120 V and NEMA plug architecture
The US, Canada and Mexico all use a nominal 120 V supply with NEMA 1-15 (two-prong) and NEMA 5-15 (grounded) plugs and receptacles. Most household and office power strips are built around a 15 A plug. The electrical rating of the finished strip (for example 125 V, 10 A, 1250 W) must follow the approved design and is not the same as the rating of the wall circuit.