USACE / NAVFAC / AFCESA / NASA UFGS-27 51 16 (April 2006)
-----------------------------
Preparing Activity: USACE Superseding
UFGS-27 51 16 (November 2003)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 27 51 16
RADIO AND PUBLIC ADDRESS SYSTEMS
04/06
NOTE: This guide specification covers the requirements for radio and public
address systems.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
PART 1 GENERAL
NOTE: This guide specification is to be used in conjunction with Section
26 20 00 INTERIOR DISTRIBUTION SYSTEM.
If there is a requirement to integrate a Personnel Alerting System (to alert
building occupants of eminent threat) to the PA system, assure that the necessary
inputs and interfaces are included in this specification.
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[CONSUMER ELECTRONICS ASSOCIATION (CEA)CEA-310-E(2005) Racks, Panels, and Associated Equipment][INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)IEEE C62.41.1(2002) IEEE Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power CircuitsIEEE C62.41.2(2002) IEEE Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][UNDERWRITERS LABORATORIES (UL)UL 1449(2006) Surge Protective Devices]1.2 SYSTEM DESCRIPTION
The radio and public address system shall consist of an audio distribution network to include amplifiers, mixers,
microphones, speakers, cabling, and ancillary components required to meet the required system configuration and
operation.
1.2.1 Multi-Channel System with Paging
The system shall include microphones, microphone outlet receptacles, microphone inputs with preamplifiers, inputs
for [film sound,] [compact disc,] [magnetic tape,] [telephone,] [and] [_____] program sources, [single] [all]
channel paging, control for each input, power amplifying equipment, and accessories required to output the public
address and paging audio signals through selected portions of the audio distribution network as indicated. The
paging signal shall replace by zones [channel [_____]] [all channels] of the radio system output, when the paging
function is activated.
1.2.2 Single-Channel System
The system shall control and amplify an audio program for distribution within the areas indicated. Components
of the system shall include a [mixer-preamplifier,] [mixer-amplifier,] [mike input expander,] [power amplifier,]
[microphone,] [speaker system,] [compact disc,] [cassette player,] [AM-FM tuner,] cabling and other associated
hardware.
1.2.3 System Performance
The system shall provide even sound distribution throughout the designated area, plus or minus 3 dB for the 1/1
octave band centered at 4000 Hz. The system shall provide uniform frequency response throughout the designated
area, plus or minus 3 dB as measured with 1/3-octave bands of pink noise at locations across the designated area
selected by the Contracting Officer. The system shall be capable of delivering 75 dB average program level with
additional 10 dB peaking margin sound pressure level (SPL) in the area at an acoustic distortion level below
5 percent total harmonic distortion (THD). Unless otherwise specified the sound pressure reference level is
20 micro Pascal (0.00002 Newtons per square meter).
1.2.4 Detail Drawings
Submit detail drawings consisting of a complete list of equipment and material, including manufacturer's descriptive
and technical literature, performance charts and curves, catalog cuts, and installation instructions. Note that
the contract drawings show layouts based on typical speakers. Check the layout based on the actual speakers
to be installed and make necessary revisions in the detail drawings. Detail drawings shall also contain complete
point to point wiring, schematic diagrams and other details required to demonstrate that the system has been
coordinated and will properly function as a unit. Drawings shall show proposed layout of equipment and appurtenances,
and equipment relationship to other parts of the work including clearances for maintenance and operation.
1.3 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are for [Contractor Quality Control approval.][information only. When used, a designation following the "G"
designation identifies the office that will review the submittal for the Government.] The following shall be
submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Detail Drawings[; G][; G, [_____]]
Detail drawings as specified.
SD-03 Product Data
Spare Parts
Spare parts data for each different item of material and equipment specified.
SD-06 Test Reports
Approved Test Procedures[; G][; G, [_____]]
Test plan and test procedures for the acceptance tests. The test plan and test procedures
shall explain in detail, step-by-step actions and expected results to demonstrate compliance
with the requirements specified. The procedure shall also explain methods for simulating the
necessary conditions of operation to demonstrate system performance.
Acceptance Tests
Test reports in booklet form showing all field tests performed to adjust each component and
to prove compliance with the specified performance criteria, upon completion and testing of
the installed system. The reports shall include the manufacturer, model number, and serial
number of test equipment used in each test. Each report shall indicate the final position of
controls and operating mode of the system.
SD-07 Certificates
Components
Copies of current approvals or listings issued by UL, or other nationally recognized testing
laboratory for all components.
