Graybar Electric Co. 550(RCA) Get a print! $8.00 Add to Cart Product Information: Model:550(RCA) Manufacturer:Graybar Electric Co. (Old RCA) Schematic Pages Page 1 Schematics Content Page 1: TERMINAL STRIP VOLTAGES. Please note: we carry a wide range of products which will fulfill the specifications above. Please use our search function or browse our products to find what you need!