In addition, the couplings’ single set-screw inspection cover provides easy access to cables or conductors. The 4256-DC model joins two ½-in. EMT to one ¾-in. EMT, while the 4258-DC model joins two ...

According to Sec. 358.42 of the NEC, couplings and connectors must be made up tight in order to maintain an effective ground-fault current path to safely conduct fault current in accordance with Sec.