SD-10 Operation and Maintenance Data
Radio and Public Address System
Submit Data Package 3 in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA
1.4 DELIVERY, STORAGE, AND HANDLING
Equipment placed in storage until installation shall be stored with protection from the weather, humidity and
temperature variations, dirt and dust, and other contaminants.
1.5 EXTRA MATERIALS
Submit spare parts data for each different item of material and equipment specified, after approval of the detail
drawings and not later than [2] [_____] months prior to the date of beneficial occupancy. The data shall include
a complete list of parts and supplies, with current unit prices and source of supply.
PART 2 PRODUCTS
2.1 STANDARD PRODUCTS
Provide materials and equipment which are the standard products of a manufacturer regularly engaged in the manufacture
of such products, and that essentially duplicate material and equipment that have been in satisfactory use at
least 2 years. All components used in the system shall be commercial designs that comply with the requirements
specified. Equipment shall be supported by a service organization that is within [_____] miles of the site.
2.1.1 Identical Items
Items of the same classification shall be identical. This requirement includes equipment, modules, assemblies,
parts, and components.
2.1.2 Nameplates
Each major component of equipment shall have the manufacturer's name, address, model and catalog number, and
serial number on a plate secured to the equipment.
2.2 MIXER-PREAMPLIFIER
NOTE: Verify that the designated number of inputs are sufficient to meet the
requirements of the design and increase the number of inputs if required.
Consideration should be given to the use of a mixer-amplifier instead of a mixer-preamplifier/power-amplifier
combination. Mixer-amplifiers may not be available for power outputs of 200
watts or greater.
Mixer-preamplifier shall as a minimum conform to the following specifications:
Rated Output: 18 dB
Frequency Response: Plus or Minus 1 dB, 20 - 20,000 Hz
Distortion: Less than 0.5 percent, 20 - 20,000 Hz
Signal to noise: Microphone - 60 dB
Aux - 70 dB
Inputs: 5 independent balanced low- impedance
transformer-isolated
Input Sensitivity: Microphone - 0.003 volts
Aux - 0.125 volts
Magnetic Cartridge - 0.0005 volts
Input Channel
Isolation: 80 dB minimum
Tone Controls: Plus or Minus 10 dB range at 50 and 15,000 Hz
Power Requirement: 110-125 Vac 60 Hz
2.3 POWER AMPLIFIERS
NOTE: The required wattage rating will be inserted in the blank. For radio
system, this wattage may be computed as follows: Allow 1 watt for each loudspeaker.
Use 1.4 multiplier for reserve power. Auditorium systems will have an output
of not less than 20 watts or not less than 10 watts per 100 seats, whichever
is greater. Special consideration will be given to acoustics, speaker placement,
and the functions for which the system will be used, particularly for large
auditoriums where music will be reproduced or amplified.
Power amplifiers as a minimum conform to the following specifications:
Rated power output: [60] [125] [250] [_____] watts RMS
Frequency Response: Plus or Minus 3 dB, 20-20,000 Hz
Distortion: Less than 2 percent at RPO, 600-13,000 Hz
Input Impedance: 50 k ohm unbalanced
Output Impedance: Balanced 4 and 8 ohms
Output voltage: 25 and 70.7 volts
Power Requirement: 110-125 Vac 60 Hz
2.4 MIXER AMPLIFIER
NOTE: Verify that the designated number of inputs are sufficient to meet the
requirements of the design and increase the number of inputs if required.
Consideration should be given to the use of a mixer-amplifier instead of a mixer-preamplifier/power-amplifier
combination. Mixer-amplifiers may not be available for power outputs of 200
watts or greater.
The required wattage rating will be inserted in the blank. For radio system,
this wattage may be computed as follows: Allow 1 watt for each loudspeaker.
Use 1.4 multiplier for reserve power. Auditorium systems will have an output
of not less than 20 watts or not less than 10 watts per 100 seats, whichever
is greater. Special consideration will be given to acoustics, speaker placement,
and the functions for which the system will be used, particularly for large
auditoriums where music will be reproduced or amplified.
Mixer amplifier shall as a minimum conform to the following specifications:
Rated Power Output (RPO): [35] [60] [125] [_____] watts RMS
Frequency Response: Plus or Minus 3 dB, 20-20,000 Hz
Distortion: Less than 1% at RPO, 60 - 13,000 Hz
Inputs: 2 microphones (high impedance or
low-impedance unbalanced
2 Aux. (high-impedance)
Output Impedance: Balanced 4 and 8 ohms
Output Voltage: 25 and 70.7 volts
Power Requirement: 110-125 Vac 60 Hz
2.5 MICROPHONE INPUT MODULES
NOTE: Verify that the designated number of inputs are sufficient to meet the
requirements of the design and increase the number of inputs if required.
