Wash. Rev. Code § 19.28.265
(1) A person, firm, partnership, corporation, or other entity and a manufacturer's authorized engineers and factory-trained service technicians it employs are exempt from licensing requirements under RCW 19.28.041, certification requirements under RCW 19.28.161, and inspection requirements under this chapter for the maintenance, repair, or replacement of components and the disconnection and reconnection of existing low voltage digital control system connections within the confines of the manufacturer's industrial equipment. Except for disconnection and reconnection of existing low voltage digital control system connections, this exemption does not include any:
(3) For the purposes of this section, "industrial equipment" means utilization equipment that is:
[ 2020 c 211 s 1.]