CreateElectricalSystem

import clr
import sys


# ================ Revit imports
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference("RevitServices")
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager


# ================ GLOBAL VARIABLES
doc = DocumentManager.Instance.CurrentDBDocument

rvt_panel = UnwrapElement(IN[0])
rvt_load = UnwrapElement(IN[1])

element_connectors = rvt_load.MEPModel.ConnectorManager.Connectors
el_sys_type = Electrical.ElectricalSystemType.FireAlarm

TransactionManager.Instance.EnsureInTransaction(doc)

el_sys_list = list()
for connector in element_connectors:
    new_sys = Electrical.ElectricalSystem.Create(
        connector,
        el_sys_type
    )
    new_sys.SelectPanel(rvt_panel)
    el_sys_list.append(new_sys)

TransactionManager.Instance.TransactionTaskDone()

OUT = el_sys_list