Hubbell straight blade isolated ground receptacles uses insulation barrier construction on to isolate the ground contacts from the mounting strap. The green grounding screw is connected directly to the grounding contacts. In this way, ground contacts are separated from the mounting strap and also from the conventional grounding system. The isolated ground circuit is completed by running a dedicated insulated ground wire from the system ground buss to the green grounding screw. Wrap-around, locked on brass mounting strap provides additional support strength for receptacle assembly. Amperage and voltage clearly indicated. Back and side-wiring capability provides easy installation with stranded or solid wire. Dimensionally stable, reinforced thermoplastic polyester provides impact strength in addition to heat and flame resistance. Impact-resistant nylon face. Available in 19 NEMA configurations. With grounding method, isolated ground devices can be mounted in boxes, on metal panels almost anywhere. Every isolated ground device meets and exceeds all applicable codes and standards, plus the toughest standard of all. Isolated ground triangle on the face of the receptacle clearly indicates isolated ground device. Smooth face, back and side wired. NEMA 5-15R.