Working with chains

Tools
1

Good afternoon, how can I enter the circuit numbers into the parameter I need?

Circuit
Circuit723×319 58 KB

2

pyreviters,tell me,please, is the logic of the code correct? first we must get the elements of the circuit numbers and then set the values ​​in our desired parameter.

circuit number
circuit number637×668 43.8 KB

3

Just for the sake of sharing, as the conversation took place in private message, Here is one solution.

# -*- coding: UTF-8 -*-
from pyrevit import revit, DB
from pyrevit.revit.selection import pick_elements_by_category

doc = revit.doc
uidoc = revit.uidoc

selection = pick_elements_by_category(DB.BuiltInCategory.OST_ElectricalEquipment, 'Pick electrical equipment')

def getSystem(e):
    equipment_system = []
    try:
        system = e.MEPModel.AssignedElectricalSystems # here the e variable was not there
        if system:
            for sys in system:
                equipment_system.append(sys.Name)
            return ",".join(equipment_system)
        else:
            pass
    except:
        pass

def SetValueToElementParameterByName(e, en, ev):
    params = e.Parameters
    for param in params:
        if param.Definition.Name == en:
            try:
                param.Set(ev)
                print('Parameter set to {}'.format(ev))
            except:
                print("no circuit name")

with revit.Transaction("circuit name to element param"):
    for element in selection:
        try:
            system = getSystem(element)
            if system:
                SetValueToElementParameterByName(element, "my_param", system) # here the parameter name is 'my_param'
            else:
                pass
        except:
            pass