Reliance Controls Corporation PB50 50-Amp NEMA 3R Power Inlet Box, 50-Amp for Generators Up to 12,500 Running Watts For indoor or outdoor use with specific transfer switches, manual transfer panels and generator-ready load centers Outdoor, raintight NEMA 3R non-metallic power inlet box Maximum generator running watts: 12,500 Maximum generator input: 50A@125/250VAC Intended for use with 8 AWG 75 degrees C insulated wire