600V (1,000V maximum in fixtures and signs). #18 to #10 AWG. Min. 2 #14. Max. 2 #10 w/ 2 #12. Accepts 2 #14 to 4 #12 AWG wire combinations. Rated for 600 Volt maximum. Fixed, square-wire spring. No pre-twisting required. UL Listed and CSA Certified. Reusable. Shell rated for 105C. Flame-retardant shell.