You must provide all saws with a sheet metal guard that is positioned to stop sparks. The guard must be constructed of at least one-eighth inch sheet metal.
Note:
It is advisable to provide all saws with a means to trap sparks below the saw and to use a tank of water below the saw to reduce the fire hazard.
Reference:
Other saw requirements may be found in, Saws and cutting heads, WAC 296-806-480.