I got a call from a customer to replace his OH service.The meter is located on a pole out by the street.The existing service is carried to the house on a messenger cable.The service then gets spliced to a SEU to enter the house.My question is about the type of insulation on the conductors used w/ the messenger cable to bring the service to house.I'm looking at table 310.20. I'd like to know if there is one type (THHN,XHHW etc.)that is used more often than others. Also the Temp rating of 75 or 90.Any info is greatly appreciated....Thanks ToHo