Aluminum Splicer Reducer 4/0-6 AWG Aluminum Splicer Reducers are used for splicing two copper or aluminum wires of equal or different sizes. Made of 6061T-6 aluminum alloy. Electro-tin plated for low contact resistance. Suitable for use with both copper and aluminum conductors. Rated 600 volts (2000V max. per UL486B). UL 486A/B Listed. Temperature rating 90 degrees C.