Electrical Code…
- Dwelling Unit
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A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
- One-Family Dwelling
- Two-Family Dwelling
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A building that consists solely of two dwelling units
- Multifamily Dwelling
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A building that contains three or more dwelling units.
(National Electrical Code® 100-1)
Mechanical Code…
A building or portion thereof that contains not more than two dwelling units.
A building or portion thereof that contains living facilities, including provisions for sleeping, eating, cooking, and sanitation, as required by this code, for not more than one family.
(Uniform Mechanical Code® 206.0)