An employee was making neon signs. He was glass pulling, attained a vacuum in the tube, and pumped the tube with neon. The employee was charging the sign with electricity to check the level of illumination. The employee was trying to attain 300 milliamps in the tube. During bombarding, the milliamp meter malfunctioned and the employee tried to troubleshoot. An arc flash occurred and the employee was shocked and burned on his arms and hands. He also received a laceration to the right elbow and bruising on the right hand.