Conventional distribution transformers are used outdoors or indoors on medium-voltage distribution systems. They are designed to convert medium voltage to low voltage or vice versa. They are typically used for residential service loads and occasionally for light commercial or industrial loads. These transformers are usually designed for pole mounting, although in some cases they are built for installation on certain types of substations. These transformers do not include any protection accessories; therefore, any surge arresters or other overvoltage or overload protection must be provided by the buyer.