How far above electrical conduit buried 18 inches below grade must a warning tape be installed?

The appropriate installation height for warning tape above electrical conduit that is buried 18 inches below grade is determined by industry standards and safety regulations. The correct answer signifies that the warning tape should be placed 12 inches above the conduit. This height is established to ensure that the tape is clearly visible to anyone digging in the area, which helps to prevent accidental damage to the conduit and improve the safety of underground installations.

By placing the warning tape at this specified height, it acts as a reliable indication that there is electrical infrastructure beneath, alerting workers to exercise caution when using tools or machinery that may disrupt the ground. Additionally, consistent practices in the placement of warning tape help maintain uniformity in the field, making it easier for all trades and workers to recognize and heed these warnings effectively.

The other options do not adhere to the standard specifications, as they either place the tape too high or too low, which could increase the risk of inadvertent strikes to the buried conduit.