Underground conduit size

Hello. My existing Comcast service is an overhead cable and I am having new underground conduit(s) installed for a new service line to replace the overhead, plus a new service line serving an accessory dwelling unit that will be billed separately. Does Comcast/Xfinity have a minimum diameter preference for buried conduit for single-family residential? Run length is approximately 80 ft with <170 degrees of bends. Location is King County, Washington.