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200 feet of direct burial #6 copper will support 50 amps with a 4% voltage drop. The code recommends no more than 3% drop in a feeder. 40 amps would give you a 3.2% drop.
Your 5 HP motor
has a 28 amp draw and you are correct on the 2 HP at 12. For starting purposes you are going to need to start the planer with nothing else running. The starting current will spike to 168 amps momentarily and then drop back. Lighting is going to dim badly in the outbuilding. Flourescent may shut off and come back on. Starting the dust collector with the planer running will also dim your lights but not as badly.
You are really cutting this down below advisable levels with voltage drop included. You need a full 47 amp capacity to be code compliant and you can't get that without almost 5% voltage drop. Increase your 2 current conductors to #4 AWG and you will get 60 amps at 3% drop. This will take care of your needs. The motors don't use a neutral so that load is not critical. Run PVC conduit
all the way with 2 #4 and 2 #6 for ground and neutral and all will be good for your installation.
Where did you get the 50 amp and 30 amp breaker ratings? Were they in the equipment as minimum requirements?
We still have to size the feeder breaker to be enough for the entire building with lighting loads included.
This will give you the feeder requirements and suggestions, the breaker sizes will be in the next answer.
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