Small and MediumThe small and medium freeze dryers can be connected to a standard 110-volt outlet.You'll need a dedicated 20-amp circuit for these models.LargeFor the large freeze dryer, a 110-volt outlet with a NEMA 5-20 configuration is required.A dedicated 20-amp circuit is also necessary for the large unit.X-LargeThe extra-large freeze dryer, like the large model, requires a 110-volt outlet with a NEMA 5-20 configuration.Just like the large unit, the extra-large model needs a dedicated 20-amp circuit for proper operation.