Insulating rubber mats are designed for the use as a floor covering for the protection of workers on AC (alternate current) DC (direct current) installations with the system voltages up to 66kV AC and 240V DC, in accordance with Bureau of Indian Standard IS 15652 : 2006, which supersedes previous IS 5424 of 1969. The upper surface will have small aberration for anti-slip and the lower surface will be plain to set on the floor. Unless otherwise specified, the colour of the rubber mat will be black or blue.