Extension Arm (Hot Arm) 2.5″ X 60″ Long – 1 Wire Holder. The Epoxiglas® Extension Arm is designed for use on voltages up to and including 15 kV where reconductoring or insulator replacement is necessary. The Epoxiglas® Extension Arm can be used on voltages up to 34.5 kV providing the wire holders are fitted with M4805-7 insulators. The Extension Arm is suspended under the crossarm by brackets to enable to conductor to be removed from the original crossarm and placed in the wire holder mounted on the Epoxiglas® Extension Arm. Extension Arm installed on crossarm.