GetElementByBuiltInCategory

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

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

reload = IN[0]

doc = DocumentManager.Instance.CurrentDBDocument
uidoc=DocumentManager.Instance.CurrentUIApplication.ActiveUIDocument
uiapp=DocumentManager.Instance.CurrentUIApplication
app = uiapp.Application

outlist = list()
catList = {
    BuiltInCategory.OST_GenericModel,
    BuiltInCategory.OST_FireAlarmDevices,
    BuiltInCategory.OST_DataDevices,
    BuiltInCategory.OST_ElectricalEquipment,
    BuiltInCategory.OST_CommunicationDevices,
    BuiltInCategory.OST_LightingFixtures,
    BuiltInCategory.OST_LightingDevices,
    BuiltInCategory.OST_NurseCallDevices,
    BuiltInCategory.OST_SecurityDevices,
    BuiltInCategory.OST_TelephoneDevices
    }

for bic in catList:
    elems = FilteredElementCollector(doc).OfClass(FamilyInstance).\
                                            OfCategory(bic).ToElements()
    map(lambda x: outlist.append(x), elems)
    outlist.append([bic,elems])

OUT = outlist