A-A-50627
2.2.2 Watertight enclosure. An enclosure constructed so that a stream of water form a hose not less than 25.4 millimeters (mm) in diameter under a head of 11 meters (m) from distance of 3m can be played on the enclosure from any direction for a period of 15 minute without leakage. The hose nozzle shall have a uniform diameter of 25.4 mm (see IEEE 45).
2.2.3 Explosionproof enclosure. Explosionproof enclosures shall be approved for operation in accordance with NFPA 70, class 1, group D, division 2, hazardous areas.
2.2.4 Grounding and bonding. Metallic enclosures shall be approved stud for grounding and bonding. Resistance between tip of the stud and any point of the enclosure or any exposed metallic components shall be zero ohms when measured with a high quality ohmmeter. The stud shall be placed on the left side of the enclosure when viewed from the front of the bell.
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.
2.4 Types. Bells shall be of the following types:
|
Size |
Output |
|
76.2 mm |
73 decibel (dB) |
|
203.2 mm |
85 dB |
|
Cowbell |
85 dB |
Sounds pressure output shall be based on a reference of 20 micropascal (µPa), and shall be measured at a distance of 3m from the bell in accordance with ANSI S1.13.
2.5 Construction. Construction shall be such that no special tools are required for disassembly or assembly.
2.6 Power. Operating voltages and frequencies shall be 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 resistance material or material treated in a satisfactory manner to render them adequately resistant to corrosion.
3.1 Contractor Certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this Commercial Item Description, and that the product conforms to the producers own drawings, specifications, standards and quality assurance practices. The government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract.
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