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13 <br />devices and fixtures and electric water heaters shall apply only to work performed by a person <br />licensed under G.S. 87 -43 and exclusions for water heaters, generally, to work performed by a <br />person licensed under G.S. 87 -21. <br />§ 87 -21. Definitions; contractors licensed by Board; examination; posting license, etc. <br />(a) Definitions. — For the purpose of this Article: <br />(11) The phrase "fire sprinkler" means an automatic or manual sprinkler system <br />designed to protect the interior or exterior of a building or structure from fire, <br />and where the primary extinguishing agent is water. These systems include <br />wet pipe and dry pipe systems, preaction systems, water spray systems, foam <br />water sprinkler systems, foam water spray systems, nonfreeze systems, and <br />circulating closed -loop systems. These systems also include the overhead <br />piping, combination standpipes, inside hose connections, thermal systems <br />used in connection with the sprinklers, tanks, and pumps connected to the <br />sprinklers, and controlling valves and devices for actuating an alarm when the <br />system is in operation. This subsection shall not apply to owners of property <br />who are building or improving farm outbuildings. This subsection shall not <br />include water and standpipe systems having no connection with a fire <br />sprinkler system. Nothing herein shall prevent licensed plumbing contractors, <br />utility contractors, or fire sprinkler contractors from installing underground <br />water supplies for fire sprinkler systems. <br />