What does the "CTL" shown on the load center labeling mean for QO or Homeline load centers?
Issue:
Product Design features
Product line:
QO and Homeline load centers
Resolution:
The "CTL" means "Circuit Tandem Limiting". It is a marking required by UL67 on lighting and appliance panelboards. Paragraph 30.8.3 of UL67 states "A Class CTL panelboard designed to permit installation of certain units in specified positions only shall be marked: a) To clearly indicate those positions, and b) With the maximum number of poles that the panelboard is intended to accommodate."
Product Design features
Product line:
QO and Homeline load centers
Resolution:
The "CTL" means "Circuit Tandem Limiting". It is a marking required by UL67 on lighting and appliance panelboards. Paragraph 30.8.3 of UL67 states "A Class CTL panelboard designed to permit installation of certain units in specified positions only shall be marked: a) To clearly indicate those positions, and b) With the maximum number of poles that the panelboard is intended to accommodate."
Released for: Schneider Electric USA
