Pipe and Rigid Steel Conduit Clamps PS 1100 series pipe clamps are designed for use with standard pipe, rigid metal conduit (RMC), or galvanized rigid conduit (GRC). These clamps are commonly used for trapeze supports, seismic bracing, wall supports, vertical runs, attachment to poles, and general framing needs. For application examples, refer to our Application Showcase. This series is also OPM pre-approved for seismic bracing with load testing in three directions.