Always check with your venue the number of power circuits that can be used for catering equipment.
Not all halls or homes can manage multiple appliances working at the same time without overloading the circuits. When this happens, it will stop the unit heating and can cause damage to the unit and can short out your house.
Your house has multiple circuits to help the electrical current stay small, reducing the risk of overloading the circuits. Some appliances, such as a dishwasher, airconditioner/heater or dryer, hot food bars, pie warmers, draw more power and may require their own circuit. We have had occasions when a customer has numerous items working, and they turn on our appliance and it shorts out their house. This is often not because there is a problem with the hired appliance...it is just because there was too much load on one particular circuit.
You should use only one power point for each heating unit per circuit.
To ensure a stress free function, it is always recommended to have a trial run of the heating appliances working together, prior to start time.