Tufted, twist pile and bonded carpet fall into the General Domestic category.
Usually, the difference between 'general' and 'heavy' domestic isn't the construction, more-so the gauge or pile weight.
Carpet is categorized into many different labels. General domestic is woven from a weight, in the region of 28oz, up to a weight of, normally, but not explicitly, 50oz. (oz. being the weight of the pile measured in ounces).

General domestic carpet isn't usually recommended for areas of heavy traffic, such as stairs or lounges, more for areas such as bedrooms and occasional rooms i.e. studies, dining rooms.