How should automatic dispensers be installed in terms of grade?

The installation of automatic dispensers should be conducted at a height that is 6 inches above normal grade. This requirement is primarily for safety and accessibility reasons. By positioning the dispensers at this height, it helps to facilitate proper drainage away from the dispensing area, reducing the risk of water accumulation that could pose hazards or interfere with the safe use of the equipment.

This elevation also enhances accessibility for users regardless of whether they are in vehicles or approaching the dispenser on foot. Furthermore, it aligns with best practices in ensuring that any spills or leaks can be managed effectively and do not create a dangerous environment.

The other options suggest either being below, above, or at grade level, which does not adequately address these concerns for safety and functionality, making them less appropriate for the installation of automatic dispensers.