610.13 Exceptions.

The provisions of this section relative to the size of water piping shall not apply to the following: (1) Water supply piping systems designed in accordance

with recognized engineering procedures acceptable to the Authority Having Jurisdiction. (2) Alteration of or minor additions to existing installations

provided the Authority Having Jurisdiction finds that there will be an adequate supply of water to operate fixtures. (3) Replacement of existing fixtures or appliances. (4) Piping that is part of fixture equipment. (5) Unusual conditions where, in the judgment of the

Authority Having Jurisdiction, an adequate supply of water is provided to operate fixtures and equipment. (6) The size and material of irrigation water piping installed

outside of a building or structure and separated from the potable water supply by means of an approved air gap or backflow prevention device are not regulated by this code. The potable water piping system supplying each such irrigation system shall be adequately sized as required elsewhere in this chapter to deliver the full connected demand of both the domestic use and the irrigation systems.