W30 - For common connection of two, three or four No. 12 or No. 14 solid copper conductors. Packed 24 pieces per carton (16 W30 and 8 W30G). W30G - For connection of equipment grounding of 2, 3, or 4 solid conductors No. 14 or No. 12 AWG. 300V maximum. 20A 105 degrees C maximum. NOTE: Not for use with aluminum conductors.