Microphone input modules shall as a minimum conform to the following specifications:
Rated Outputs: 0.25 volts into 10,000 ohms
1.0 volts into 10,000 ohms
Frequency Response: Plus or Minus 2 dB, 20 - 20,000 Hz
Distortion: Less than 0.5 percent 20 - 20,000 Hz
Inputs: 4 transformer - coupled balanced 150 ohm
Input Sensitivity: 0.003 volts
Input Channel
Isolation: 70 dB minimum
2.6 MICROPHONES
2.6.1 Desk Microphone
Microphones shall as a minimum conform to the following specifications:
Element: Dynamic
Pattern: Cardioid
Frequency Response: 50 - 12,000 Hz
Impedance: Low impedance mic (150-400 ohms)
Front-to-back Ratio: 20 dB
Selector switches: Selector switches for zone shall be
be [integral microphone] or [Separate
console adjacent to microphone]
2.6.2 Gooseneck Microphone
Gooseneck microphone shall meet the minimum requirements of the desk microphone. Microphone shall have push
to talk button. Gooseneck tube length shall be [305] [406] [_____] mm [12] [16] [_____] inch.
2.6.3 Microphone Jack
Each outlet for microphones shall consist of a standard outlet box, flush-mounted, and fitted with a three-pole,
polarized, locking-type, female microphone jack and a corrosion resistant-steel device plate.
2.7 LOUDSPEAKERS
NOTE: Indicate on drawings type of speaker and location. Horn Speaker shall
be specified only in areas with high ambient noise or outdoors. High output
speaker enclosures shall be restricted to large open spaces i.e. gymnasiums,
auditoriums or commons
2.7.1 Cone Speaker
The cone speaker shall as a minimum conform to the following specifications:
Application: [Wall baffle] [Ceiling]
Frequency range: 60 to 12,000 Hz
Power Rating: Normal - [7] [_____] watts
Peak - [10] [_____] watts
Voice Coil Impedance: 8 ohms
Line Matching
Transformer Type: 25/ 70.7 volt line
Capacity: 4 watts
Magnet: 10 ounces or greater
Primary Taps: 0.5, 1, 2 and 4 watts
Primary Impedance: 25 volts - 1250, 625, and 312 ohms
70.7 volts - 10k, 5k, and 2.5k ohms
Frequency Response: 30 - 20,000 Hz
Insertion Loss: Less than 1 dB
2.7.2 Horn Speaker
The horn speaker shall as a minimum conform to the following specifications:
Application: [Indoor] [Outdoor] [Weatherproof]
Frequency Response: 400 - 14,000 Hz
Power Taps: 70 volt line - .9, 1.8, 3.8, 7.5,
and 15 watts
Impedance: 5000, 2500, 1300, 670, 330, 90, and 45 ohms
Power Rating: Normal - [ 7] [_____] watts
Peak - [15] [_____] watts
Dispersion: 110 degrees
2.7.3 Dual Horn Speaker
The dual horn speaker shall meet the minimum requirements of horn speaker except the dispersion shall be 100
degrees.
2.7.4 High Output Speaker Enclosures
High Output speaker enclosures shall be of the tuned-port design for precise balancing and tuning of the speaker.
The enclosures shall be constructed throughout of 19.1 mm 3/4 inch high density board, with screwed and glued
joints, durably braced, and padded with fiberglass where acoustically required. Speaker enclosures shall have
a [25] [45] degree [_____] vertical dispersion and [90] [120] degrees [_____] horizontal dispersion. The effective
length of throw shall be a minimum of [15] [40] [60] [_____]m[50] [130] [200] [_____] feet.
2.7.5 Wall Baffle Speaker Enclosures
The wall baffle speaker shall be of particle board construction covered with [walnut laminate] [_____] and complete
with [black] [_____] cloth grille. Baffle shall feature 9.5 degree slope to provide directional sound dispersion
offset in the direction of radiation. Wall baffle enclosure shall come equipped with a wall mounting bracket
designed to assure a rigid mounting to any flat surfaces.
