Sec. 80.815  Installation of radiotelegraph auto alarm.

    Installation of a radiotelegraph auto alarm must comply with the 
following conditions.
    (a) The auto alarm must be located in the radiotelegraph operating 
room and be installed and protected to insure proper operation. The 
radiotelegraph auto alarm system must be operated from the 
radiotelegraph operating room. A switch must be provided to:
    (1) Transfer the main antenna from all other equipment and connect 
it to the radiotelegraph auto alarm receiver and place the auto alarm in 
service and, back to the original configuration A voltmeter must be 
provided for the determining that the supply voltages are within the 
operating limits.
    (2) [Reserved]
    (b) The auto alarm must give an audible warning in the 
radiotelegraph operating room, in the radio officer's cabin, and on the 
navigating bridge. The alarm must operate continuously after the alarm 
has been actuated by a radiotelegraph alarm signal or by failure of the 
system, until manually turned off. Only one switch for stopping the 
alarm is authorized, and this must be located in the radiotelegraph 
operating room and be capable of manual operation only. However ships 
operating under the general exemption of Sec. 80.836(c) may install an 
additional switch on the bridge for stopping the warning apparatus.
    (c) Failure of the auto alarm if of a type approved prior to July 
23, 1951, to function normally due to prolonged interference must 
operate a visual indicator on the bridge. The type and method of 
installation of such visual indicator must comply with the requirements 
of the U.S. Coast Guard.

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    (d) The power supply voltage of an auto alarm must be maintained 
within definite upper and lower limits. The power supply must have an 
auxiliary device which:
    (1) Will energize the alarm if this power supply fails or its 
voltage exceeds the limits specified for the particular type of auto 
alarm involved; or
    (2) Will automatically connect the auto alarm to an auxiliary power 
supply, the voltage of which is within the specified limits.