I personally use common sense precautions; long sleeve cotton shirt and safety glasses, because I've seen too many things happen.Working on control circuits with
exposed energized electrical
conductors and circuit parts,
nominal 125 volts ac or dc,
or below without any other
exposed energized equipment
over nominal 125 volts ac or
dc, including opening of hinged
covers to gain access.
NFPA 70E-2018 is Table 130.7(C)(15)(a) which lists Category 1 for equipment rated 240V and below as long as the parameters of maximum available fault current is no greater than 25kA and the maximum clearing time is 2 cycles (0.03 sec) are met. So the OP would have to obtain the available, not infinite bus, fault current from the utility and model the system to the equipment to obtain the available fault current and then obtain the time current curve for the protective device upstream from that equipment to determine if it will trip in 2 cycles or less.According to this table under equipment rated 240v and below you need a Arc Flash PPE Category 1. Arc Flash Boundary 19in.
if you go to Table 130.7(C)(16) you will see what type of Clothing and PPE you are required as Category 1 on the previous table.