Is it permissible to use a series-rated combination in a new system installation if there is no evidence the panelboard manufacturer has the panelboard listed and marked for the specific OCPD combination?

Is it permissible to use a series-rated combination in a new system installation if there is no evidence the panelboard manufacturer has the panelboard listed and marked for the specific OCPD combination?

• A. True
• B. False
• C. Only with written consent from the manufacturer
• D. It depends on the system voltage

Answer: (B)

Panelboards must be used only with OCPD combinations that the manufacturer has listed and labeled for that specific panel. A series-rated pairing is not something you can assume is acceptable unless the listing explicitly covers it. If there’s no evidence that the panelboard is listed and marked for that exact OCPD combination, using it in a new installation would mean the equipment is not installed per its listed approval, which can create unsafe conditions and violate the listing requirements. The test data and safety assurances provided by the listing apply only to the combinations it covers; without that coverage, you can’t rely on the pairing being safe or permitted. If the manufacturer provides a documented listing/marking that includes the desired combination, then it would be permissible; otherwise, it is not.

Panelboards must be used only with OCPD combinations that the manufacturer has listed and labeled for that specific panel. A series-rated pairing is not something you can assume is acceptable unless the listing explicitly covers it. If there’s no evidence that the panelboard is listed and marked for that exact OCPD combination, using it in a new installation would mean the equipment is not installed per its listed approval, which can create unsafe conditions and violate the listing requirements. The test data and safety assurances provided by the listing apply only to the combinations it covers; without that coverage, you can’t rely on the pairing being safe or permitted. If the manufacturer provides a documented listing/marking that includes the desired combination, then it would be permissible; otherwise, it is not.