SAE Class Ratings

Back-Up Alarms

Class
 Sound Level Peterson Alarm Numbers
A 112 dB(A) 784, 784-C
B 107 dB(A) 782
C 97 dB(A) 780, 781, 785, 786-97, 786-102
D 87 dB(A) 783
E 77 dB(A)
F Other

 

The Society of Automotive Engineers (SAE) has developed performance standards for electric back-up alarms that are intended for use on heavy construction machinery. This chart shows the decibel level established for each of six classes defined in SAE Standard J944. The sound level tolerance for each class is +/- 4 dB(A). Alarms conforming to SAE J944 must also meet additional criteria relating to sound frequency, temperature range and resistance to rain, vibration and corrosion.

 

 

STROBES

Class
Intended Function
1 Emergency Response
2 Warning
3 Identification

 

The Society of Automotive Engineers (SAE) has developed performance standards for strobe/warning lights. This chart shows the three classes defined in various SAE standards and their intended use. Each class is defined by specific photometric criteria for flash brightness and distribution that are too complex and numerous to be listed here. Strobes conforming to SAE standards must also meet additional criteria relating to housing durability, temperature range and resistance to rain, vibration and corrosion.