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  | NFPA99 | 
  | CAN/CSA | 
  | A901 | 
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  | A902 | 
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  | A903 | 
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  | Level 1 | 
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  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | C.V.  | S  | L.A.  | R.A.  | R.V.  | 
  | a. Overcrank  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | O  | O  | 
  | b. Low Water Temperature  | X  | —  | X  | X  | X  | X  | —  | X  | O  | O  | X  | —  | X  | X  | X  | X  | —  | X  | X  | X  | X  | —  | X  | X  | X  | X  | —  | X  | O  | O  | X  | —  | X  | O  | O  | 
  | c. High Engine Temp. Prealarm  | X  | —  | X  | X  | X  | O  | —  | O  | —  | O  | X  | —  | X  | X  | X  | O  | —  | O  | O  | O  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | ⑤  | —  | X  | O  | O  | 
  | d. High Engine Temperature  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | O  | O  | 
  | e. Low Lube Oil Pressure Prealarm  | X  | —  | X  | X  | X  | X  | X  | O  | —  | O  | X  | —  | X  | X  | X  | O  | —  | O  | O  | O  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | ⑤  | —  | X  | O  | O  | 
  | f. Low Lube Oil Pressure  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | O  | O  | 
  | g. Overpeed  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | X  | X  | X  | O  | O  | 
  | h. Low Fuel Main Tank  | X  | —  | X  | X  | X  | O  | —  | O  | O  | O  | X  | —  | X  | X  | X  | X  | —  | X  | X  | X  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | ⑤  | —  | X  | O  | O  | 
  | i. Control Switch not set in Auto  | X  | —  | X  | X  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | X  | —  | X  | X  | X  | X  | —  | X  | X  | X  | —  | —  | O  | —  | O  | ⑤  | —  | —  | —  | —  | 
  | j. High Battery Voltage  | X  | —  | X  | —  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | X  | —  | X  | —  | X  | —  | —  | O  | —  | O  | ⑤  | —  | —  | —  | —  | 
  | k. Low VoltageBattery  | X  | —  | X  | —  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | X  | —  | X  | X  | X  | X  | —  | X  | —  | X  | —  | —  | O  | —  | O  | ⑤  | —  | —  | —  | —  | 
  | l. Lamp Test  | X  | —  | —  | —  | X  | X  | —  | —  | —  | —  | —  | —  | —  | —  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | 
  | m. Audible Alarm Silencing switch  | —  | —  | X  | X  | —  | —  | —  | —  | O  | —  | —  | —  | —  | —  | —  | —  | —  | X  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | O  | —  | —  | —  | X  | O  | —  | 
①  | n. Low Starting Air Pressure  | X  | —  | X  | —  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | 
①  | o. Low Starting Hydraulic Pressure  | X  | —  | X  | —  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | 
  | p. Air shutdown dampner when used  | X  | X  | X  | X  | X  | X  | X  | X  | O  | O  | —  | —  | —  | —  | —  | X  | X  | X  | —  | X  | ③  | ③  | X  | X  | X  | ③  | ③  | X  | O  | O  | ③  | ③  | X  | O  | O  | 
  | q. Remote Emergency Stop  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | —  | —  | —  | —  | —  | O  | —  | —  | —  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | —  | X  | —  | —  | —  | 
  | r. Low Coolant Level  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | X  | —  | X  | X  | X  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | 
  | s. Battery Charger AC Failure  | X  | —  | X  | —  | X  | O  | —  | O  | —  | O  | —  | —  | —  | —  | —  | —  | —  | —  | —  | —  | X  | —  | X  | —  | X  | —  | —  | O  | —  | O  | ③  | —  | —  | —  | —  | 
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KEY
C.V.: Control 
S:Shutdown of EPS
L.A.: Local Audible contacts.
R.A.: Remote Audible contacts.
R.V.: Remote Visual contacts.
X:Required
O:Optional
①: Items “N” or “O” apply only when applicable as a starting method.
②: NFPA99 requires an audible alarm for all alarm and shutdown functions. May be connected to L.A. contacts.
③: Air Damper Closed and is available on 
④: R.A. and R.V. relays not supplied in model A902 or A903, optional.
⑤: Circuits and indicators supplied without labels.
Table 
3