A 42- space panel is supplied from a 480Y/277V, 3-phase four-wire system. Three

Question

A 42- space panel is supplied from a 480Y/277V, 3-phase four-wire system. Three phase conductors, the neutral, and the equipment-grounding conductor are brought to the panel. The overcurrent devices in the panel, excluding the main, consists of 9 three-pole, 30 A breakers supplying branch circuits consisting of three ungrounded conductors and an equipment grounding conductor. In addition, there are two 20 A, single-pole breakers protecting branch circuits supplying 277V lighting circuits. Is this panel classified as a power panelboard or an appliance and branch circuit panelboard?

Explanation / Answer

A 42- space panel is supplied from a 480Y/277V, 3-phase four-wire system. Three phase conductors, the neutral, and the equipment-grounding conductor are brought to the panel. The overcurrent devices in the panel, excluding the main, consists of 9 three-pole, 30 A breakers supplying branch circuits consisting of three ungrounded conductors and an equipment grounding conductor. In addition, there are two 20 A, single-pole breakers protecting branch circuits supplying 277V lighting circuits. Is this panel classified as a power panelboard or an appliance and branch circuit panelboard?

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