Mining Sign Caution Avoid Damage to High Voltage Trailing CableMining Sign Caution Avoid Damage to High Voltage Trailing Cable commonly used in the mining industry. The black caution header can appear on signs in a landscape format with black text and Class 2 or Class 1 reflective overlay in a landscape format. Complies with AS1319: 1994. All signs are available in steel or aluminium composite panel (ACP) with Class 2 or Class 1 reflective overlay.