diff --git a/src/Mod/FreeCADExchange/RoutingNetwork.py b/src/Mod/FreeCADExchange/RoutingNetwork.py
index aabcf90..64216ce 100644
--- a/src/Mod/FreeCADExchange/RoutingNetwork.py
+++ b/src/Mod/FreeCADExchange/RoutingNetwork.py
@@ -423,7 +423,7 @@ def _ensure_integer_property(obj, prop_name, description, value):
         setattr(obj, prop_name, 0)
 
 
-def _set_route_carrier_semantics(obj, project_uuid="", kind=ROUTE_CARRIER_KIND):
+def _set_route_carrier_semantics(obj, project_uuid="", kind=ROUTE_CARRIER_KIND, capacity=1):
     TerminalObjects.ensure_string_property(
         obj,
         "QetRoutingRole",
@@ -456,11 +456,22 @@ def _set_route_carrier_semantics(obj, project_uuid="", kind=ROUTE_CARRIER_KIND):
         obj,
         "QetRouteCarrierCapacity",
         "How many routed wires can reuse this carrier segment before detouring is preferred",
-        1,
+        capacity,
     )
     return obj
 
 
+def _route_carrier_capacity_value(obj, default=1):
+    for property_name in ("QetRouteCarrierCapacity", "QetWireCapacity"):
+        try:
+            value = int(float(getattr(obj, property_name, 0) or 0))
+        except Exception:
+            value = 0
+        if value > 0:
+            return value
+    return int(default or 1)
+
+
 def _set_wire_duct_source_semantics(source):
     if source is None:
         return
@@ -478,6 +489,12 @@ def _set_wire_duct_source_semantics(source):
         "How routing connection collision checks should treat this object",
         WIRE_DUCT_OBSTACLE_MODE,
     )
+    _ensure_integer_property(
+        source,
+        "QetRouteCarrierCapacity",
+        "How many routed wires can reuse generated wire duct segments before detouring is preferred",
+        _route_carrier_capacity_value(source, default=1),
+    )
 
 
 def _set_support_surface_source_semantics(source):
@@ -571,7 +588,7 @@ def _create_carrier_geometry(doc, name, points):
     return obj
 
 
-def create_route_carrier(doc, points, label="", project_uuid="", kind=ROUTE_CARRIER_KIND):
+def create_route_carrier(doc, points, label="", project_uuid="", kind=ROUTE_CARRIER_KIND, capacity=1):
     """Create a routable carrier from ordered 3D points."""
     if doc is None:
         raise RoutingNetworkError("No FreeCAD document is available.")
@@ -596,7 +613,7 @@ def create_route_carrier(doc, points, label="", project_uuid="", kind=ROUTE_CARR
         "Ordered centerline points used by the 3D router",
     )
     carrier.Points = list(normalized)
-    _set_route_carrier_semantics(carrier, project_uuid=project_uuid, kind=kind)
+    _set_route_carrier_semantics(carrier, project_uuid=project_uuid, kind=kind, capacity=capacity)
 
     group = WiringObjects.ensure_carrier_group(doc, project_uuid)
     if carrier not in getattr(group, "Group", []):
@@ -1607,12 +1624,14 @@ def create_wire_duct_carriers_from_document(
         if len(points) < 2:
             continue
         label = getattr(source, "Label", "") or getattr(source, "Name", "") or "Wire Duct"
+        capacity = _route_carrier_capacity_value(source, default=1)
         carrier = create_route_carrier(
             doc,
             points,
             label="QET Auto Wire Duct Centerline {0}".format(label),
             project_uuid=project_uuid,
             kind=ROUTE_CARRIER_KIND_WIRE_DUCT,
+            capacity=capacity,
         )
         _mark_wire_duct_source(source, carrier)
         created.append(carrier)
@@ -1626,6 +1645,7 @@ def create_wire_duct_carriers_from_document(
                     label="QET Auto Wire Duct Open End {0} {1}".format(label, end_index),
                     project_uuid=project_uuid,
                     kind=ROUTE_CARRIER_KIND_WIRE_DUCT_OPEN_END,
+                    capacity=capacity,
                 )
             )
     return created
@@ -1908,12 +1928,14 @@ def create_wire_duct_carriers_from_selection(
         if len(points) < 2:
             continue
         label = getattr(source, "Label", "") or getattr(source, "Name", "") or "Wire Duct"
+        capacity = _route_carrier_capacity_value(source, default=1)
         carrier = create_route_carrier(
             doc,
             points,
             label="QET Wire Duct Centerline {0}".format(label),
             project_uuid=project_uuid,
             kind=ROUTE_CARRIER_KIND_WIRE_DUCT,
+            capacity=capacity,
         )
         _mark_wire_duct_source(source, carrier)
         created.append(carrier)
@@ -1927,6 +1949,7 @@ def create_wire_duct_carriers_from_selection(
                     label="QET Wire Duct Open End {0} {1}".format(label, end_index),
                     project_uuid=project_uuid,
                     kind=ROUTE_CARRIER_KIND_WIRE_DUCT_OPEN_END,
+                    capacity=capacity,
                 )
             )
     return created
diff --git a/tests/python/freecad_exchange_auto_routing_test.py b/tests/python/freecad_exchange_auto_routing_test.py
index 7abd8f9..9205f12 100644
--- a/tests/python/freecad_exchange_auto_routing_test.py
+++ b/tests/python/freecad_exchange_auto_routing_test.py
@@ -1304,6 +1304,25 @@ class AutoRoutingTest(unittest.TestCase):
         self.assertEqual("PassThrough", duct.QetRoutingObstacleMode)
         self.assertEqual([(20.0, 0.0, 15.0), (100.0, 0.0, 15.0)], [(p.x, p.y, p.z) for p in carrier.Points])
 
+    def test_wire_duct_source_capacity_is_copied_to_generated_carriers(self):
+        _install_fake_freecad()
+        terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()
+        doc = FakeDocument()
+        terminal_objects.ensure_root_group(doc, "project-1")
+        duct = doc.addObject("Part::Feature", "WireDuct")
+        duct.Shape = FakeShape(FakeBoundBox(0, 120, -10, 10, 5, 25))
+        duct.QetRouteCarrierCapacity = 4
+
+        created = routing_network.create_wire_duct_carriers_from_selection(
+            doc,
+            [FakeSelectionItem(obj=duct)],
+            project_uuid="project-1",
+            margin=20.0,
+        )
+
+        self.assertIn("QetRouteCarrierCapacity", duct.PropertiesList)
+        self.assertTrue(all(item.QetRouteCarrierCapacity == 4 for item in created))
+
     def test_auto_detect_wire_ducts_ignores_cabinet_models(self):
         _install_fake_freecad()
         terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()