Electrical junction box with built-in isolation transformer
View Patent ↗An electrical junction box with a built-in isolation transformer is provided. The junction box includes an interior base portion having at least one opening, a transformer secured to the interior base portion and in electrical communication with low-voltage and high-voltage terminals, a cover configured to attach to a junction box base plate and housing the interior base I portion and the transformer, and a gasket providing a watertight seal between the cover and the junction box base plate.
1. An electrical junction box, comprising:
a cover removably attachable to a base plate of an existing junction box installation, the cover defining an interior cavity;
a base portion coupled to the base plate, the base portion dividing the interior cavity of the cover to form a high-voltage section and a low-voltage section within the interior cavity of the cover, the high-voltage section isolated from the low-voltage section; and
a transformer positioned within the interior cavity of the cover and mounted to the base portion, the transformer in electrical communication with high-voltage terminals and low-voltage terminals, the high-voltage terminals positioned in the high-voltage section and the low-voltage terminals positioned in the low-voltage section.
2. The electrical junction box of claim 1 , wherein the cover and the base portion have generally rectangular, square, or oval cross-sectional shapes.
3. The electrical junction box of claim 1 , further comprising a second transformer attached to the base portion.
4. The electrical junction box of claim 1 , wherein the base portion further comprises an upper top surface having a first opening and a lower top surface having a second opening, and an inner sidewall connecting the upper and lower top surfaces.
5. The electrical junction box of claim 4 , further comprising low-voltage wires connecting the transformer to the low-voltage terminals and high-voltage wires connecting the transformer to the high-voltage terminals.
6. The electrical junction box of claim 5 , wherein the low-voltage wires extend through the first opening.
7. The electrical junction box of claim 6 , wherein a second set of high-voltage wires extends through the second opening and is in electrical communication with the high-voltage terminals.
8. The electrical junction box of claim 1 , wherein the base portion further comprises one or more stand-offs extending from a lower top surface to a height level with an upper top surface.
9. The electrical junction box of claim 8 , wherein the transformer includes a plurality of mounting tabs, two of the plurality of mounting tabs attached to the stand-offs and two of the plurality of mounting tabs attached to the upper top surface of the base portion.
10. The electrical junction box of claim 1 , further comprising a gasket configured to provide a watertight seal between the cover and the base plate.
11. The electrical junction box of claim 1 , wherein the transformer comprises an isolation step-down transformer for providing low-voltage electrical power to an underwater pool or spa light.
12. The electrical junction box of claim 1 , further comprising an electronic circuit board for controlling a device external to the junction box, the electronic circuit board positioned within the cover.
13. The electrical junction box of claim 1 , further comprising a communications coupler positioned within the cover and in electrical communication with said high-voltage terminals and said low-voltage terminals, said communications coupler transmitting a power line carrier signal from said high voltage terminals to said low voltage terminals for a remote control device exterior to the junction box.
14. The electrical junction box of claim 13 , wherein said communications coupler is positioned within said high-voltage section of said cover.