, until the system is fully functional.
2.1.7.2
Interchangeability
The system shall be constructed with off-the-shelf components which are
physically, electrically and functionally interchangeable with equivalent
components as complete items. Replacement of equivalent components shall
not require modification of either the new component or of other components
with which the replacement items are used. Custom designed or
one-of-a-kind items shall not be used. Interchangeable components or
modules shall not require trial and error matching in order to meet
integrated system requirements, system accuracy, or restore complete system
functionality.
2.1.7.3
Electromagnetic and Radio Frequency Interference (EMI/RFI)
System components generating EMI/RFI shall be designed and constructed in
accordance with 47 CFR 15.
2.1.7.4
Product Safety
System components shall conform to applicable rules and requirements of
NFPA 70. System components shall be equipped with instruction plates,
including warnings and cautions, describing physical safety, and special or
important procedures to be followed in operating and servicing system
equipment.
2.1.8
Controls and Designations
Controls and designations shall be as specified in NEMA ICS 1.
2.1.9
Special Test Equipment
The Contractor shall provide all special test equipment, special hardware,
software, tools, and programming or initialization equipment needed to
start or maintain any part of the system and its components. Special test
equipment is defined as any test equipment not normally used in an
electronics maintenance facility.
2.1.10
Alarm Output
The alarm output of each sensor shall be a single pole double throw (SPDT)
SECTION 13721A
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