Multiple modules are installed, with each module installed in one of multiple outlets to be mapped. A probe is triggered to propagate a signal that provides circuit information at one of multiple circuit interrupts, where the signal is detectable by any of the modules connected by a single circuit to the one circuit interrupt from which the signal is propagated. The circuit information is retrieved from any of the modules that detected the signal as an indication that the modules from which the circuit information is retrieved are connected to the single circuit.