2.7.6 Ceiling Speaker Enclosures
Ceiling speaker enclosure shall be constructed of heavy gauge cold steel with interior undercoating and 38 mm
1-1/2 inch thick high density fiberglass 24 kg/cu. m 1-1/2 lbs/cu. ft. The unit shall be [round] [square] and
designed for [recessed] [surface] installations which will be accomplished via [standard screw] [torsion spring]
[flange mount] mounting. Recessed models shall have a rust-preventive, [textured black coating] [_____] and
the surface mount unit finished in textured [white] [_____]. Enclosure shall include four triple compound conduit
knockouts.
2.8 SPEAKER SWITCHING PANEL
NOTE: Delete if paging function is not required. Show zone boundaries on the
drawings.
2.8.1 Selector Switches
Zone control shall be provided for the paging function. The speaker switching panel shall contain at least [_____]
double-pole, [[4-] [3-] position] [push button] selector switches and shall be [rack-mounted] [desk mounted]
[selector switches built in microphone]to activate priority relays. Selector switches labeling shall be provided
to identify the zones.
2.8.2 System Power supply
Power supply shall be provided for priority relays and controls, rack-mounted and sized for a capacity equal
to 200 percent of the as-built control system, and shall operate at 24 Vdc. Input and output shall be protected
to permit Class 2 wiring in accordance with NFPA 70.
2.9 AM/FM EQUIPMENT
2.9.1 AM/FM Tuner
AM/FM tuner shall be rack-mounted and shall as a minimum conform to the following characteristics:
Tuning Range: AM - 540 to 1605 kHz
FM - 88 to 108 MHz
Selectivity: 60 dB on FM
40 dB on AM
Sensitivity: FM - 1.5 microvolts
AM - 2.0 microvolts
Capture Ratio: 1.0 dB
Readout/selection: Digital
Other features: Phased Lock Loop (PLL)
Power Requirement: 110-125 Vac, 60Hz
2.9.2 AM/FM Antenna
NOTE: In remote reception areas, an RF preamplifier may be required to receive
sufficient FM radio stations.
The AM/FM antenna shall be roof-mounted, either combined and suitable for both AM and FM reception or separate
AM and FM antennas and shall cover all frequency bands specified for radio tuners. [The antenna system shall
be coordinated with the TV system and other systems with antenna communication.] The system shall be furnished
complete with a transformer, insulators, crossover insulator, cable of proper length, lightning arresters, coupling
transformer and divider network at the radio tuners.
2.10 COMPACT DISC PLAYER
NOTE: Multi-disc players utilize a carousel or magazine which will hold and
load 5 inch disc for extended unsupervised play.
Player shall have three beam laser pickup, dual Digital-to-Analog converters, random access and random mode programmable
playback. [Player shall have capability to play a minimum of [5] [6] [_____] discs automatically.] Player
shall as a minimum conform to the following:
Frequency: 10 - 20,000 Hz Plus or Minus 1 dB
Signal-to-Noise: Minimum of 100 dB
Dynamic Range: Minimum of 96 dB
Total Harmonic
Distortion: Maximum of 0.005% at 1 KHZ
Channel Separation: Minimum 100 dB at 1 KHZ
Quantization: Minimum of 18 Bits Linear per channel
Conversion Rate: Minimum 8 x Oversampling
Disc Size: 5 inch
Power Requirement: 110-125 Vac, 60Hz
2.11 CASSETTE TAPE EQUIPMENT
The [dual] cassette tape play deck shall as a minimum conform to the following specifications:
Frequency Response: Plus or minus 3 dB, 20 - 20,000 Hz
Wow and Flutter: Less than 0.09 percent WRMS
Signal-to-Noise: 74 dB
Noise Reduction system: Dolby [B] [C] [S] [HX PRO]
Play Head: Hard Parmalloy
Operation: Automatic Reverse
Power Requirement: 110-125 Vac, 60 Hz
2.12 PRIORITY RELAYS AND CONTROLS
Provide priority relays and controls required to accomplish operations specified. Relays shall be completely
enclosed with a plastic dust cover for maximum protection against foreign matter, and shall be plug-in type.
Relays shall be provided with a diode wired across the relay coil for transient suppression and shall be installed
utilizing factory-prewired, rack-mounted receptacle strips. Coil shall be maximum 24 volts dc.
2.13 SWITCHES AND CONTROLS
2.13.1 Radio System Control Switch
NOTE: The multi-channel radio system described is only applicable for hospital
and medical facilities and should be specified only where required.
