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In the context of the National Electrical Code (NEC), receptacle outlets in certain types of occupancies, particularly in non-dwelling units, are typically calculated differently than those in residential settings. For "other than dwelling" occupancies, such as commercial or industrial spaces, each receptacle outlet is required to be calculated at not less than 180 volt-amperes (VA) due to the use and load demands of various electrical devices and equipment found in those environments.

This requirement ensures that the electrical system is designed to handle the potential maximum load of receptacles in these types of buildings, providing a safe and adequate supply of electricity for the diverse and sometimes heavy-duty usage that can occur. Given that commercial and industrial spaces can frequently host multiple users and a variety of equipment that draws substantial power, this higher VA calculation is essential for ensuring safety, compliance, and operational efficiency.

In contrast, dwelling units, while also having receptacle outlet requirements, generally have lower calculation values primarily reflecting the average load expected from residential appliances. This distinction in calculation reflects the differing characteristics and needs of residential versus non-residential environments concerning electrical consumption.