Comcast, one of the country’s largest Internet providers, said this week that it would place limits on customers’ broadband usage.

Beginning Oct. 1, Comcast will put a 250 gigabyte-a-month cap on residential users. The limit will not affect most users, at least not in the short-term, but is certain to create tension as some technologies gain traction.

A Comcast spokeswoman, Jennifer Khoury, said 250 gigabytes was about 100 times the typical usage; the average customer uses two to three gigabytes a month. Less than 1 percent of customers exceed the cap, she said.

Many Internet providers reserve the right to cancel the service of the most excessive users. The 250-gigabyte cap is Comcast’s way of specifying a longstanding policy of placing a limit on Internet consumption, and it comes after customer pushed for a definition of excessive use.