NAVY A-A-50630-1995 HORN ELECTRICAL SHIPBOARD《船只电子喇叭》.pdf

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1、-1 A-A-50630 9 February 1995 COMMERCIAL ITEM DESCRIPTION HORN, 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 types of horns for alarm and sign

2、alling purposes on naval ships. 2. Salient characteristics. 2.1 Mounting. Horns shall be three-point vertically mounted as specified on figure 1. Mounting shall be as specified (see 6.1). 2.2 Enclosure. Horns shall be watertight. Enclosure shall be tapped at the bottom for conduit or cable entrance.

3、 2.2.1 Watertight 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 nozz

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

5、 a high quality ohmmeter. The stud shall be placed on the side of the enclosure. 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, Naval Sea Systems Command, 2531 Jefferson D

6、avis 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; distribution is unlimited. Licensed by Information

7、Handling ServicesA-A-50630 m 9999974 0366548 2T3 m A-A-50630 FIGURE 1 3 PL MOUNTING DIMENSION NOTE : MOUNTNG DIMENSON;Ifl 1. R3.000 2- R3-062 2. m 3- R39690 m 5.005 FIGURE 1. MountinP - dimensions. 2 Licensed by Information Handling ServicesA-A-50630 m 9999974 0366547 138 A-A-50630 2.3 Electrical is

8、olation. 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. 2.4 TvDe. Horns shall be of the following types, as specified (see 6.1): ZYlX F

9、reauencv OUtDUt Resonate 250 to 350 Hz 93 decibel (dB) Resonate 300 to 350 Hz 110 dB Nonresonate 100 to 600 Hz 93 dB Motor-operated 100 to 600 Hz 101 dB 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 horn in accordance

10、 with ANSI S1.13. 2.4.1 Motor-ODerated. The acoustical output of the motor-operated horn shall include a mixture of as many frequencies as possible. 2.5 Construction. Construction shall be such that no special tools are required for installation. 2.6 Power. Operating voltages and frequencies shall b

11、e as specified (see 6.1). Operating voltages shall be 6, 12, 24, 115, or 440 volts direct current or root mean square (rms) plus or minus 15 percent and operating frequency shall be 60 or 400 hertz (Hz) plus or minus 5 percent. 2.7 Preservation. Parts shall be of suitable corrosion resistant materia

12、l or materials treated in a satisfactory manner to render them adequately resistant to corrosion, 3. Oualitv assurance Drovisions. 3.1 Contractor certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this commer

13、cial 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 require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under th

14、e provisions of the contract. 3.2 Regulatory requirements. The offerer/contractor is encouraged to use recovered materials in accordance with Public Law 94-580 to the maximum extent practical. 4. Preservation. packaging. packina. labelinp. and marking. The preserva- tion, packaging, packing, labelin

15、g, 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 purposes and does not constitute a require- ment for the contractor. 3 Licensed by Information Handling ServicesA-A-50630 -

16、MlR944A4 Example of part identification number. Variable characteristics Ml = mounting dimensions R9 = type 44 - operating voltage . A = alternating current 4 - operating frequency CID number Designated commercial item description (CID) 6. Notes. 6.1 Acquisition requirements. Acquisition documents m

17、ust specify the following: (a) Mounting. Ml - R3.000 f 0.15 M2 = R3.062 f 0.15 M3 = R3.690 f 0.15 M4 = R3.312 f 0.15 (b) Type. R2 = Resonate 250 to 350 Hz 93 dB R3 = Resonate 300 to 350 Hz 110 dB N1 = Nonresonate 100 to 600 Hz 93 dB Ml = Motor-operated 100 to 600 Hz 101 dB 06 - 6 12 - 12 24 = 24 11

18、= 115 44 = 440 (c) Power. D = Direct current A = Alternating current (rms) C = Alternating or Direct current 6 = 60 HZ 4 = 400 HZ 6.2 Documents. (a) NFPA-70, National Electrical Code, is available from National Fire Protection Association, One Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101.

19、 available from American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. board, is available from Institute of Electrical and Electronic Engineers, Inc., 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ (b) ANSI S1.13, Methods for Measurement of Sound Pressure Levels,

20、is (c) IEEE 45, Recommended Practice for Electric Installations on Ship- 08855-1331. 4 Licensed by Information Handling ServicesA-A-50630 9999974 OLbb55L 896 m A-A-50630 CIVIL AGENCY COORDINATING ACTIVITY: GSA - FSS Preparing activity: Navy - SH (Project 6350-0140) 5 Licensed by Information Handling Services