Four post lifts can be had with either a 120V pump or a 220/240V pump - I highly recommend the 220/240V versions I have a 2 challenger lifts one 2-post and one 4-post both are 220/240V and are wired with #10-4 wire / 30 amp breaker and a four prong twist plug in the wall - that is what was required by code in our area as it is considered a commercial equipment install - you could direct wire from a junction box if you don't want a plug in wall outlet. The reason for the four wire is if you add accessory panels on the lift like an outlet panel - I have the plug and air panel on my two post and is real handy