Heavy machinery often depends upon connection to a 3 phase power supply. Some platform lifts will also require this type of power supply. Before committing to the purchase of a lift, be sure that you have 3 phase available in your building as adding it at a later date will undoubtedly prove disruptive and expensive. Whilst some heavy duty platform lifts have to have a 3 phase supply in order to lift the required load, others can be supplied with a device called an inverter (for an additional cost) which will then allow a single phase supply to be used. If you are not sure then always ask before committing to a purchase.