[Scan-DC] WSAD--a term you should know

[Jeff Krauss]

Warning Strobe and Alarm Device (WSAD). The Warning Strobe and Alarm 
Device (WSAD) is designed to give an audible and visual warning 
should electricity be detected in what should otherwise be 
de-energized third rail. This device isdesigned to be placed at a 
distance no greater than 500 feet from the end on the incident or emergency.
The WSAD will activate when installed on an energized third rail, if 
it is installed incorrectly, or if the batteries are low. The WSAD 
will also begin alarming at 50 to 60 volts, which is the same voltage 
that stray current has been measured.
WSAD's are carried by a variety of fire and rescue vehicles within 
the Metro Transit Region, as well as several Metro Transit Police 
vehicles. The Metro Transit Police Officers do not place the WSAD's 
in service; rather, they make them available should the fire and 
rescue service need additional units for the incident. Every incident 
requiring the WSAD will require a minimum of two units.