warning signs free CAD drawing incidences 2 different design which includes this shall be fitted where multi gang lighting switches or two lighting switches on different phases are closer than arms reach in conjunction with safety sign shown in fig. 1. it must be affixed adjacent so that it is clearly visible. and secondly shows triangular bar shall be black in the symbol shall be black and placed centrally on the background. Yellow shall cover at least 50% of the area of the safety sign. download free warning and danger symbol CAD blocks DWG file.