First of all I must say to forgive my ignorance. I am stronger on the OSHA side of things than the NEC side.
OSHA has a provision in LOTO that if it is a cord operated machine, and you are in sole possession of the cord, you do not have to lock out the machine. So if you are working on a dishwasher and you unplug it, do the work, and then plug it back in you are in compliance with OSHA. However you cannot leave the dishwasher while you are working on it. If you did leave the dishwasher then you would have to lock it out.
Unfortunately I am in California and Cal/OSHA does not have this provision. All machines must be locked out when they are being serviced. Even if you remove the fuses you have to lock the fuse box.
Like I said this is from the OSHA side of things. You need to check if your state has it's own OSHA, 23 state have their own OSHA programs, and see what their provisions for LOTO are. In fact in CA it is not called LOTO, it is called Lock Out Block Out.
Sorry for being so wordy.
Scott
