REQUIRED LABEL; EXCEPTIONS.

(a) Except as provided by Subsections (b) and (c), a detection or alarm device, alarm system, or item of monitoring equipment, a purpose of which is to detect or give alarm of fire, may not be sold, offered for sale, leased, installed, or used to monitor property in this state unless the device, system, or item of equipment carries a label of approval or listing of a testing laboratory approved by the department.

(b) Except as provided by Subsection (c), a detection or alarm device, alarm system, or item of monitoring equipment in a one-family or two-family residence, a purpose of which is to detect or give alarm of fire, may not be sold, offered for sale, leased, installed, or used to monitor property in this state after April 14, 1989, unless the device, system, or equipment carries a label of approval or listing of a testing laboratory approved by the department.

(c) Subsections (a) and (b) do not prohibit the continued use or monitoring of equipment in place if the equipment:

(1) complied with the law applicable on the date of the equipment's original placement; and

(2) has not been extended, modified, or altered.

(d) Fire alarm devices that are not required by this chapter or rules adopted under this chapter and that do not impair the operation of fire alarm or fire detection devices required by this chapter or the rules adopted under this chapter are exempt from the label and listing requirements described by Subsections (a) and (b) if the devices are approved by the local authority with jurisdiction.