public class Propagator 

// Get a NetworkAttribute object for the Phases Normal attribute from the UtilityNetworkDefinition
using (NetworkAttribute normalPhaseAttribute = utilityNetworkDefinition.GetNetworkAttribute("Phases Normal"))
{
  // Create a propagator to propagate the Phases Normal attribute downstream from the source, using a Bitwise And function
  // Allow traversal to continue as long as the Phases Normal value includes any of the ABC phases
  // (represented by the constant ABCPhase)
  Propagator phasePropagator = new Propagator(normalPhaseAttribute, PropagatorFunction.BitwiseAnd, Operator.IncludesAny, ABCPhase);

  // Assign this propagator to our trace configuration
  traceConfiguration.Propagators = new List<Propagator>() { phasePropagator };
}