Swapping out a commercial office building full of 2x4 lights in drop ceiling to new 2x4 LED fixtures. Some of these lights are on an emergency circuit and contain two ballasts in the light. My LED fixtures I’m replacing don’t have ballasts obviously. One of the ballasts on the previous light...

When I replace a hard wired emergency lighting unit should I change the supply circuit to the area lighting circuit in order to meet the requirements of rule 46-304(4)? is there a grandfather clause? if so, where is it written? thanks in advance, ISmith - Jman elec.