diff --git a/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx b/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
index f531f97f..89aa30d7 100644
--- a/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
+++ b/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
@@ -160,6 +160,11 @@ export default function PowerConditionalSelect(props) {
 
       return
     }
+
+    if (selectedModels.find((m) => m.pcsSerParallelYn === 'Y') && selectedRow.pcsSerParallelYn === 'Y') {
+      return
+    }
+
     if (selectedMaker.pcsMkrMultiType === PCS_MKR_MULTI_TYPE.MULTI) {
       setSelectedModels([...selectedModels, { ...selectedRow, id: uuidv4() }])
     } else if (!selectedModels.find((m) => m.itemId === selectedRow.itemId)) {