This document provides maximum dc steady-state and duration limited voltage@ current@ and power limits to be observed when powering transport systems over conventional network telecommunications twisted-pair conductors. The technical requirements contained herein are based on industry-recognized safety and design standards@ addresses both the network and customer premises environments@ and are independent of the transport system technology employed. Signaling levels and transients are not covered@ but should be considered when evaluating a transport system for conformance to these requirements if they will impact voltage@ current@ or power levels. Purpose The purpose of this document is to provide requirements for the maximum limits for dc steady-state and duration limited voltage@ current@ and power used to operate transport systems over telecommunications twisted-pair conductors that are consistent with industry-accepted electrical safety and design standards and criteria. These requirements are intended to provide a safe and consistent network electrical environment for the telecommunications utility technician@ as well as for the customer and system user who may encounter transport system powering voltages and currents on their premises telecommunications wiring. Additionally@ through informative annexes@ this document is intended to inform the reader regarding pertinent criteria contained in various safety and design standards@ provide accessibility and service personnel work practice recommendations@ and present a brief overview of the physiological effects of electric current on the human body.