Power/Control Cable, 12/3, XHHW-2, TC-ER, 600V, Non-Shielded

"TC-ER" tray cable stands for "Tray Cable - Exposed Run," meaning it's a type of cable designed to be used in cable trays but can also run exposed for short distances between trays without needing additional conduit protection, as long as it's properly supported; the "ER" rating indicates it meets stricter crush and impact resistance standards compared to regular tray cable, allowing for open runs in certain situations.