a modular electrical wiring component comprises a wiring module having a wiring portion for coupling to a source of electrical power and a user - accessible portion configured to accept and provide electrical power to a functional module that provides a selected electrical distribution function , wherein the wiring module is configured to accept the functional module without access to the wiring portion . the modular electrical wiring component also comprises an adjustable plaster ring configured to couple to the wiring module and to an electrical junction box , wherein the adjustable plaster ring provides a variable distance between the electrical junction box and the wiring module .