Adding a 3/4-wire 220v receptacle
Because you selected a 25A breaker, you will need to use 10AWG wire for the branch circuit.  

NEC has a table of which receptacles are permitted on which sizes (amperages) of circuit.  Nothing in the NEC authorizes any kind of receptacle on a 25A breaker.  It will exceed the capacity of a 20A receptacle.  A 30A receptacle will allow plugging in things which draw more than 25A.  No receptacle will work.   As such, all loads will need to be hard-wired. 

An additional rule says that if the sum of all hard-wired loads exceed 50% of the total circuit ampacity, then no receptacles are allowed on that circuit.

I have no earthly idea why you bought a 25A breaker.  But when I was first learning, I bought a stack of 30A 1-pole breakers reasoning that surely they must have a use - and then I never found one, except for a TT30 RV connector.  So welcome to the club. 

Normally on a circuit of ampacity X, all sockets on that circuit must be of ampacity X.  

On a 30A circuit, there can be any number of receptacles, but they all must be 30A.   

A 20A circuit can have any mix of 15A or 20A receptacles, unless there is only one socket, and then it must be 20A.  This is due to a special exception in Code, you cannot mix-and-match socket sizes otherwise. 

If I were you, I would take back the 25A breaker and get a 30, then 10AWG wire to (daisy chained) a 14-30 and 6-30 receptacle, modify both cords to have a -30 socket on it, and done. 

I wouldn't try to make it work on a 20A receptacle, you're overamped - the dust collector is a continuous load so 6A * 1.25 derate = 7.5A + 13A saw = 20.5A -- too much for a 20A breaker. 

Actually, if I were you...

I would take back the 25A breaker... and get the gear to put a subpanel in the wood shop.  My motivating factor would be the shortage of space in your main panel. 


a 60A breaker
4AWG Al wire /3 with ground
A subpanel of good quality, e.g. Siemens, CH, QO etc. with 20 or more spaces.  I don't care the ampacity of the subpanel as long as it's >=60.  It needs a main breaker if it's in an outbuilding.  
Ground bar accessory kit (any respectable panel will come with this) 
two 20A/240V breakers for that subpanel type
20A/120V breakers as desired
A bit of 12/2 and 12/3 wire  (or THHN if in conduit)
A NEMA 6-20 duplex socket (can be 6-15 if duplex)
A NEMA 14-20 socket
NEMA 5-15 or 5-20 sockets as desired
Necessary boxes, conduit, etc. 


The 6-15/20 duplex receptacle is for the saw and whatever else.  The 14-20 single (they don't come in duplex) is for the dust collector. 14-20 is a common receptacle type, 14-15 exists but nobody stocks it.   The common-as-dirt 5-15s or 5-20s are for all your 120V tools.  I assume you already have a circuit coming in to supply those, serve it out of this subpanel.  Pro tip: leave the lighting served out of the main panel, that way if you trip the subpanel breaker the lights do not go out.