7. The provisions of this act shall not apply to:
a. Electrical contractors regulated by the Board of Examiners of Electrical Contractors pursuant to P.L.1962, c.162 (C.45:5A-1 et seq.) and persons in their employ while working on the electrical components of a swimming pool;
b. Plumbing contractors regulated by the State Board of Examiners of Master Plumbers pursuant to P.L.1968, c.362 (C.45:14C-1 et seq.) and persons in their employ while working on the plumbing components of a swimming pool, including the installation of heating circuits connected to building space heating boilers or geothermal heat pumps;
c. HVACR contractors regulated by the State Board of Examiners of Heating, Ventilating, Air Conditioning and Refrigeration Contractors pursuant to P.L.2007, c.211 (C.45:16A-1 et seq.) and persons in their employ while working on the heating components of a swimming pool, including the startup and commissioning of oil, gas, or propane-fired pool heaters, and heat pump pool heaters, and the installation of heating circuits connected to building space heating boilers or geothermal heat pumps ; and
d. A property owner who performs pool and spa building and installation or pool service and repair work on his own pool or spa which is situated on property which holds a residence for himself or for a member or members of his immediate family.