NEC 2026 110.16 will require labels on non-swelling unit service and feeder equipment. The new language reads:
"In other than dwelling units, a permanent arc flash marking must be applied to service and feeder equipment such as switchboards, enclosed panelboards, and meter socket enclosures. The arc flash hazard marking must be permanently affixed to the equipment and cannot be handwritten in accordance with sec. 110.21(B), be clearly visible to a qualified person, and be installed in accordance with applicable industry practices containing the following information: (1) nominal system voltage; (2) arc flash boundary; (3) Available incident energy or minimum required level of PPE; (4) date the assessment was completed."
In my opinion, a sub-panel would not qualify as "service and feeder equipment" - would you agree?
I'm at a place that builds mobile/modular buildings and we usually install a sub-panel that later gets fed from a meter main or distribution panel, depending on where the building site is. I'm trying to wrap my head around this new NEC requirement to decide if we need to label our sub-panels or not. I welcome your opinions.
"In other than dwelling units, a permanent arc flash marking must be applied to service and feeder equipment such as switchboards, enclosed panelboards, and meter socket enclosures. The arc flash hazard marking must be permanently affixed to the equipment and cannot be handwritten in accordance with sec. 110.21(B), be clearly visible to a qualified person, and be installed in accordance with applicable industry practices containing the following information: (1) nominal system voltage; (2) arc flash boundary; (3) Available incident energy or minimum required level of PPE; (4) date the assessment was completed."
In my opinion, a sub-panel would not qualify as "service and feeder equipment" - would you agree?
I'm at a place that builds mobile/modular buildings and we usually install a sub-panel that later gets fed from a meter main or distribution panel, depending on where the building site is. I'm trying to wrap my head around this new NEC requirement to decide if we need to label our sub-panels or not. I welcome your opinions.