Provide the loudspeaker in each room, or group of speakers in a room, with a flush program channel selector rotating-switch
knob. The switch shall be mounted at location and height above the floor [as shown] [_____] and in accordance
with Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Install a volume control with a switch at each station of
the auto transformer type and set so that the maximum volume is sufficient for the area while not disturbing
adjacent areas. If music is turned down or off, the paging signal shall override controls except speakers designated
for music only. [Each device plate shall be satin-finished, corrosion-resisting steel permanently marked to
indicate the channel selected.] [In neuropsychiatric nursing units, control switches for individual speakers
will not be required, but one switch and volume control shall be installed at the Nurses Control Station.]
2.13.2 Remote Loudspeaker ON/OFF Switches
NOTE: If more than one switch is required, indicate in a schedule on the drawing.
Remote switches shall be [key-operated] [toggle switch] 2-pole, wall-mounted, single gang type with engraved
switch plates finished to match the approved finish of electrical wall switches. Low-voltage priority override
relays shall be provided as part of the switches with all wiring to the racks to allow override of the ON/OFF
switches for priority announcements.
2.13.3 Remote Loudspeaker Volume Controls
NOTE: If more than one control is required, indicate in a schedule on the drawing.
Remote volume controls shall be an auto transformer type with detented 3 dB steps and an OFF position. The controls
shall be wall-mounted in single-gang outlet boxes and furnished with engraved switching plates finished to match
approved finish of electrical wall switches. Insertion loss of the controls shall not exceed 0.6 dB and the
power-handling capacities of the control shall be [10] [35] [75] [_____] watts. Low-voltage priority override
relays shall be furnished as part of these controls with all wiring to the racks to allow override of the volume
controls for priority announcements.
2.14 EQUIPMENT RACKS
NOTE: For low powered systems i.e. only paging systems,specify perforations
or louvers for cooling through convection currents. Systems that are continiously
powered i.e. music or radio broadcast and total amplifier capacity exceeding
400 watts use top rack mounted fan option.
Equipment shall be mounted on 482.6 mm 19 inch racks in accordance with CEA-310-E and located as shown on drawings.
Ventilated rear panels, solid side panels, and solid top panels shall be provided. Equipment racks shall be
provided with lockable front panels that limit access to equipment. The lockable front shall not cover items
that require operator access such as am/fm tuner, CD player, or tape player. Rack cooling shall be through [perforations
or louvers in front panels to ensure adequate ventilation of equipment] [top rack mounted fan]. The racks and
panels shall be factory finished with a uniform baked enamel over rust inhibiting primer.
2.15 CABLES
2.15.1 Speaker Cable
Cables shall be of the gauge required depending upon the cable run length. In no case shall cable be used which
is smaller than 18 AWG. Insulation on the conductors shall be polyvinyl chloride (PVC) or an equivalent synthetic
thermoplastic not less than 0.2 mm 0.009 inch. Cables shall be jacketed with a [PVC] [Fluoropolymer] compound.
The jacket thickness shall be 0.5 mm 0.02 inch minimum.
2.15.2 Microphone Cable
Cable conductor shall be stranded copper 20 AWG. Insulation on the conductors shall be polyvinyl chloride (PVC)
or an equivalent synthetic thermoplastic not less than 0.2 mm 0.009 inch. Cable shall be shielded 100% of aluminum
polyester foil with a bare 22 gauge stranded soft copper drain conductor. Cables shall be jacketed with a [PVC]
[Fluoropolymer] compound. The jacket thickness shall be 0.5 mm 0.02 inch minimum.
2.15.3 Antenna Cable
Antenna coaxial cable shall have 75 ohm plus or minus 2 ohm. Attenuation of the coaxial cable span between the
antenna and amplifier shall not exceed 2.5 dB at 108 MHz.
2.16 TERMINALS
Terminals shall be [solderless, tool-crimped pressure] [or] [_____] type.
2.17 SURGE PROTECTION
2.17.1 Power Line Surge Protection
Major components of the system such as power amplifiers, mixer-preamplifiers, and tuners, shall have a device,
whether internal or external, which provides protection against voltage spikes and current surges originating
from commercial power sources in accordance with IEEE C62.41.1/IEEE C62.41.2 B3 combination waveform and NFPA 70
. Fuses shall not be used for surge protection. The surge protector shall be rated for a maximum let thru voltage
of 350 Volts ac (line-to-neutral) and 350 Volt ac (neutral-to-ground). Surge protection device shall be UL listed
and labeled as having been tested in accordance with UL 1449.
