All symbols used in Fire Alarm Designs drawings are derived from NFPA 170, however for what ever reason, there has been a flood of different symbols used for water flow and valve supervisory switches. This is understandable since there are different tables in this edition that seem to represent the same thing...but the actual table used is what should be taken under consideration. Below are examples of the symbols taken from Table 6.7.1, Symbols for Signal Initiating Devices and Activation Switches, as these appear to be the most appropriate for use in a fire alarm design
drawing.
actual screen shot of page excerpt NFPA 170
CAD blocks created from NFPA
these symbols are found in a different table,
Table 6.4 Water Supply and Distribution Symbols
