The phrase "external supply" is correct and usable in written English.
It is usually used to refer to something obtained from an external source or from outside the situation being discussed. For example: "We relied on external supply to meet our deadline."
He works in Parsippany, N.J., where he is the director of external supply for North America.
But the fact that the oxidizing bacteria also have an internal source of sulfide from their symbionts means that they are not dependent on an external supply.
This means, partly, diversifying sources of supply from outside Europe and putting right the government's failure to ensure we have sufficient gas storage to withstand external supply shortages.
The continued growing of seedlings requires the external supply of resources from photosynthesis.
The PPs supply has been through domestic crude refining capacities and from external supply.
Liquid propellants are fuels which do not require external supply of oxygen for combustion.
The logic levels can be easily adjusted with an external supply voltage so that the circuit design is significantly simplified.
Finally, results showed that photosynthetic scaffolds are capable of producing enough oxygen to be independent of external supply in vitro.
eLogistics refers to the usage of Information and Communication Technology (ICT) in the logistics processes of internal and external supply chains.
Intensively exploited soils need an external supply of stabilized organic matter, such as compost, in order to counteract progressive SOM decline.
It is possible for a mill to exist without an external supply, provided water circuits in the mill are carefully managed (Nakane and Haidary 2010).
