Each self-propelled ocean, Great Lakes, or coastwise vessel must have a manually-operated engineers' assistance-needed alarm that is:

1. (a) Operated from:

   1. (1) The engine control room, if the vessel has an engine control room; or
   2. (2) The maneuvering platform, if the vessel has no engine control room;
2. (b) Audible in the engineers' accommodation spaces; and
3. (c) Powered from the general alarm power source.