North American voltage supply networks and load types

North American voltage supply networks and load types

North American voltage supply networks and load types

Electrical networks within North America supply power to residential, commercial, and industrial structures. Depending on the amount of power required for a given installation, various voltage configurations can be utilized.

North American voltages

North American commercial installations are typically supplied using either 120/240 V AC split (dual) or 208Y/120 V AC, 3-phase wye networks. Industrial installations within the U.S. commonly use 480Y/277 V AC, 3-phase wye networks. For Canada, the network voltages are increased to 600Y/347 V AC. 3-phase delta networks, which do not offer a line-to-neutral voltage, are also common, most often supplying either 240, 480 or 600 V AC.

Manual motor starters are commonly applied in both industrial and commercial applications. To meet the requirements for North America, they are suitable for use on 1- and 3-phase networks with line-to-line voltages up to 600 V AC.

Three-phase network configurations

North American 3-phase supply networks differ based on the secondary winding of the upstream transformer. The two most common secondary winding styles are wye, which includes three power legs and a neutral, and delta, which includes only three power legs without a neutral connection. These networks can be either grounded or ungrounded.

Solidly grounded wye and ungrounded delta networks are most common in North America.

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