scope:

Indicating Pressure Gauges for Fire-Protection Service

UL 393

1.1 These requirements cover indicating pressure gauges of the elastic element type intended for use with sprinkler or standpipe equipment for fire-protection service.

1.2 These requirements cover gauges of trade sizes 3-1/2 to 4-1/2 inches (90 to 115 mm), inclusive.

1.3 The gauges covered by these requirements are intended for installation and use according to the following Standards of the National Fire Protection Association:

a)     Standard for Installation of Sprinkler Systems, NFPA 13;

b)     Standard for Installation of Standpipe and Hose Systems, NFPA 14;

c)     Standard for Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24; and

d)     Standard for Installation of Stationary Fire Pumps for Fire Protection, NFPA 20.