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Ed,

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A 20HP Phase Perfect may be overkill for your needs.??Paul provided the load handling curves earlier, but practical experience suggests to me that a 15HP unit will probably be more than sufficient unless you are planning on a huge WB in the future.??

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I have the older model 10HP Phase Perfect?connected to the shop single-phases load center via a 70 Amp breaker and #6 THHN wire in MT conduit.??The wiring to the 3-phase equipment is all #8 THHN in EMT. ?I have a 10HP Kappa 400 xMotion saw, 10HP Profil 45 shaper, 5.5HP RL160 dust extractor, 13 HP Dual 51 J/P, 7.5HP widebelt sander. ?

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The most demanding load is running the Dual 51, planning wide hardwoods at significant depths of cut, pushed to max feed rates.??My Dual 51 has the Tersa head, so I would expect the power demands are considerably higher than a spiral cutterblock, or even a larger tilt/turn cutterstack on the 13HP Profil 45.

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In real-world experience with this setup, I have surfaced 18” wide cherry at 4mm depth of cut with the RL160 also going, and the Phase Perfect handles it just fine.??I could even run the Kappa 400 in parallel for modest cutting.??All this with the 10HP Phase Perfect.

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My 3-phase shop wiring setup is shown below.??This is the 4^th?shop I have wired in this fashion.??I am not an electrician, but this type of setup has been 100 percent trouble free in all my shops.??As you can see, I didn’t not employ disconnects or breakers (other than the plugs) downstream from the Phase Perfect.??I'm sure there are lots of licensed electricians would love to take pot-shots at this setup, but this setup was done under permit and passed local building inspector in Portland OR, and San Rafael CA.