I am doing a job soon that will involve taking down old fan coil units and installing new ones where the old ones came out. Some of these were on 50 amp breakers with number 8 wire. All of the new ones are 30 amp heat coils. I am trying to find a code reference were I can still use the 50 amp breakers on the 30 amp units because the units are fused at 30 amps on the inside of the units themselves. All help is GREATLY appreciated