2.17.2 SIGNAL SURGE PROTECTION
Major components of the system shall have internal protection circuits which protects the component from mismatched
loads, direct current, and shorted output lines. Communication cables/conductors shall have surge protection
installed at each point where it exits or enters a building.
2.18 TELEPHONE INTERFACE MODULE
NOTE: Telephone Interface module may be used to access PA system from telephone
in conjuction or lieu of microphone. If there is a requirement to integrate
Telephone Interface module to the PA system, assure that the necessary inputs
and interfaces are included in this specification.
Telephone Interface module shall provide one way all call paging access from telephone to PA system. Paging
shall be accomplished by the building telephone system instruments interconnected to the PA system via an interface
module to allow telephone dial up access to the paging amplifier. Interface module shall produce an alert tone
in the associated speakers on activation. Telephone interface module shall as a minimum conform to the following specifications:
Impedance: 600 ohms
Frequency response: 100Hz to 10Khz
70V Input Impedance: 200K ohms
Output level: 400mV rms
Input Power Requirement: 12-24Vdc (from power supply)
Access requirement: Electronic (analog) or IA2 line key (line card required)
PABX loop or ground-start trunk port, or dedicated single-line phone.
PART 3 EXECUTION
3.1 EXAMINATION
After becoming familiar with the details of the work and working conditions, verify dimensions in the field,
and advise the Contracting Officer of any discrepancies before performing the work.
3.2 INSTALLATION
Equipment shall be installed as indicated and specified, and in accordance with the manufacturer's recommendations
except where otherwise indicated. Equipment mounted out-of-doors or subject to inclement conditions shall be
weatherproofed. The antenna shall be supported at least 1.5 m 60 inch clear above the roof by means of self-supported
or guyed mast.
3.2.1 Equipment Racks
NOTE: Racks be located adjacent to walls. If a mechanical rack/floor attachment
is required, controls shall not be lower than 762.0 mm (30 inches) nor higher
than 1.7 m (66 inches) above floor; CD, Cassette player and Tuner shall not
be lower than 1220 mm (48 inches) nor higher than 1524 mm (60 inches) above
floor.
Racks shall be mounted side-by-side and bolted together. Items of the same function shall be grouped together,
either vertically or side-by-side. Controls shall be symmetrically arranged at a height as shown. [CD, Cassette
& Tuner shall be at a height above the floor as shown.] Audio input and interconnections shall be made with
approved shielded cable and plug connectors; output connections may be screw terminal type. All connections
to power supplies shall utilize standard male plug and female receptacle connectors with the female receptacle
being the source side of the connection. Inputs, outputs, interconnections, test points, and relays shall be
accessible at the rear of the equipment rack for maintenance and testing. Each item shall be removable from
the rack without disturbing other items or connections. Empty space in equipment racks shall be covered by blank
panels so that the entire front of the rack is occupied by panels.
3.2.2 Wiring
Install wiring in rigid steel conduit, intermediate metal conduit, cable trays, or electric metallic tubing as
specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Wiring for microphone, grounding, line level, speaker
and power cables shall be isolated from each other by physical isolation and metallic shielding. Shielding shall
be terminated at only one end.
3.3 GROUNDING
All grounding practices shall comply with NFPA 70. The antenna mast shall be separately grounded. Equipment
shall be grounded to the serving panelboard ground bus through a green grounding conductor. Metallic conduits
serving the equipment shall be isolated on the equipment end with an insulating bushing to prevent noise from
being transferred to the circuit. Equipment racks shall be grounded to the panelboard ground bus utilizing a
#8 conductor. Grounding conductor shall be terminated to the rack using connector suitable for that purpose.
3.4 TRAINING
Conduct a training course for [_____] members of the operating and maintenance staff as designated by the Contracting
Officer. The training course will be given at the installation during normal working hours for a total of [_____]
hours and shall start after the system is functionally complete but prior to final acceptance tests. The field
instructions shall cover all of the items contained in the approved operating and maintenance manuals, as well
as demonstrations of routine maintenance operations. Notify the Contracting Officer at least 14 days prior to
the start of the training course.
3.5 ACCEPTANCE TESTS
After installation has been completed, conduct acceptance tests, utilizing the approved test procedures, to demonstrate
that equipment operates in accordance with specification requirements. Notify the Contracting Officer [14] [_____]
days prior to the performance of tests. In no case shall notice be given until after the Contractor has received
written Contracting Officer approval of the test plans as specified. The acceptance tests shall include originating
and receiving messages at specified stations, at proper volume levels, without cross talk or noise from other
links or nondesignated units.