NAVY A-A-50628-1995 BUZZER ELECTRICAL SHIPBOARD《船只蜂鸣器》.pdf

1、A-A-50628 9999474 O366539 299 pEEl A-A-50628 9 February 1995 COMMERCIAL ITEM DESCRIPTION BUZZER, ELECTRICAL, SHIPBOARD The General Services Administration has authorized the use of this commercial item description for all Federal Agencies. 1. Abstract. This commercial item description covers various

2、 types of buzzers for alarm and signalling purposes on naval ships. 2. Salient characteristics. 2.1 Mounting. Buzzers shall be two-point vertically mounted as specified on figure 1. 2.2 Enclosure. Buzzers shall be watertight. Enclosure shall be tapped at the bottom for conduit or cable entrance. 2.2

3、1 WatertiFht enclosure. An enclosure constructed so that a stream of water from a hose not less than 25.4 millimeters (mm) in diameter under a head of 11 meters (m) from a distance of 3 m can be played on the enclosure from any direction for a period of 15 minutes without leakage. The hose nozzle s

4、hall have a uniform diameter of 25.4 mm (see IEEE 45). 2.2.2 Grounding and bonding. Metallic enclosures shall be provided with a Resistance between the tip and any point of the stud for grounding and bonding. enclosure or any exposed metallic components shall be zero ohms when measured with a high q

5、uality ohmmeter. The stud shall be placed on the left side of the enclosure when viewed from the front of the buzzer. I Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, SEA 03R42, Nava

6、l Sea Systems Command, 2531 Jefferson Davis Hwy, Arlington, VA 22242-.5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 6350 DISTRIBUTION STATEMENT A. Approved for public release; distributio

7、n is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-Ao50628 9999974 0366540 TOO A-A-50628 .406?.005 /- 10.312?a127 2 PL . i FIGURE 1. Mounting: dimensions. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without l

8、icense from IHS-,-,-A-A-50b28 9999974 OLbb54L 947 A-A- 50628 2.3 Electrical isolation. Electrical components shall be electrically isolated from the enclosure or any exposed metallic components. Electrical isolation shall be 100 megohm or greater when measured with a high quality, 500-volt megger. 2

9、4 Output. The output of the buzzer shall be 68 or 73 decibel (dB) as specified (see 6.1). Sound pressure output shall be based on a reference of 20 micropascal (pPa), and shall be measured at a distance of 3 m from the buzzer in accordance with ANSI S1.13. 2.5 Construction. Construction shall be su

10、ch that no special tools are required for disassembly or reassembly. 2.6 Power. Operating voltages and frequencies shall be as specified (see 6.1). Operating voltages shall be 6, 12, 24, or 115 volts direct current or root mean square (rms) plus or minus 15 percent and operating frequency shall be 6

11、0 or 400 hertz (Hz) plus or minus 5 percent. 2.7 Preservation. Parts shall be of suitable corrosion resistant material or materials treated in a satisfactory manner to render them adequately resistant to corrosion, 3. Quality assurance provisions. 3.1 Contractor certification. The contractor shall c

12、ertify and maintain substantiating evidence that the product offered meets the salient characteristics of this commercial item description and that the product conforms to the pro- ducers own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to r

13、equire proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. 3.2 Regulatorv reauirements. The offerer/contractor is encouraged to use recovered materials in accordance with Public Law 94-580 to the maximum extent p

14、ractical. 4. Preservation, PackaginE. - packinn. labeling. - and markinq. The preserva- tion, packaging, packing, labeling, and marking shall be as specified in the contract or order. 5. CID based part identification number. The following part identification numbering procedure is for Government pur

15、poses and does not constitute a require- ment for the contractor. A-A-50628 - 611A6 Example of part identification number. Variable characteristics 11 = operating voltage 6 = output level A = alternating current 6 = operating frequency CID number Designated commercial item description (CID) 3 Provid

16、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50628 9999974 OLhhSLi2 883 A-A- 50628 6. Notes. 6.1 Acauisition reauirements. Acquisition documents must specify the following: (a) Output. 6 - 68 dB 7 - 73 dB (b) Power. 06 = 6 12 - 12 24 = 24 11 = 115 D

17、 = Direct current A - Alternating current (rms) 6 = 60 HZ 4 - 400 HZ 6.2 Documents. (a) ANSI S1.13, Methods for Measurement of Sound Pressure Levels, is available from American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. board, is available from Institute of El

18、ectrical and Electronic Engineers, Inc., 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ (b) IEEE 45, Recommended Practice for Electric Installations on Ship- 08855-1331. CIVIL AGENCY COORDINATING ACTIVITY GSA - FSS Preparing activity: Navy - SH (Project 6350-0138) 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-